What to Plant in June: Succession Sowing for Summer Salads and Autumn Brassicas
June is the transition from planting to managing — but there is still plenty to sow. Zone-by-zone guide to succession sowing, biennial flowers, summer bulbs, dahlia pinching, and every garden task that June demands.
June marks a turning point in the growing season. For most US gardeners, the frantic rush of spring planting — starting seeds, hardening off transplants, racing to beat the last frost — is finally over. Tender crops are in the ground. The beds are full. But June is not a month to sit back. It is the beginning of the transition from planting to managing, and if you understand what June actually demands of the garden, you will be harvesting and blooming well into autumn.
The mistake most gardeners make in June is assuming the planting season is done. In reality, some of the most valuable sowings of the year happen right now: succession sowings of salad crops that prevent an August gap, biennial flowers sown now that will anchor next year’s garden, and a second wave of summer bulbs and annuals that extend colour deep into fall. This guide covers every sowing and planting task that June demands, zone by zone, with the specific timing, varieties, and techniques that make the difference between a productive late summer and a garden that peaks in July and then goes quiet. For a complete picture of what to sow each month of the year, see our year-round planting guide.
Zone-by-Zone June Planting Overview
June looks completely different depending on where you garden. The USDA hardiness zone system gives the broad picture, but in June what matters most is where you are relative to your last frost date and how quickly your summer heat arrives. Use this table as your starting framework before diving into the specific tasks below.
| USDA Zone | Typical June Conditions | Key June Tasks |
|---|---|---|
| Zone 3–4 (MN, ND, northern ME, high-elevation WY/CO) | Last frost may fall mid-May to early June; soil still warming. Summer is short — 90 to 120 frost-free days. | Still transplanting tender crops outdoors; direct sow warm-season crops urgently; no time for succession — get everything in now |
| Zone 5–6 (most of the Midwest, Mid-Atlantic, New England) | Last frost safely past by late May; long productive summer ahead. Soil warm and workable. | Succession sowing salads, beans, radishes; biennial flower sowing; summer bulb planting; beginning pest management |
| Zone 7–8 (VA, NC, TN, OR coast, Pacific NW lowlands, parts of CA) | Summer heat building; soil temperatures may reach 85°F+. Some cool-season crops beginning to bolt. | Transition to heat-tolerant crops; focus on watering strategy; plant heat-lovers like okra and sweet potatoes; succession with bolt-resistant varieties |
| Zone 9–10 (Southern CA, Gulf Coast, FL, AZ lowlands) | Intense heat and humidity. Frost is a distant memory. Cool-season crops are finished. | Avoid planting heat-sensitive crops; focus on shade management, deep watering, and mulching; plant heat-adapted tropicals; consider starting autumn planting planning |
The University of Minnesota Extension’s vegetable planting calendar confirms that in Zone 4, June 1 is the target transplant date for heat-lovers like tomatoes and peppers — the same date that Zone 6 gardeners are already thinking about second sowings. This four-week lag in the growing calendar has cascading effects on everything that follows.
Seasonal Garden Calendar
Know exactly what to plant, prune and sow — every month of the year.
Succession Sowing in June: Preventing the August Gap
The single most valuable thing most US gardeners fail to do in June is succession sow. If you planted lettuce and salad leaves in April and May, those plants are either bolting or will bolt in July’s heat. Without a June sowing, you face an August salad gap — a frustrating period where the spring crops are spent and the autumn ones are not yet ready. The same logic applies to beans, radishes, and root vegetables.
Lettuce and Salad Leaves
For Zone 5–6, sow another row of lettuce now using heat-tolerant or “slow-bolt” varieties: ‘Jericho’ (a romaine type bred for summer heat), ‘Nevada’ (butterhead, exceptional heat resistance), and ‘Black Seeded Simpson’ (loose-leaf, quick to mature at 45 days). NC State Cooperative Extension recommends sowing lettuce in partial shade in summer — under taller crops like pole beans or in a shadecloth frame — to reduce soil surface temperature by 10–15°F, which significantly improves germination.
In Zone 7–8, direct-sow lettuce is risky in June without shade protection. Use a 30% shadecloth tunnel or sow under sweet corn. In Zone 9–10, lettuce is not viable outdoors until September; skip it for now.
