Growing turnips from seed delivers a reliable harvest of crisp, peppery roots that store well and fit neatly into early spring or late fall garden plans. This cool-season crop tolerates light frost, occupies minimal space, and offers both tender greens and flavorful bulbs for the table.
Choosing the Right Turnip Varieties
Selecting suitable varieties is the first critical step when you grow turnips from seed, because different types excel in either roots or greens. Globe-shaped cultivars like 'Hakurei' produce sweet, tender white roots ideal for fresh eating, while purple-top varieties such as 'Purple Top White Globe' store reliably and handle cooler temperatures well. For gardeners focused on leafy greens, 'Seven Top' and 'Topper' emphasize vigorous foliage for cooking or salads. Consider your climate, preferred harvest time, and whether you plan to harvest young salad turnips or mature storage roots when making your choice.
Preparing the Planting Site
Turnips thrive in full sun and loose, well-drained soil rich in organic matter, so prepare a dedicated bed with plenty of light. Clear the area of weeds, rocks, and debris, then loosen the top 8 to 10 inches with a fork or tiller to allow unimpeded bulb expansion. Amend the soil with finished compost or well-rotted manure to improve fertility and moisture retention, aiming for a slightly acidic to neutral pH between 6.0 and 7.0 for optimal nutrient uptake.
Soil Testing and Amendments
A simple soil test can reveal pH imbalances and nutrient deficiencies that affect how well your turnips develop. If the pH is too low, lightly incorporate garden lime; if it is too high, add elemental sulfur or peat to lower it. Work in a balanced, slow-release fertilizer or a modest side-dressing of compost a few days before sowing, but avoid excessive nitrogen that encourages lush foliage at the expense of root development.
Sowing Turnip Seeds at the Right Time
Timing your sowing correctly is essential when you grow turnips from seed, since these plants prefer cool weather and bolt quickly in heat. Plant successive crops every seven to ten days in early spring as soon as the soil can be worked, and again in late summer for a fall harvest. In mild climates, you can sow turnips throughout the cooler months, while hot regions benefit from earlier or later plantings to avoid the peak of summer heat.
Planting Depth and Spacing
Sow seeds about one-quarter to one-half inch deep, covering them lightly with fine soil, and space rows approximately 12 to 18 inches apart. Thin seedlings once they reach a few inches tall, leaving about 2 to 4 inches between plants for small, tender roots or 4 to 6 inches for larger storage varieties. Consistent thinning reduces competition for moisture and nutrients, promoting more uniform bulb formation.
Ongoing Care and Maintenance
After sowing, keep the soil consistently moist but not waterlogged to encourage steady germination and prevent roots from becoming woody. A light layer of organic mulch conserves moisture, suppresses weeds, and keeps soil temperatures even. As plants grow, water deeply once or twice a week, providing about an inch of water per week, and remove any weeds that compete for resources.
Pest and Disease Management
Monitor your turnips regularly for common pests such as flea beetles, aphids, and root maggots that can damage foliage and roots. Use floating row covers early in the season, encourage beneficial insects, and remove heavily infested leaves to keep populations in check. Rotate crops annually, avoid planting in areas previously affected by clubroot or related brassica diseases, and ensure good air circulation to minimize fungal issues.
