Maryland Planting Guide: What to Grow and When
A complete Maryland planting guide covering USDA zones 5b–7b, frost dates by city, a month-by-month planting calendar, and the best vegetables, fruits, and ornamentals for Western Maryland mountains, the Central Piedmont, and the Eastern Shore.
Maryland sits in a genuinely interesting position on the American gardening map. The state spans three distinct growing regions that behave almost nothing alike: the cool Appalachian highlands of Garrett County, where last frosts can linger into mid-May; the broad Central Piedmont where Baltimore and Frederick gardeners work with a comfortable two-hundred-day season; and the Eastern Shore, where the combined influence of the Chesapeake Bay and the Atlantic coastal plain produces the mildest winters in the state. A gardener in Oakland, Maryland and a gardener in Ocean City are working in climates more different from each other than many adjacent US states.
This Maryland planting guide covers all three regions with specific frost dates by city, a month-by-month planting calendar, and the plants that consistently perform across the state’s varied conditions. Maryland’s humid subtropical and humid continental climate means gardeners deal with both summer heat and humidity and, in the west, genuine cold winters that demand cold-hardy variety choices. Getting the timing right is the single most important factor in Maryland vegetable and flower gardening.
One framing that helps: Maryland is a transition state. The state’s northern tier and western highlands garden more like Pennsylvania and New England, while the Eastern Shore and southern coastal areas garden more like Virginia and North Carolina. Knowing which side of that divide your garden sits on shapes every planting decision that follows.
Maryland’s Climate Zones: Three Regions That Matter
Maryland spans USDA hardiness zones 5b through 7b, a range significant enough that variety selection and timing must be matched to your specific region. Before any planting calendar makes sense, you need to know which Maryland you’re gardening in.
Three distinct gardening regions define Maryland’s growing conditions:
- Western Maryland / Appalachian Highlands (Garrett County, Allegany County) — Zones 5b–6a. Garrett County is the coldest county in Maryland, with elevations reaching above 3,000 feet in places. Last frosts commonly persist into May, first fall frosts arrive in early October, and the frost-free growing season runs only 140–160 days. Short-season varieties are not optional here — they are the baseline requirement.
- Central Piedmont and Greater Baltimore (Frederick, Hagerstown, Baltimore, Annapolis, Washington suburbs) — Zones 6b–7a. This is where most Maryland gardeners live and the region that standard Mid-Atlantic gardening advice targets. Last frosts fall between mid-April and early May depending on elevation, the frost-free season runs 185–210 days, and both warm-season and cool-season crops perform reliably.
- Eastern Shore and Southern Coastal Plain (Salisbury, Easton, Cambridge, Ocean City, Southern Maryland) — Zones 7a–7b. The Chesapeake Bay’s thermal mass and proximity to the Atlantic moderate temperatures year-round. Last frosts occur in early April or earlier in zone 7b locations, the frost-free season extends past 215 days, and mild winters allow overwintering of crops and perennials that would die back in Western Maryland. As USDA zones continue shifting northward, the Eastern Shore is already seeing plant communities that were historically found further south along the Delmarva Peninsula.
The Chesapeake Bay watershed also creates a characteristic Maryland gardening challenge: high summer humidity that drives fungal disease pressure unlike anything gardeners in drier climates face. Powdery mildew, early and late blight on tomatoes, and black spot on roses are facts of life for Maryland gardeners from June through September, and variety selection and air circulation matter enormously.
Maryland Frost Dates by City
Last spring frost and first fall frost dates define the outdoor window for frost-sensitive crops. University of Maryland Extension historical data and NOAA climate normals provide the basis for the city-level estimates below; dates use 50% probability thresholds for planning and should be treated as starting points rather than guarantees. A week of unseasonably warm or cold weather can shift these windows noticeably in any given year.