French and Runner Beans for Autumn Harvest
A second sowing of French beans (dwarf or bush types) made in early June in Zone 5–7 will yield a fresh flush of pods in August and September, when the first sowing has finished. This is one of the highest-value succession sowings you can make — beans are fast (50–60 days from seed), productive, and nitrogen-fixing. Runner beans sown now in Zone 6–7 will be climbing and flowering before the end of July.
Penn State Extension’s vegetable planting guide gives June 15 as the last recommended date for bean planting in Zone 6 — meaning early June sowings have full season potential, but mid-June sowings carry some frost risk in colder zones. In Zone 7–8, June beans are well within the window and will produce well into October.
Radishes
Radishes are a 25-day crop. A June sowing gives you a July harvest, and a sowing every two weeks through early July keeps the supply continuous. In Zone 5–6, avoid mid-summer gaps by sowing ‘French Breakfast’, ‘Cherry Belle’, or ‘Easter Egg’ mix. In Zone 7+, switch to daikon-type radishes (‘April Cross’, ‘Minowase’) which handle heat better than round varieties.
Turnips and Beets in Zone 5–6
Early June is the last comfortable window for sowing turnips and beets for summer harvest in Zone 5–6. Beets sown in early June mature in 50–70 days — right around late July and August. Use ‘Bull’s Blood’ (dual-purpose leaf and root), ‘Chioggia’ (candy-stripe), or ‘Detroit Dark Red’ for reliability. Oregon State University Extension recommends thinning beets to 3 inches when the seedlings reach 2 inches — skipping this step is the most common reason for poor root development in summer sowings.
Biennial Flower Sowing: Planting for Next Year
June is the moment to start your garden’s next chapter. Biennial flowers — plants that grow vegetatively in their first year and flower in their second — must be sown this month if you want them blooming next spring and summer. This is one of the most overlooked actions in the American gardening calendar, despite biennials producing some of the most spectacular cottage garden displays imaginable.
Foxgloves (Digitalis purpurea)
Sow foxglove seeds in small trays or modules in June. The seeds are fine — barely scatter them over the surface of seed compost and press lightly; they need light to germinate. Keep moist and in a bright, sheltered spot. Seedlings appear in two to three weeks. Transplant into the garden border in September or October. They will form strong rosettes through autumn, overwinter (hardy to Zone 4), and throw up spectacular 4–6 foot flower spikes the following June. Without this June sowing, you have no foxgloves next summer.
Varieties to sow: ‘Camelot Cream’ (white with maroon spots), ‘Excelsior Mixed’ (traditional cottage mix), ‘Dalmatian Purple’ (compact at 24 inches, good for smaller borders). NC State Extension confirms foxgloves are hardy in Zone 4–9 as biennials.
Wallflowers (Erysimum cheiri)
Wallflowers are the classic spring bedding plant — deeply fragrant, in rich jewel tones of orange, red, yellow, and bronze — and they must be sown now in the US for next spring’s display. Sow in a seed tray or directly into a nursery bed, thin to 6 inches, and transplant to final positions in October. Hardy to Zone 6; in Zone 4–5 treat as annual and overwinter as rooted cuttings under glass.
Sweet William (Dianthus barbatus)
Sweet William is reliably biennial and one of the easiest to sow. Direct sow now into a prepared bed, thin to 12 inches, and transplant in autumn. The following June, it produces densely packed domed flower heads in pinks, reds, whites, and bicolours that attract butterflies and last well as cut flowers. Hardy to Zone 3.
Hollyhocks (Alcea rosea)
Hollyhocks sown from seed in June will develop into large, leafy rosettes through summer, overwinter as a basal crown, and produce their dramatic 6–8 foot flower spikes the following July. Direct sow 18 inches apart where they are to flower — hollyhocks dislike root disturbance. Varieties to try: ‘Chater’s Double Mixed’ (fully double flowers, cottage classic), ‘Nigra’ (almost black single flowers, striking). Hardy to Zone 3, though rust fungus is the main problem — improve air circulation and avoid overhead watering.
New Annual Flowers for Direct Sowing in June
June is not too late for direct-sown annuals — in fact, a June sowing of fast-maturing annuals gives a second wave of colour that carries the garden through September and October when the first-sown plants start to tire. For more on designing your flower borders around structural companion planting principles, see our companion planting guide.
