How to Grow Turnips: Ready in 45 Days, With Two Harvests Per Year
Grow sweet, crisp turnips in 38–60 days with two harvests per year. Zone-by-zone planting calendar, the nitrogen trap to avoid, and a diagnostic table for common problems.
The turnip you have eaten before probably tasted nothing like a fresh-grown one. Store-bought turnips spend weeks in cold storage after traveling far from where they were grown. The starches convert, the sugars dissipate, and what reaches your plate is a pale shadow of what comes out of a home garden at the right moment — 2 to 3 inches across, harvested at peak sweetness, still slightly cool from the soil.
Growing your own is faster than almost any other root crop. Most varieties are ready in 38 to 60 days, produce both an edible root and continuous greens from the same plant, and thrive in the cool windows — spring and fall — when most vegetables struggle. Plant once in spring, once in fall, and a single packet of seed keeps your kitchen supplied from May through December in most zones.
This guide covers both harvests in full: what to plant for each season, exactly when to sow in your zone, why timing determines whether you get sweet crisp roots or bolted plants, and how to grow the greens as seriously as the roots.
Why Turnips Belong in Every Kitchen Garden
Turnips fill timing gaps that most vegetables cannot. They thrive at 40 to 75°F — exactly the temperature window when gardens are transitioning between main crops. They produce two things from one planting: a root and a continuous supply of greens, with the greens ready in as little as three weeks and the root harvestable six weeks after that.
Speed sets them apart from nearly every other root vegetable. MSU Extension puts the range at 30 to 50 days for most turnip varieties — compared with 70 or more days for carrots and 120 or more for parsnips. And unlike carrots, which need deep, stone-free soil to produce attractive straight roots, turnips perform well in most garden soils with basic preparation.
The fall crop is the real prize. A few light frosts after root formation convert starches to sugars, producing a naturally sweeter root. Because fall plants germinate in warm soil, they also sidestep the main cause of spring crop failures: bolting. Fall pest pressure runs lighter too, with flea beetle populations declining as temperatures drop.
Choosing Your Variety: Roots, Greens, or Both?
Turnips divide into three clear categories — varieties bred for roots, varieties bred for greens, and dual-purpose types. Picking the right one for your goal matters more than most articles suggest.
For first-time growers, ‘Purple Top White Globe’ is the safe choice: widely available, dual-purpose, and reliable across all zones in both spring and fall. At 50 to 55 days, it gives you enough time to course-correct if something goes wrong.
For raw eating and salads, ‘Hakurei’ operates in a different category entirely. Johnny’s Selected Seeds describes it as “sweet and fruity” with “juicy and tender” texture — closer to eating an apple than a root vegetable. Harvest it young, no larger than 2 inches, before the sugars begin converting back to starch as the root matures and expands.
For the fastest harvest, ‘Tokyo Cross’ is ready in 35 days and handles both spring and fall reliably.
For greens only, ‘Shogoin’ and ‘Seven Tops’ channel most of their energy into the leaves and produce small or no usable roots — the right choice if you want turnip greens as a primary crop rather than a side benefit.
| Variety | Days to Maturity | Flavor Profile | Best For | Harvest Size |
|---|---|---|---|---|
| Purple Top White Globe | 50–55 days | Mild, earthy | Roots & greens; beginners | 2–3 inches |
| Hakurei | 38 days | Sweet, fruity | Raw eating, salads | 1–2 inches |
| Tokyo Cross | 35 days | Mild, slightly spicy | Fastest harvest; containers | 2–3 inches |
| White Lady | 50 days | Mild, tender | Smooth white roots | 2–3 inches |
| Seven Tops | 45 days | Mild | Greens only | Small root |
| Shogoin | 30–40 days | Very mild | Greens only; quick harvest | No usable root |
Soil Preparation and the Nitrogen Trap
Turnips are not demanding plants, but they have one quirk that trips up many new growers: too much nitrogen drives leafy top growth at the direct expense of root development.
Clemson Cooperative Extension flags this directly: “over-fertilization of nitrogen may reduce root formation.” The mechanism is hormonal — high nitrogen maintains gibberellin levels in the plant, which promotes continued vegetative shoot growth and suppresses the shift toward carbohydrate storage in the root. Feed too heavily and you harvest a beautiful bunch of greens over a thumb-sized disappointment of a root.