| City / Region | Zone | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|---|
| Oakland / Garrett County | 5b–6a | May 10–20 | October 1–10 | ~145 |
| Cumberland / Frostburg | 6a | May 1–10 | October 10–15 | ~155 |
| Hagerstown | 6b | April 20–30 | October 15–25 | ~175 |
| Frederick | 6b–7a | April 15–25 | October 20–30 | ~185 |
| Baltimore / Towson | 7a | April 10–20 | October 25–November 5 | ~200 |
| Annapolis / Bowie | 7a | April 10–15 | November 1–10 | ~205 |
| Easton / Cambridge (Eastern Shore) | 7a–7b | April 1–10 | November 10–15 | ~215 |
| Salisbury | 7b | March 25–April 5 | November 15–20 | ~225 |
| Ocean City / Lower Shore | 7b | March 20–30 | November 20–25 | ~235 |
Source: University of Maryland Extension climate data and NOAA climate normals. Dates indicate 50% frost probability. For frost-sensitive transplants in marginal periods, monitor your local 10-day forecast.
Western Maryland gardeners face an important planning reality: in Oakland and Garrett County, the effective warm-season window for crops like tomatoes and peppers is often closer to 100–120 days once soil warming is factored in alongside air temperature. Fast-maturing varieties — tomatoes under 70 days, peppers under 75 days, squash under 55 days — are not just helpful here but genuinely necessary to guarantee harvest before the first October frosts.
Spring Planting in Maryland
Spring in Maryland follows a staggered start that runs from late February in the Eastern Shore to late May in the Garrett County highlands. The Central Piedmont — where most Maryland gardeners garden — works with a mid-March to mid-May window for the transition from cool-season to warm-season planting.
February–March: Cool-Season Crops and Indoor Starts
February is not too early to be active in most of Maryland. While no frost-sensitive crops can go outside yet, February is the right time to start warm-season transplants indoors and get the earliest cool-season crops in the ground in Central Piedmont and Eastern Shore gardens.
- Start tomatoes and peppers indoors 6–8 weeks before your last frost date. For Baltimore and Frederick gardeners with an April 15–25 last frost, this means starting indoors between late February and early March. Eggplant should go in with or slightly before tomatoes, as it needs 8–10 weeks to develop.
- Direct sow cool-season crops outdoors from late February in zones 7a–7b (Eastern Shore, Annapolis, Baltimore): spinach, arugula, claytonia, miner’s lettuce, and radishes can all tolerate soil temperatures of 40°F and handle light frosts without protection. In Central Piedmont zones 6b–7a, wait until early to mid-March and use a cold frame or row cover for the earliest sowings.
- Start broccoli, cauliflower, cabbage, and kale transplants indoors 4–6 weeks before outdoor transplanting date. These cool-season brassicas want to go outside while nights are still cold; transplanting them 3–4 weeks before the last frost date produces heads before summer heat arrives.
- Plant peas outdoors from St. Patrick’s Day (March 17) in Central Piedmont gardens — this is the traditional Maryland and Pennsylvania planting date for peas, and it works. Eastern Shore gardeners can plant peas 2–3 weeks earlier. Western Maryland gardeners should wait until early April or start under cover in late March.
April: The Main Spring Window Opens
April is the most active spring planting month for Maryland’s Central Piedmont gardeners. Cool-season crops reach full swing, and the tail end of the month opens transplanting windows for warm-season crops in the warmer zones.
- Transplant broccoli, cauliflower, and cabbage outdoors 2–4 weeks before last frost, or roughly early to mid-April for Central Piedmont gardens. These crops tolerate temperatures down to 28°F and benefit from the cool spring weather that helps them size up heads before heat arrives in June.
- Direct sow lettuce, chard, beets, carrots, and turnips outdoors throughout April. Succession sow lettuce every two weeks for continuous harvests through late May before heat forces bolting.
- Set out onion sets or transplants in early April. Maryland onion growers should use intermediate-day or short-day varieties (Candy, Yellow Granex, Red Candy Apple) in the warmer eastern zones and long-day varieties (Walla Walla, Yellow Sweet Spanish) in Western Maryland, where the longer summer days match long-day variety requirements.
- In zones 7a–7b (Eastern Shore and southern Maryland), tomato transplants can go outside from late April after monitoring nighttime temperatures. Experienced Eastern Shore gardeners often push transplants outside by April 20–25 with fleece protection available for any unexpected cold snap.
May: Warm-Season Planting in Full Swing
May is when Central Piedmont and Western Maryland gardeners make their main warm-season plantings. The frost risk finally recedes and soil temperatures warm enough to support rapid germination and establishment.