Marigolds (Second Sowing)
If you sowed marigolds in April or May, those plants are blooming now. A June sowing of French marigolds (‘Naughty Marietta’, ‘Mr Majestic’, ‘Bonanza Mix’) gives a fresh flush of colour from August through hard frost. In Zone 7+, a June sowing actually performs better than an April sowing — plants avoid the humid late-spring conditions that can cause damping off, and they hit their stride exactly when gardens need colour most. For companion planting benefits around tomatoes and beans, see our full sunflower growing guide for how marigolds and sunflowers work together as a pest-deterrent team.
Zinnias
If you have not sown zinnias yet, June is your last good window in most zones. Zinnias are fast — 60–70 days to first flower — and a June sowing in Zone 5–8 will give blooms from mid-August through October. Direct sow where they are to flower (zinnias hate root disturbance), 12 inches apart. ‘Benary’s Giant’ for cutting, ‘Zahara’ series for disease resistance in humid zones, ‘Profusion’ for container growing.
Nasturtiums (Succession Sowing)
A June nasturtium sowing gives fresh, vigorous plants through autumn — important because first-sown nasturtiums often succumb to aphid pressure by August. Direct sow 1 inch deep, 10 inches apart. ‘Empress of India’ (deep scarlet, compact), ‘Alaska’ (variegated foliage, edible flowers), ‘Climbing Mix’ (for wigwams and fences). The flowers and leaves are entirely edible — a peppery addition to summer salads.
Summer Bulb Planting in June
Most summer bulbs go in the ground in spring, but June planting is still valid — and for succession planting of gladiolus, it is specifically recommended. These are the bulbs to plant now.
Canna Lilies
In Zone 6 and warmer, canna lily rhizomes planted now will establish and produce foliage and flowers before autumn. They need warm soil (above 60°F), so planting into cold May soil often produces disappointing results. A June planting in warm ground frequently catches up to earlier sowings by August. Plant 4 inches deep, 18–24 inches apart. ‘Tropicanna’ (bronze-striped foliage, orange flowers), ‘Stuttgart’ (variegated green-and-white foliage), ‘Bengal Tiger’ (striped foliage, yellow flowers with red margins).
In Zone 5, cannas planted now should be lifted in October before first frost and stored over winter. In Zone 9–10, cannas are perennial — plant whenever available.
Gladiolus (Succession Planting)
The key to continuous gladiolus blooms through summer and autumn is planting every two weeks from April through June. A final planting of gladiolus corms made in early June will produce flowers in late August and September — a time when most summer colour is fading and the garden especially needs height and drama. Oregon State University Extension recommends 4–6 inch planting depth for standard size corms, in full sun, spaced 6 inches apart. Corms planted in succession packs — mixed colours staggered by two-week intervals — give the most effective extended display.
Crocosmia
Crocosmia corms planted in June will establish rapidly in warm June soil and produce their arching stems of fiery orange-red flowers from August into September. ‘Lucifer’ is the most dramatic (bold red, to 4 feet), while ‘Emily McKenzie’ (orange with mahogany markings) and ‘Severn Sunrise’ (soft salmon-pink) offer more subtle tones. Hardy to Zone 6; in Zone 5 mulch heavily after planting.
Eucomis (Pineapple Lily)
Eucomis bulbs planted in June in Zone 7+ will produce their distinctive pineapple-like flower spikes in August. The flowers have a mild vanilla scent and last exceptionally well as cut flowers. ‘Sparkling Burgundy’ has purple foliage and deep wine-red flowers. Plant 4 inches deep in a sheltered, sunny spot. In Zone 5–6 grow in containers and bring under cover before first frost.
Dahlia Care in June: Pinching Out and Staking
Dahlias planted in late April and May are now growing strongly, and June brings the single most important maintenance task for getting the most from them: pinching out the central growing tip.
When a dahlia plant reaches around 16 inches tall, remove the topmost growing point by pinching out the central stem just above the second or third pair of leaves from the top. This sounds counterintuitive — you are removing growth from a plant you want to grow — but it forces the plant to redirect energy into lateral shoots. Instead of one or two tall stems with a handful of flowers, you get a bushy plant with eight to twelve flowering stems. Penn State Extension specifically recommends this practice for garden dahlias, noting that unpinched plants produce 40–60% fewer blooms than pinched specimens of the same variety.