What to apply and when:
- Before sowing: work in 1 to 2 lbs of balanced 10-10-10 fertilizer per 100 square feet, according to Iowa State Extension
- Three weeks after germination: side-dress with calcium nitrate (15.5-0-0) at 1 lb per 100 square feet to support continued growth without the root-suppression effect of heavier pre-plant doses
- After that: no additional nitrogen applications unless leaves show genuine yellowing from nutrient deficiency
Soil requirements:
- pH 6.0 to 6.5 for best root development; raising to 7.2 suppresses clubroot spores if you have had disease problems previously
- Deep, loose, and well-drained — turnip roots develop in the top 10 to 12 inches of soil; rocky or compacted layers directly cause forking and misshaping
- Incorporate compost before sowing to improve drainage and moisture retention. Making your own compost is the most cost-effective way to build the loose, moisture-retentive soil structure turnips grow best in
- Rotate away from where any Brassica (cabbage, broccoli, kale, radishes) grew in the past three years — clubroot spores persist in soil for up to 20 years and re-infect the same bed repeatedly
Soil temperature governs germination speed. MSU Extension puts the viable germination range at 40 to 105°F, with seeds emerging in 6 to 10 days under cool conditions. Below 40°F, germination stalls entirely. Wait until the top inch of soil has reached at least 40°F before sowing — in most zones, this coincides with the frost-date windows in the planting calendar below.
When to Plant Turnips: Zone-by-Zone Calendar
Every turnip guide tells you to plant in spring and fall. Few provide the specific date windows that determine whether your crop succeeds or bolts before sizing up. The calendar below translates general advice into actionable sowing dates by USDA zone.
The spring rule: sow 2 to 3 weeks before your average last frost date, as soon as soil reaches 40°F. The fall rule: count 60 days back from your average first frost date, then add 2 weeks as a buffer for slower autumn growth rates. That gives you the fall sow window.
| USDA Zone | Avg Last Frost | Spring Sow Window | Avg First Frost | Fall Sow Window |
|---|---|---|---|---|
| Zone 3 | May 15–31 | Apr 20 – May 5 | Sep 15–30 | Jul 15 – Aug 1 |
| Zone 4 | Apr 30 – May 15 | Apr 5–20 | Oct 1–15 | Aug 1–15 |
| Zone 5 | Apr 7–30 | Mar 15 – Apr 7 | Oct 15–31 | Aug 15 – Sep 1 |
| Zone 6 | Mar 30 – Apr 7 | Mar 1–20 | Oct 31 – Nov 15 | Sep 1–15 |
| Zone 7 | Mar 15–30 | Feb 15 – Mar 10 | Nov 15–30 | Sep 10–30 |
| Zone 8 | Feb 15 – Mar 15 | Jan 15 – Feb 15 | Dec 1–15 | Sep 20 – Oct 15 |
| Zone 9 | Jan 30 – Feb 15 | Jan 1–31 | Dec 15 – Jan 1 | Oct 1 – Nov 1 |
Succession sowing extends the harvest window considerably. Rather than one large planting, sow every 10 to 14 days within each window for a continuous supply of tender roots and greens, according to Illinois Extension. This approach also reduces the risk that a single bad-weather event ruins your entire crop.
Sowing depth and spacing: Sow at ¼ to ½ inch deep, 1 to 2 seeds per inch. Thin to 3 to 6 inches apart when seedlings reach 4 inches tall. The wider spacing produces larger, full-size roots; tighter spacing at 2 to 3 inches suits baby turnips and greens-only production.
Why Spring Timing Is Harder Than It Looks: The Bolt Mechanism
Most growing guides note that turnips bolt in summer. Few explain why — and without understanding the mechanism, you cannot reliably prevent it or adapt your timing when a season runs unusually warm or cold.
Turnips are winter/spring annuals with a two-stage flowering process. First, the plant must accumulate cold exposure — 39 to 44°F for two to four weeks — to complete vernalization, the biological clock that signals readiness to flower. Second, long days pull the trigger. According to MSU Extension, once vernalized, turnips respond to the long photoperiods of mid-to-late June by diverting resources into flower stalk production rather than root development.
The problem in spring: seeds germinate in cool soil and accumulate vernalization units even as seedlings. If cool weather persists into late spring — common in zones 3 through 6 — the plant arrives at long-day conditions already fully vernalized. The root has not had enough time to size up before the plant shifts its energy toward flowering.
There is also a devernalization effect worth knowing: temperatures above 64°F reverse vernalization progress. This is why late-spring sowings in zones 7 through 9 often succeed where earlier sowings fail — the warmth interrupts cold accumulation before it crosses the bolt threshold.
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→ View My Garden CalendarWhat this means in practice:
- Zones 3 through 6: sow at the early end of the spring window shown in the table. The root must reach harvestable size before June’s long days arrive. Do not wait until soil feels “nicely warm” — you need those cool growing weeks working in your favor, not burning away before the root is ready.