- After your last frost date, transplant tomatoes, peppers, eggplant, cucumbers, squash, and basil outdoors. Wait for soil temperatures to reach at least 60°F before planting warm-season crops — cold soil stunts growth and can cause transplant shock that sets plants back by weeks.
- Direct sow beans, cucumbers, summer squash, and zucchini once soil is consistently warm. These crops germinate poorly in soil below 60°F and are better planted directly rather than transplanted. In Central Piedmont gardens, mid-May is typically safe for direct sowing of these crops.
- Plant sweet corn in blocks of at least four rows for adequate pollination. Maryland’s humid summers suit corn well once the season gets established. Successive plantings two weeks apart extend the harvest window through August.
- Western Maryland and Garrett County gardeners transplant all warm-season crops after their May 10–20 last frost date. Use black plastic mulch over beds to warm soil faster, and have row cover available for any late cold snaps that remain possible through Memorial Day at higher elevations in Garrett County.
- Practicing companion planting techniques becomes especially valuable in Maryland’s humid summer climate: planting basil near tomatoes, dill near brassicas, and marigolds throughout the vegetable garden helps manage the pest and disease pressure that Maryland’s warm, humid summers bring.
Maryland Summers: Heat, Humidity, and Managing Disease
Maryland summers are warm but not brutally hot by national standards — Baltimore averages around 89°F in July, Frederick and the western suburbs push slightly higher, and the Eastern Shore benefits from sea breezes that moderate peak temperatures. What Maryland summers lack in extreme heat they make up for in humidity: average July relative humidity in Baltimore approaches 70%, and the combination of 85°F temperatures with 70% humidity creates serious fungal disease pressure that gardeners in drier climates rarely face.
The practical implication: Maryland vegetable gardeners need a disease management strategy, not just a watering schedule. Powdery mildew on squash and cucumbers, early blight and Septoria leaf spot on tomatoes, and downy mildew on basil are annual occurrences in most Maryland gardens. Three practices make the biggest difference: spacing plants generously to maximize airflow, watering at the soil level (never on foliage), and selecting disease-resistant varieties when available.
What Thrives Through Maryland Summers
Maryland’s summers are productive for warm-season crops with the right management:
- Tomatoes produce prolifically through June and July; blossom drop occurs above 95°F but Maryland rarely sustains such temperatures for extended periods. Choose disease-resistant varieties (Mountain Merit, Defiant, Jasper cherry) that handle the region’s fungal disease pressure.
- Peppers and eggplant hit their stride in July and August once the heat accumulates. Both are heat-lovers that Maryland summers genuinely suit; they continue producing well into September without the disease problems that afflict tomatoes.
- Sweet corn is a Maryland summer staple, growing vigorously in the state’s humid heat. Direct sowing in blocks through mid-June produces successive harvests from late July through August.
- Sweet potatoes thrive in Maryland’s long, warm summer. Slips planted in late May or early June produce large yields by October harvest. Maryland’s growing season is long enough to develop properly cured sweet potatoes with excellent flavor.
- Basil loves Maryland summers but is highly susceptible to basil downy mildew, which arrived in the Mid-Atlantic region around 2007. Grow resistant varieties like Amazel, Rutgers Devotion, or Obsession DMR to avoid losing plants in July and August.
Beat the Japanese Beetles
Japanese beetles are the defining summer pest challenge of Maryland gardening. The state is within the beetle’s core distribution range in the eastern US, and emergence from mid-June through mid-August can be dramatic. They skeletonize rose foliage, eat corn silk (preventing kernel development), and damage beans, raspberries, and dozens of ornamentals. Hand-picking into soapy water in the early morning while beetles are sluggish is the most effective control method for vegetable gardens; neem oil applications protect vulnerable plants during peak emergence weeks. Avoid pheromone traps, which attract more beetles to your yard than they catch.
Fall Planting in Maryland: The Second Season
Fall is Maryland’s second major productive season and, for cool-season crops especially, often the most reliable. Crops like kale, broccoli, and Brussels sprouts planted in late summer and grown through October and November develop fuller flavor as temperatures cool — fall-harvested kale after a light frost tastes dramatically sweeter than spring-harvested kale that met summer heat halfway through its development. This is a fact experienced Maryland gardeners know well and beginning gardeners discover with genuine surprise.
