How to Grow Turnip
Brassica rapa subsp. rapa
Turnips are a remarkably hardy and fast-growing cool-season crop that delivers both nutritious roots and edible greens in just 45-70 days. These biennial vegetables thrive in spring and fall gardens, offering home gardeners an reliable harvest with minimal fuss and excellent storage potential.
soil preparation
Turnips perform best in well-drained loamy soil with a pH between 5.5 and 7.5. Begin soil preparation 2-3 weeks before planting by working the bed to remove rocks and debris that could cause root forking. Incorporate 2-3 inches of compost or aged manure into the top 8-10 inches of soil to improve structure and drainage. Loamy soil naturally supports good root development, but if your soil tends toward clay, add additional compost to lighten it. If your soil is sandy, work in compost to increase moisture retention. Test soil pH and adjust if needed: add lime to raise pH above 5.5, or sulfur to lower it below 7.5. Ensure beds are well-drained to prevent waterlogging, which leads to root rot. Create raised beds if your native soil is compacted or poorly draining. The soil should be loose enough that a trowel slides through easily without resistance.
planting steps
Prepare and Direct Sow Seeds
Direct sow turnip seeds directly into prepared beds once soil is workable in spring, or 8-10 weeks before your first fall frost. Sow seeds at a depth of exactly 1/4 inch, placing them in rows spaced 12-18 inches apart. Sow seeds thickly (closer together than final spacing) since germination will be selective. Seeds will germinate in as few as 3 days when soil temperature is 30°F or warmer, though germination accelerates at warmer temperatures within the ideal growing range of 41-75°F (5-24°C).
Tip: For faster, more reliable germination, soak seeds in room-temperature water for 2 hours before sowing. Direct sowing avoids transplant shock and is faster than starting seeds indoors for this quick-maturing crop.
Thin Seedlings to Final Spacing
When seedlings develop their first true leaves (approximately 10-14 days after germination), thin to final spacing of 4-6 inches apart in the row. Turnips are very tolerant of crowding, so the smaller end of this range (4 inches) is acceptable and produces smaller, more tender roots. The larger spacing (6 inches) supports bigger roots if desired. Remove surplus seedlings carefully by pinching off at soil level rather than pulling, which can disturb remaining plants' roots. The thinned seedlings are edible as delicate greens.
Tip: Thin gradually in two passes if desired: thin to 2-3 inches at 2 weeks, then to final spacing at 3 weeks. This reduces waste and gives you tender greens at each thinning.
Maintain Consistent Moisture During Establishment
Keep seedbed consistently moist but not waterlogged for the first 2-3 weeks after sowing. This supports rapid germination and strong root development. Water gently with a fine mist to avoid displacing seeds. Once seedlings are established and thinned, transition to regular watering schedule.
Tip: Cover seed rows with damp burlap or shade cloth for 3-5 days in hot weather to prevent soil crusting and maintain moisture—remove once germination begins.
watering
Turnips require consistent moisture for best quality and fastest growth, with a target of 1 inch of water per week delivered through rainfall or irrigation. During the germination phase (first 3-7 days after sowing), water gently and frequently to keep soil consistently moist 1/4 inch deep. Once seedlings emerge and are thinned to final spacing, establish a regular watering schedule: deliver 1 inch per week in a single deep irrigation, or divide into two 0.5-inch applications if weather is exceptionally hot (above 75°F). Water deeply in early morning to reach the entire root zone (6-8 inches deep) and reduce foliage disease pressure. In spring with regular rainfall, supplemental watering may not be necessary; in dry periods or summer plantings, irrigation is essential. Consistency is critical for quality—irregular watering causes roots to split, become pithy, or develop an unpleasant strong flavor. Watch for wilting leaves as an indicator that roots need water. Overwatering in poorly drained soil causes root rot and fungal disease; ensure your beds drain freely after rain or irrigation.
feeding & fertilizer
Turnips have medium nutrient needs and respond well to a moderately fertile, loamy bed with a soil pH of 5.5-7.5. Loamy soil—a balanced mix of sand, silt, and clay—provides excellent drainage and the loose structure roots need for proper development. Test your soil pH before planting and amend as needed to bring it into the ideal 5.5-7.5 range. Before planting, incorporate 2-3 inches of compost or well-aged manure into the top 8-10 inches of soil. This provides slow-release nitrogen, phosphorus, and potassium throughout the growing season and is usually sufficient for the entire crop. If your soil test indicates low fertility or if plants show yellowing (nitrogen deficiency) by week 3-4 of growth, apply a balanced liquid fertilizer (10-10-10 NPK or similar) at half strength every 2-3 weeks. Side-dress with compost around plants at the 4-week mark if growth appears slow. Avoid excess nitrogen, which encourages leafy growth at the expense of root development and can delay maturity. Turnips do not require additional feeding during the final 3 weeks before harvest.