- Zones 7 through 9: the spring window is wider because warmer temperatures devernalize the plant before the bolt threshold is crossed. Still, summer heat causes bitterness and texture problems, so stay within the date windows above.
- Fall crops sidestep the bolt problem entirely: plants germinate in warm soil, accumulating no cold exposure, grow through naturally cooling weeks, and are harvested before sufficient chill can complete the vernalization sequence. This is the core reason experienced growers prioritize the fall crop for consistent quality and flavor.
Watering and Mulching for Sweet, Crisp Roots
Drought stress at any point produces bitter turnips. When water-stressed, the plant concentrates glucosinolates in the root as a chemical defense response — the same compounds responsible for the sharp, peppery bite that gives turnips an undeserved bad reputation. University of Minnesota Extension confirms it: drought stress “can make them bitter or woody.”
Target 1 to 1½ inches of water per week, consistent across the growing season. The most critical window is weeks three through six after sowing, when the root is actively expanding. Inconsistent watering — dry spells followed by heavy irrigation — triggers the same stress response as sustained drought and can also cause the root to crack or split.
Mulching is the most reliable way to stabilize soil moisture without constant monitoring. A 2 to 3 inch layer of straw, shredded leaves, or grass clippings applied after thinning reduces evaporation, buffers temperature swings, and suppresses weeds. Choosing the right mulch material for your soil type matters — organic mulches also improve soil structure as they decompose, creating exactly the loose, moisture-retentive conditions that produce the best roots.
For fall crops, heavy mulching serves a second purpose: it extends the harvest window by insulating the ground against early freeze. In zones 6 and warmer, mulched beds can yield harvestable turnips well into December. The roots in the ground continue to sweeten as temperatures gradually drop below each frost threshold.
Common Turnip Problems: Diagnosis and Fix
| Symptom | Likely Cause | Fix |
|---|---|---|
| Woody, pithy root | Harvested too large or after heat stress | Harvest at 2–3 inches; prioritize fall crops for best texture |
| Bitter flavor | Drought or temperatures above 75°F | Water consistently 1–1½ inches per week; harvest before summer heat |
| Forked or misshapen roots | Rocky, compacted, or recently manured soil | Deep-till to 12 inches; incorporate compost; avoid fresh manure |
| Lush tops, no root development | Excess nitrogen or insufficient sunlight | Reduce nitrogen fertilizer; ensure 6+ hours of direct sun daily |
| Flower stalk from center (bolting) | Vernalization completed, then long days triggered | Sow earlier in spring; choose fast varieties like ‘Tokyo Cross’ |
| Small holes across leaves | Flea beetles | Row cover from planting time; diatomaceous earth along row edges |
| Yellowing outer leaves | Nitrogen deficiency or waterlogging | Soil test; improve drainage; side-dress with calcium nitrate if N is low |
| Stunted plants, distorted roots | Clubroot disease (Plasmodiophora brassicae) | Raise soil pH to 7.2; rotate crops for 3+ years; never compost infected material |
Harvesting: Roots, Greens, or Both?
The root quality window is narrow. Harvest at 2 to 3 inches in diameter — University of Florida IFAS is direct about what happens after that: roots larger than 3 inches become “pungent, pithy and stringy.” Do not judge readiness by the visible shoulder above soil. Push a finger into the soil beside the stem to feel the width, or mark the bed at sowing so you can count toward the variety’s days-to-maturity and check at the right time.
Fall-planted turnips can remain in the ground after light frosts. Cold temperatures sweeten the root rather than damaging it, and you can harvest as needed over several weeks rather than all at once. Roots that have experienced three or four frost events are noticeably sweeter than those pulled before any cold exposure.
Harvesting greens works on a continuous outer-leaf basis. Pull leaves once they reach 4 to 6 inches long — Iowa State Extension recommends this length for peak tenderness. UF/IFAS confirms that greens “can be harvested continuously through the growing season” without pulling the plant. Take no more than one-third of the leaf area at a time, which allows the plant to continue fueling root development beneath the soil.
The case for treating greens as seriously as roots: Most guides mention turnip greens as an afterthought. The research makes a stronger argument. A 2021 review published in Frontiers in Nutrition found that turnip greens contain 16 types of glucosinolates compared to only 10 in the roots. The leaves hold significantly higher concentrations of carotenoids, lutein, and vitamins A, B, and K. Flavonoids — including quercetin, kaempferol, and isorhamnetin derivatives — were detected in the greens but not in the roots at all. If you are growing turnips partly for their nutritional value, the greens are the more valuable half of the plant.