The Maryland fall season runs significantly later than many gardeners expect. Baltimore can see productive outdoor vegetable growing well into November in mild years; the Eastern Shore’s first frosts typically don’t arrive until mid-to-late November. Planning a full fall succession from late July through October is not only possible but genuinely rewarding. Review strategies for timing your seasonal transitions in our guide to year-round planting across US growing seasons.
July–August: Starting the Fall Garden
The key to a productive Maryland fall vegetable garden is counting backwards from your expected first fall frost date. Most cool-season crops need 50–80 days to reach harvest maturity, so working backwards from an October 25–November 1 first frost date in Central Piedmont gardens means starting fall crops in late July and August.
- Start broccoli, cauliflower, Brussels sprouts, and cabbage transplants indoors from late July. These brassicas need 4–6 weeks of indoor growing time before outdoor transplanting in late August or early September. Transplanting in the heat of August is challenging; harden off thoroughly and water daily until established.
- Direct sow kale, Swiss chard, and collards outdoors from late July through mid-August. These are among the most heat-tolerant cool-season crops and can be sown directly even in warm summer soil. Germination is rapid in summer temperatures; thin seedlings to 12 inches apart as they develop.
- In Western Maryland, start fall crops in early-to-mid July given the earlier first frost dates. Garrett County gardeners working against an October 1–10 first frost must have fall brassicas transplanted by mid-August at the latest.
September–October: Peak Fall Season
- Direct sow spinach, arugula, lettuce, radishes, turnips, and Asian greens from early September. These fast-growing cool-season crops germinate readily in September’s soil temperatures and produce harvests before frost in Central Piedmont gardens. In zones 7a–7b, succession sowing through mid-October remains productive under row cover.
- Sow garlic from mid-October through early November. This is one of Maryland’s most satisfying fall plantings: garlic goes in just as the season winds down and overwinters in the soil, producing harvest the following June. University of Maryland Extension recommends hardneck varieties (Rocambole, Porcelain, Purple Stripe types) for Maryland’s climate; they are better adapted to the state’s cold winters than softneck types and develop more complex flavor.
- Plant spring-blooming bulbs (tulips, daffodils, hyacinths, alliums, crocuses) from mid-October through November, or until the ground freezes. Maryland’s winters provide sufficient cold vernalization naturally for all of these; no pre-chilling is required.
- Harvest sweet potatoes after the first light frost blackens the foliage or by late October at the latest. Cure freshly dug sweet potatoes at 80–85°F with high humidity for 7–10 days before storage to convert starches to sugars and heal skin damage.
Winter Gardening in Maryland
Maryland winters are cold enough to end most outdoor vegetable growing in the Central Piedmont and Western regions, but milder than what gardeners north of the Mason-Dixon line typically face. Eastern Shore and southern Maryland gardeners in zones 7a–7b can extend the season significantly with modest protection.
- Cold frames and low tunnels with row cover can keep spinach, kale, claytonia, miner’s lettuce, and even loose-leaf lettuce growing through December in Central Piedmont gardens and into January in Eastern Shore zones 7a–7b. These low-investment structures buffer plants against frost without heating requirements.
- Overwintering garlic and cover crops are the main winter activity for Central Piedmont and Western Maryland gardeners. Winter rye, hairy vetch, and crimson clover sown in September protect soil from erosion, add organic matter, and fix nitrogen for the following spring.
- Eastern Shore gardeners in zone 7b can often overwinter cold-hardy vegetables in unprotected beds: kale, Brussels sprouts, and spinach can survive light frosts without any protection and continue producing through November and into mild December spells.
- January and February are planning and seed-ordering months for most Maryland gardeners. Start tomatoes and peppers indoors under lights from late February onward, following the 6–8 week lead time before the spring outdoor transplanting window.