pruning & training
Turnips require no pruning or pinching. Allow the foliage to develop naturally for photosynthesis that powers root growth. However, you may harvest outer leaves individually as greens while roots are developing, cutting only the outer leaves and leaving the growing center intact. This light harvesting does not significantly impact root development. Once roots reach 1-2 inches in diameter (approximately 4-5 weeks after germination), you can begin selective leaf harvesting if desired, removing no more than 25% of foliage at a time. Stop all leaf harvesting 2-3 weeks before your target root harvest date to allow plants to direct energy to root maturation.
harvesting
Turnips mature in 45-70 days depending on variety, season, and growing temperature. Harvest timing depends on your preference for root size and tenderness. For tender, mild roots ideal for fresh eating, harvest when roots reach 1.5-3 inches in diameter—they will be buttery and sweet. Spring-grown turnips typically mature at the faster end of the range (45-60 days); fall-grown turnips may take longer due to shorter days and cooling temperatures. Check root size by gently scraping away a small amount of soil to expose the shoulder of the root without pulling it. You may leave roots in the ground up to 4 inches in diameter for heartier flavor and larger yields, but beyond this size they become woody and develop strong flavor unsuitable for most palates. Harvest by loosening soil with a spade or fork to a depth of 6-8 inches around the plant, then gently pull. Handle harvested roots carefully to avoid bruising. Spring-planted turnips should be harvested before late June heat arrives, as warm temperatures cause rapid decline in quality. Fall-planted turnips can be harvested through November and often improve in flavor after a light frost. Succession planting every 2-3 weeks provides continuous harvest from a single bed.
storage & preservation
Turnips store exceptionally well and improve in eating quality after proper storage. Harvest roots in dry conditions, trim roots and leaf stems to 1/4 inch above the root crown, and brush off excess soil without washing. Place in a perforated plastic bag or wooden crate and store in cool conditions (32-40°F) with 95% humidity—a root cellar, unheated basement, or refrigerator's crisper drawer works well. Under these conditions, turnips store 4-5 months without significant quality loss. Do not wash turnips before storage, as moisture encourages rot. Smaller roots (1-2 inches diameter) store best, with larger roots sometimes developing interior browning or sprouting during extended storage. For long-term preservation, turnips can be blanched 2-3 minutes and frozen in airtight containers for up to 8 months. Some gardeners prefer to leave mature turnips in the ground through fall in northern climates (zones 3-5), mulching heavily with 6-8 inches of leaves or straw; they can be harvested throughout winter as needed where frost prevents soil from freezing solid.
common mistakes to avoid
- ✗Planting in summer heat: Turnips planted in mid-summer when temperatures exceed 75°F bolt and develop strong, unpleasant flavors. Plant only in spring (as soon as soil is workable) or mid-to-late summer for fall harvest. In zones 8-10, grow turnips only in winter.
- ✗Inconsistent watering: Irregular moisture causes roots to split, become pithy, or develop off-flavors. Aim for steady 1 inch per week from rain or irrigation. Mulching with 1-2 inches of compost helps retain moisture and regulate soil temperature.
- ✗Crowded spacing: Leaving seedlings too close together (less than 3 inches apart) produces undersized, slow-growing roots and promotes disease. Thin aggressively to 4-6 inches to maximize root development and air circulation.
- ✗Harvesting too late: Allowing roots to grow beyond 4 inches in diameter significantly reduces eating quality, creating woody, strong-flavored roots. Harvest at 1.5-3 inches for best texture and mild flavor, or no larger than 4 inches at maximum.
- ✗Over-fertilizing: Excess nitrogen promotes leaf growth at the expense of root development and delays maturity. A single compost amendment at planting is usually sufficient; avoid frequent feeding.
- ✗Planting too deep: Seeds sown deeper than 1/4 inch germinate slowly or not at all. Measure planting depth carefully and firm soil gently to ensure good seed-soil contact without compaction.
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