Yield: Expect 5 to 7 lbs of roots or greens per 10 linear feet of row, according to USU Extension.
Storage: Remove tops before refrigerating roots — the greens actively draw moisture from the root and accelerate deterioration. Refrigerate at 32 to 34°F with high humidity. Most varieties hold for 1 to 2 weeks. Greens are best used fresh within a few days of harvest.
Growing Turnips in Small Spaces and Vertical Gardens
Turnips adapt well to containers and raised beds, and their short growing cycle makes them excellent succession crops. Early peas, beans, or garlic that clear midsummer create exactly the open bed space needed for the fall sowing window — the same ground produces two different crops with no growing-season waste between them.
For container growing, use a pot at least 12 inches deep. Roots need 10 to 12 inches of unobstructed growing room to develop properly. A 12-inch wide container holds three full-size turnips or five baby varieties spaced at 3 inches. ‘Hakurei’ and ‘Tokyo Cross’ are the best container choices: compact, fast-maturing, and tolerant of the faster moisture fluctuations that come with potted growing. Water containers more frequently than ground beds, and check daily in warm weather — drought stress in a pot happens faster and produces bitter roots more quickly than in open ground.
Turnips also pair naturally with vertical growing systems that leave ground-level space underused. Climbing crops on a trellis create dappled shade during the hottest hours of the day, which turnips can tolerate and which extends their productive window by a few degrees in warmer zones where afternoon heat would otherwise push root temperatures above 75°F and trigger bitterness.
Frequently Asked Questions
How long does it take to grow turnips?
Most varieties mature in 35 to 60 days from direct sowing. ‘Tokyo Cross’ is fastest at 35 days; ‘Hakurei’ at 38 days; ‘Purple Top White Globe’ takes 50 to 55 days. Greens can be harvested from outer leaves within 3 to 4 weeks of sowing — well before the root is ready to pull.
Can I grow turnips in containers?
Yes, in containers at least 12 inches deep. ‘Hakurei’ and ‘Tokyo Cross’ are the best container varieties — both are compact and fast-maturing. Water more frequently than ground beds, since containers dry out faster. Consistent moisture is especially important in pots because drought stress causes bitterness more quickly in the limited root zone of a container.
Why are my turnips bitter?
Bitterness almost always comes from one of three causes: heat stress during root development (temperatures above 75°F), drought stress from inconsistent or insufficient watering, or harvesting too late (roots beyond 3 inches concentrate more glucosinolates and develop a woody texture). Fall crops grown with consistent moisture and harvested at the right size are rarely bitter.
Can I eat turnip greens?
Yes — and they are nutritionally superior to the roots in several respects. Research shows greens contain more types of glucosinolates, more carotenoids, and higher concentrations of vitamins A, B, and K than the roots. Flavonoids present in the greens are not found in the roots at all. Young leaves are mild enough to eat raw in salads; older leaves are best sautéed with garlic or added to soups, similar to kale or collards.
How do I prevent turnips from bolting?
In spring: sow early enough that roots reach harvestable size before long days arrive in June, harvest promptly, and choose fast-maturing varieties like ‘Tokyo Cross’. In fall: bolt risk is much lower because plants germinate in warm soil and never accumulate the 2 to 4 weeks of cold exposure needed to complete vernalization before harvest. If you find yourself fighting spring bolting, shifting your focus to fall crops solves the problem structurally.
Sources
- Illinois Extension — Turnip
- MSU Extension — How to Grow Turnips and Rutabagas
- Frontiers in Nutrition — Phytochemical Profile and Biological Effects of Turnip (Brassica rapa L.)
- Clemson Cooperative Extension — Turnips & Rutabagas (hgic.clemson.edu)
- University of Minnesota Extension — Growing Turnips and Rutabagas (extension.umn.edu)
- Iowa State Extension — Growing Turnips and Rutabagas in the Home Garden (yardandgarden.extension.iastate.edu)
- USU Extension — Rutabagas and Turnips in the Garden (extension.usu.edu)
- University of Florida IFAS — Turnips (gardeningsolutions.ifas.ufl.edu)
- MSU Extension — Bolting in Spring Vegetables (canr.msu.edu)
- Johnny’s Selected Seeds — Hakurei F1 Turnip (johnnyseeds.com)
- 7 Turnip Growing Problems
- Plant Turnips Before Your First Frost
- Best Companion Plants for Turnips
- 9 Turnip Varieties Ranked: Which to Choose for Fast Harvests, Hard Frosts, and Sweet Salad Greens
- How to Store Turnips After Harvest