Maryland Month-by-Month Planting Calendar
This calendar uses three reference zones aligned with Maryland’s main gardening regions: Western Maryland (Garrett County/Cumberland, zones 5b–6a), Central Piedmont (Baltimore/Frederick, zones 6b–7a), and Eastern Shore/Coastal (Salisbury/Annapolis, zones 7a–7b).
| Month | Western Maryland (Zones 5b–6a) | Central Piedmont (Zones 6b–7a) | Eastern Shore / Coastal (Zones 7a–7b) |
|---|---|---|---|
| January | Plan and order seeds; source short-season varieties from specialty suppliers; start seeds under lights late January | Plan spring garden; order seeds; start cool-season brassica transplants indoors mid-to-late January | Harvest kale and cold-hardy greens from cold frames; start broccoli and cabbage transplants indoors |
| February | Start tomatoes and peppers indoors early February (8 weeks before May last frost); start brassica transplants under lights | Start tomatoes and peppers indoors late February; sow brassica transplants; prepare raised beds | Direct sow cool-season crops outdoors late February (spinach, arugula, radishes, miner’s lettuce); start warm-season transplants indoors |
| March | Continue indoor starts; direct sow cool-season crops under cold frame; order bare-root fruit trees while dormant | Plant peas outdoors mid-March; transplant brassicas under fleece; direct sow spinach, arugula, lettuce outdoors late March | Full cool-season planting in swing; transplant brassicas; plant peas, onions, and garlic (if missed in fall); plant bare-root fruit trees |
| April | Direct sow cool-season crops outdoors; transplant brassicas after mid-April; start cucurbit transplants indoors | Direct sow beets, carrots, chard, turnips; succession sow lettuce every 2 weeks; transplant brassicas early April; tomatoes and peppers outdoors late April in sheltered spots | Tomatoes, peppers outdoors mid-to-late April after last frost; direct sow beans, cucumbers, squash late April; plant onion sets |
| May | After last frost (May 10–20): transplant all warm-season crops; direct sow beans, corn, squash, cucumbers; use black plastic mulch to warm soil | Full warm-season planting after last frost (April 15–25); direct sow beans, corn, cucumbers, summer squash mid-May; plant sweet potato slips late May | Plant sweet potato slips; succession sow beans and corn; plant annual flowers; thin earlier direct-sown crops |
| June | Warm-season garden in full swing; succession sow beans; monitor for late cold (rare); Japanese beetles begin emerging mid-June | Summer garden established; direct sow second planting of corn and beans; start fall brassica transplants indoors late June; Japanese beetles emerge | Harvest spring crops; start fall brassica transplants indoors; succession sow heat-tolerant lettuce for summer use; manage Japanese beetles |
| July | Harvest summer crops; start fall brassica transplants early July (8 weeks before October 1 first frost); direct sow kale and chard late July | Start fall brassica transplants indoors late July; direct sow kale, chard, collards outdoors late July; harvest tomatoes and summer vegetables | Full summer harvest; start fall brassicas; direct sow fall crops including chard, kale, beans for fall; manage fungal diseases in humidity |
| August | Transplant fall brassicas early August; direct sow fast cool-season crops (spinach, radishes, lettuce) by mid-August; prepare garlic beds | Transplant fall broccoli, cauliflower, Brussels sprouts outdoors; direct sow spinach, arugula, lettuce; prepare garlic bed | Full fall planting; transplant fall brassicas; direct sow all cool-season crops through August; second planting of beans for fall harvest |
| September | Direct sow hardy greens (spinach, claytonia) before first frost; plant garlic mid-to-late September; harvest summer crops before frost | Peak fall planting; direct sow all cool-season crops; plant garlic mid-to-late October; harvest and preserve summer crops | Full cool-season harvest underway; succession sow fast greens through mid-September; plant garlic; harvest summer crops; plant spring bulbs |
| October | First frost arrives; harvest remaining summer crops; plant garlic before ground freezes; mulch perennials; clean beds | Plant garlic and spring bulbs; harvest root crops and fall brassicas; extend season with row cover on cold nights; last succession sowing under cover | Continue cool-season planting and harvest; plant garlic and bulbs; harvest sweet potatoes; use low tunnels to extend production |
| November | Beds mulched and dormant; store root vegetables; record what worked for next year; begin indoor planning | Cool-season crops producing under row cover; harvest kale and Brussels sprouts after frosts (flavor improves); prepare beds for winter | Cool-season production continues outdoors in zone 7b; harvest kale, spinach, Brussels sprouts; plant last garlic spots; cover tender herbs |
| December | Full dormancy; plan next year; order seeds; start cool-season transplants under lights very late December | Order seeds; plan rotations; kale may continue in cold frames; start broccoli transplants under lights mid-December | Harvest cold-hardy greens through cold frames; plan spring garden; order seeds; start brassica transplants indoors late December |
Top Plants for Maryland Gardens
Maryland’s combination of humid summers, cold winters in the west, and moderate conditions in the Central Piedmont and Eastern Shore suits a wide range of crops. The table below covers the most reliable performers across Maryland’s regions, with specific variety recommendations that match the state’s disease pressure and climate range.