Staking is equally urgent in June. Dahlias grow fast — a plant that looks manageable in early June can be 4 feet tall and top-heavy by late July. Push bamboo stakes in now, before the root system has fully extended, and loosely tie in the main stems with soft twine or garden velcro. Avoid waiting until the plant is clearly leaning — by that point, the stems are already at risk from wind or heavy rain. For large decorative or dinner-plate varieties, a ring stake or three-stake triangle gives better support than a single central cane. For the full summer care picture — watering, feeding, and deadheading — see our summer garden care guide.
Strawberry Runner Propagation
If your strawberry plants are throwing out runners right now — long, whippy stems with small plantlets forming at the nodes — June is the time to peg them down and start multiplying your stock. This is one of the most satisfying garden jobs of the year: completely free plants from stock you already have, ready to replace tired old crowns or expand your bed.
To propagate: fill small 3-inch pots with multipurpose compost and place them beneath the developing plantlets. Use a U-shaped wire pin (a bent paper clip works perfectly) or a small stone to hold the plantlet in contact with the compost surface. Within three to four weeks, roots will have developed into the pot and the new plant will be independent. At this point, cut the runner cord connecting it to the mother plant. Leave for another week, then transplant to its final position or pot up to a larger container.
NC State Extension recommends only pegging the first plantlet on each runner — the one closest to the mother plant is the most vigorous. Plantlets further along the runner tend to be smaller and establish more slowly. Remove any runners you do not want to propagate promptly — they divert energy from fruit production.
Only propagate from healthy, disease-free plants. Strawberry plants showing signs of verticillium wilt (wilting, yellowing leaves, dark discolouration at the crown), red stele root rot, or angular leaf scorch should not be propagated, as these diseases transmit through runners.
Pest and Disease Watch for June
June is when the garden’s pest and disease pressure escalates. Warm temperatures, new growth, and increasing humidity create ideal conditions for a predictable cast of problems.
Aphid Explosion
Aphid populations increase exponentially in June. On roses, check the undersides of new growth and flower buds — colonies build fast and distort growth if left unchecked. On beans, black bean aphid colonises the growing tips; on nasturtiums, aphids are almost inevitable but rarely cause serious damage. For mild infestations, a strong jet of water knocks colonies off without chemicals. For persistent or heavy infestations, insecticidal soap spray is effective and harmless to beneficial insects when dry. Introduce or encourage ladybugs, lacewings, and parasitic wasps — a single ladybug larva consumes up to 400 aphids during its development. For comprehensive pest-plant pairing strategies, see our companion planting guide.
Powdery Mildew
Powdery mildew appears in warm, dry conditions — exactly what June brings in Zone 6–8. It shows as a white powdery coating on leaves, starting on squash, courgettes, and roses. Prevention is far more effective than cure: ensure good air circulation by not over-crowding plants, water at the base rather than overhead, and remove infected leaves promptly. Baking soda spray (1 tablespoon per gallon of water) can slow the spread of early infections. Resistant varieties of squash (‘Dunja’ courgette, ‘Honey Bear’ acorn squash) are worth growing in areas with chronic mildew problems.
Lily Beetle
Bright scarlet lily beetle adults and their distinctively disgusting larvae (coated in their own black excrement) are active from May through August, and June is peak season. They feed on true lilies (Lilium species) and fritillaries, stripping leaves and stems completely if left unchecked. Check plants daily — look on the undersides of leaves for the orange-red egg clusters and the larvae. The adult beetles are fast-moving and drop to the ground when disturbed, where their black underside makes them difficult to find. Hold your hand under the leaf before disturbing the plant, or flick beetles into a tray of soapy water. University of Minnesota Extension notes that lily beetle populations have spread significantly across the northeastern US over the past decade and are now established in many Zone 5–6 gardens where they were previously absent.
Watering Strategy as Heat Increases
June marks the beginning of the watering season for most US gardeners. Getting your approach right now — before the real heat of July and August — sets up good habits and healthier plants for the rest of the summer.
Water in the morning. Morning watering allows leaves to dry during the day, reducing fungal disease pressure. It also means water is available to plants during peak photosynthesis hours. Evening watering leaves foliage wet overnight — the primary driver of powdery mildew, botrytis, and downy mildew.
Water at the base, not overhead. Use a soaker hose, drip irrigation, or a watering can directed at the root zone. Overhead watering via a sprinkler wets foliage unnecessarily and delivers less water to the root zone per minute than ground-level watering. NC State Extension research shows that drip irrigation can reduce water use by 30–50% compared to overhead sprinklers while achieving equal or better plant growth.
