Turnip Seeds – Brassica rapa subsp. rapa

Turnips are cool season vegetables that thrive when the soil temperature sits between 50 and 65 degrees Fahrenheit. For spring, sow as soon as the ground can be worked and nighttime temperatures are no longer deeply frozen. For fall gardens, count back about 60 days from your first expected frost and sow then, since the roots actually develop more sweetness as cool autumn temperatures arrive.

Sow turnip seeds at a depth of about one quarter to one half inch, keeping in mind that very shallow planting can leave seeds vulnerable to drying out before germination. Press the seed row gently after sowing to ensure good contact with the soil, then water carefully to avoid washing seeds out of position. Germination outcomes vary based on soil temperature, moisture levels, and overall growing conditions.

Most turnip varieties are ready to harvest in 45 to 60 days from sowing, though some faster types can produce baby turnips in as little as 35 to 40 days if you prefer smaller, more tender roots. The greens can be harvested much earlier, often within 3 to 4 weeks of germination. Checking root size at the soil line by gently brushing away a little soil is the most reliable way to judge readiness.

Turnips can be grown in containers, but they need more depth than most people expect, with a pot at least 12 inches deep being the practical minimum for decent root development. Choose a wide container to allow you to space multiple plants 4 to 6 inches apart, and be prepared to water more frequently since containers dry out faster than garden beds. If container space is limited, focus on growing turnips primarily for their greens, which are far less demanding in terms of root depth.

The two most common culprits are harvesting too late and inconsistent watering. Roots left to grow much larger than 3 inches tend to become pithy and develop a sharp, bitter edge that cooking does not fully correct. Heat stress during the growing season also concentrates glucosinolates in the roots, which contributes to bitterness, so timing your crop to mature in cooler weather makes a noticeable difference in flavor.

Turnip greens are absolutely edible and have a long history as a kitchen staple in Southern cooking, European peasant cuisine, and beyond. Young leaves are mild enough to eat raw in salads, while older leaves have a pleasant bitterness that mellows when sauteed with garlic or braised. Because you get both root vegetables and nutritious greens from a single sowing, turnips offer genuinely good value in a small garden space.

Turnips grow well in soil with a pH between 6.0 and 7.0, which is a slightly acidic to neutral range that most garden soils already fall within. If your soil is more acidic than that, working in a small amount of garden lime before planting can help. Very alkaline soils above pH 7.5 can interfere with nutrient uptake and tend to produce poor root development, so a basic soil test is worth doing if your Brassica crops have struggled in the past.