| Plant | Best Varieties for Maryland | Season | Region | Key Notes |
|---|---|---|---|---|
| Tomato | Mountain Merit, Defiant PhR, Celebrity, Jasper (cherry) | Summer | All | Disease resistance is critical in Maryland’s humid summers; Mountain Merit and Defiant resist late blight specifically |
| Pepper | Carmen, King of the North (for Western MD), Keystone Resistant Giant | Summer | All | King of the North is the best choice for short-season Western Maryland gardens; Carmen excels in Central Piedmont and Eastern Shore |
| Kale | Lacinato (Dino), Red Russian, Winterbor | Spring & Fall–Winter | All | Most productive and flavorful in fall; Winterbor is exceptionally cold-hardy and overwinters in zones 6b+ with protection |
| Broccoli | Belstar, Arcadia, Diplomat, Bay Meadows | Spring & Fall | All | Fall crop consistently outperforms spring in Maryland; transplant for fall in late August for October–November harvest |
| Lettuce | Black-Seeded Simpson, Buttercrunch, Batavian Red, Jericho | Spring & Fall | All | Succession sow every 2 weeks; Jericho and Batavian types handle brief heat spells without immediate bolting |
| Garlic | Music, Chesnok Red, Siberian (Rocambole/Porcelain hardneck) | Fall planting, June harvest | All | Hardneck varieties suited to Maryland’s cold winters; plant October–November, harvest June; store cured bulbs in cool dry location |
| Sweet Potato | Beauregard, Covington, Vardaman | Summer–Fall | Central & Eastern | Excellent Maryland crop; plant slips after last frost; harvest after first frost blackens vines; cure at 85°F for 10 days |
| Black-Eyed Susan | Goldsturm, American Gold Rush, Viette’s Little Suzy | Summer–Fall perennial | All | Maryland’s state flower; drought-tolerant once established; attracts native pollinators; naturalizes readily in Maryland gardens |
| Basil | Amazel, Rutgers Devotion DMR, Obsession DMR | Summer | All | DMR varieties resist basil downy mildew, which has devastated non-resistant basil in Maryland since 2007 |
| Cucumber | Marketmore 97, Straight Eight, Spacemaster, Diva | Summer | All | Marketmore 97 resists cucumber mosaic virus and scab; Diva is parthenocarpic (no pollination needed) and resistant to bitterness |
| Strawberry | Earliglow, Allstar, Honeoye, Chandler (Eastern Shore) | Spring harvest, perennial | All | Earliglow is the best-flavored June-bearer for Maryland; Chandler performs best in the milder Eastern Shore zones |
| Apple | Liberty, Pristine, Gold Rush, Enterprise | Fall harvest | All | Scab and fire blight resistance essential in Maryland’s humid climate; Maryland is prime apple country; Frederick and Washington County have extensive orchard history |
| Peony | Sarah Bernhardt, Festiva Maxima, Coral Charm | Late spring perennial | All | Thrives in Maryland’s cold winters that provide necessary chilling; divide and replant in September; deer-resistant once established |
| Coneflower (Echinacea) | Magnus, Pow Wow White, Prairie Splendor | Summer perennial | All | Extremely Maryland-adapted native; drought-tolerant; attracts goldfinches to seed heads in fall; spreads slowly by self-seeding |
| Witch Hazel | Arnold Promise, Jelena, Diane | Winter–Spring perennial | All | Blooms January–February in mild Maryland winters; native Maryland species (Hamamelis virginiana) blooms fall; Arnold Promise is most dramatic in Central Piedmont gardens |
Common Maryland Gardening Challenges
Deer Pressure
Deer are the single most commonly cited gardening frustration across Maryland. The state’s large deer population, suburban expansion into deer habitat, and mild winters that maintain herd sizes mean that most Maryland vegetable and flower gardens need some form of deer management. A 7–8 foot perimeter fence is the only reliable solution for vegetable gardens; for ornamentals, selecting deer-resistant plants (ornamental grasses, Russian sage, catmint, black-eyed Susans, daffodils, foxgloves, lavender) removes the problem entirely for low-maintenance areas. Deer repellent sprays work short-term but require consistent reapplication and lose effectiveness during high-pressure periods like late winter when natural food is scarce.