Deep, infrequent watering beats frequent shallow watering. A thorough soak once or twice a week encourages deep root development. Frequent light waterings keep moisture at the surface, which encourages shallow root systems and increases stress vulnerability in heat. The target is to wet the soil to 6–8 inches depth. For most soils in Zone 5–6, this requires approximately 1 inch of water per week from rain or irrigation combined.
Drought stress symptoms to watch for: wilting in the morning (evening wilting is normal in heat), leaves curling inward, blue-grey tones appearing in foliage (particularly on brassicas and beans), and poor fruit set on tomatoes and squash. Consistent soil moisture is critical for tomatoes specifically — irregular watering causes blossom-end rot and fruit splitting, both of which are calcium-uptake problems triggered by fluctuating water availability rather than calcium deficiency in the soil.
Mulch is your most powerful watering tool. A 2–3 inch layer of organic mulch (straw, wood chip, garden compost) across the soil surface retains moisture, suppresses weeds that compete for water, and moderates soil temperature. Oregon State University Extension recommends mulching after watering to seal moisture in — mulching dry soil just locks dryness in place. Apply mulch in June before the summer heat peaks and you will water significantly less for the rest of the season.
Companion Planting and Structural Flowers in June
June is the right moment to fill any gaps in your beds with companion plants that pull double duty — attracting pollinators, deterring pests, and adding colour. Marigolds around tomatoes and beans, nasturtiums as aphid traps, sweet alyssum as a ground-cover pollinator attractant, and borage (direct sow now for July flowers) as a cucumber companion are the high-value additions for this month. For the full framework on pairing plants for maximum effect, our companion planting guide covers every combination worth knowing. If you are growing sunflowers — which should be in the ground or just establishing now — see our sunflower growing guide for the June staking and feeding advice that determines how tall and productive they grow.
For herb growers, June is prime time for basil — the warm soil and long days produce the fastest, most aromatic growth of the year. Pinch out flower buds regularly to keep plants productive through summer, and consider a second sowing now for a September harvest when the first plants go to seed. Our basil growing guide covers the full growing season.
Frequently Asked Questions
What can I still plant in June?
Quite a lot. In Zone 5–6, you can still direct sow beans, beets, turnips, radishes, zinnias, marigolds, and nasturtiums. You can also plant summer bulbs (canna, gladiolus, crocosmia, eucomis) and start biennial flowers (foxgloves, hollyhocks, wallflowers, sweet William) in seed trays for transplanting in autumn. In Zone 3–4, June is actually prime planting time — most tender crops go out in early June after last frost. In Zone 7–10, focus shifts to heat-tolerant crops (okra, sweet potatoes, Southern peas) and autumn garden planning.
Is it too late to plant tomatoes in June?
In Zone 5–6, early June is within the planting window but is the limit. Tomatoes planted in early June (transplants, not seed) have enough season to ripen most varieties before first autumn frost in late September or October. Mid-June transplants in Zone 5 are risky for full-season varieties — choose short-season types (‘Early Girl’ at 52 days, ‘Glacier’ at 55 days, ‘Siletz’ at 52 days) if planting late. In Zone 7–8, June tomato planting is normal and successful. In Zone 9–10, tomatoes planted in June will often struggle with summer heat and do better with a late-summer planting for autumn harvest.
What flowers can I direct sow in June?
Fast-maturing annuals are your best options for direct sowing in June: zinnias (60–70 days to flower), marigolds (50–55 days), nasturtiums (50–60 days), sunflowers in Zone 6+ (60–80 days depending on variety), and bachelor’s buttons (‘Cornflower Blue’, 70 days). Biennial flowers — foxgloves, hollyhocks, wallflowers, sweet William — are sown in June not for this year’s flowering but for spectacular blooms next spring and summer. These are the high-value sowings that most gardeners miss and then regret in February when everyone else’s foxgloves are coming up strong.
Sources
- NC State Cooperative Extension — Vegetable Planting Calendar and Seasonal Gardening Guidelines
- Oregon State University Extension — Summer Vegetable Gardening and Irrigation Best Practices
- Penn State Extension — Dahlia Culture and Vegetable Planting Guide
- University of Minnesota Extension — Vegetable Garden Planting Calendar and Pest Identification