Stop missing your zone's planting windows.
Select your US zone and month — get a complete checklist of what to plant, prune, feed, and protect right now.
→ View My Garden CalendarClay Soil and Drainage
Maryland’s Piedmont region sits on heavy clay subsoil in many areas, particularly in Howard, Montgomery, Prince George’s, and Baltimore counties. Clay soil retains moisture in wet springs, becomes compacted under foot traffic, and drains poorly — conditions that cause root rot in poorly placed plants and make working the soil in wet conditions counterproductive. The solution that works consistently: raise beds 6–12 inches above grade with a mix of topsoil, compost, and coarse sand, and never till when soil is wet enough to form a ball that holds its shape. Over several years, generous annual compost additions improve drainage and soil structure substantially in clay-based gardens.
Spotted Lanternfly
Spotted lanternfly, established in Maryland since 2018, is now present in most Maryland counties and represents a genuine threat to grape vines, hops, fruit trees, and ornamental trees like tree of heaven, maple, and willow. The pest’s egg masses (tan, putty-like patches on hard surfaces) can be scraped and destroyed from September through June. Adults are present July through December and should be killed on sight. University of Maryland Extension recommends reporting sightings and checking vehicles before traveling out of infested counties, as the insect spreads primarily through egg masses carried on vehicles and outdoor equipment.
Frequently Asked Questions About Maryland Gardening
When should I plant tomatoes in Maryland?
For most Central Piedmont Maryland gardens (Baltimore, Frederick, Annapolis area), the safe transplant date for tomatoes is after May 10–15, following the average last frost of April 15–25. Eastern Shore and southern Maryland gardeners in zones 7a–7b can transplant from late April with frost cloth available for any unexpected cold snaps. Western Maryland and Garrett County gardeners should wait until May 20–Memorial Day weekend before transplanting frost-sensitive warm-season crops. Start tomato transplants indoors 6–8 weeks before your outdoor transplanting date.
What vegetables grow well in Maryland summers?
Tomatoes, peppers, eggplant, sweet corn, sweet potatoes, cucumbers, summer squash, and green beans all perform well in Maryland’s warm, humid summers. The key to summer success is choosing disease-resistant varieties — especially for tomatoes (Mountain Merit, Defiant) and basil (Amazel, Rutgers Devotion DMR) — and spacing plants generously to allow airflow that reduces fungal disease pressure in Maryland’s humid conditions.
When do I plant garlic in Maryland?
Plant garlic in Maryland from mid-October through early November, once soil temperatures have dropped below 50°F but before the ground freezes. Hardneck varieties (Music, Chesnok Red, Rocambole types) are better suited to Maryland’s cold winters than softneck varieties and develop superior flavor. Plant cloves 2 inches deep and 6 inches apart, pointed end up, in beds amended with compost. Mulch with 3–4 inches of straw after planting. Harvest the following June when lower leaves begin yellowing but before all leaves brown.
What are the best native plants for Maryland gardens?
Black-eyed Susan (Maryland’s state flower), purple coneflower, Joe-pye weed, native witch hazel, cardinal flower, Virginia bluebells, and wild blue indigo are all excellent native Maryland plants that provide wildlife habitat, require minimal maintenance once established, and are well-adapted to the state’s humidity and rainfall patterns. University of Maryland Extension’s Maryland Native Plant Society resources are an excellent guide to regional native plant selection by county and habitat type.
