When to Sow Turnips for Best Results
Sowing turnips is best undertaken during specific periods to maximise your chances of a successful harvest. For maincrop varieties, the ideal time is typically from early spring, once the soil has warmed sufficiently and the risk of hard frost has passed, through to mid-summer. Late sowings in late summer can also yield a good crop, often with sweeter roots. Spring-sown turnips mature more quickly, whereas summer-sown crops tend to be larger and store better.
- Spring sowing from March/April for quick crops.
- Summer sowing for larger, storable roots.
- Avoid sowing in the hottest summer months.
- Ensure soil is free from hard frost.
Turnips are a cool-season crop, meaning they perform best when not subjected to extreme heat. While they can be sown as soon as the soil is workable in spring, typically around March or April in many temperate climates, pushing this too early can lead to stunted growth if cold snaps persist. The period from April through to June is often considered prime time for spring and early summer crops. For a continuous harvest, consider sowing small batches every two to three weeks.
Later sowings in late July or August can produce excellent results, especially for varieties intended for storage over winter. These crops benefit from milder autumn temperatures, allowing them to mature fully without bolting (going to seed) prematurely, which can be triggered by heat stress. However, avoid sowing too late into autumn; roots need sufficient time to develop before the ground becomes too cold or freezes.
Considering Soil Temperature for Sowing
The soil temperature is a critical factor for successful germination. Turnip seeds generally require soil temperatures of at least 5°C (41°F) to germinate reliably, but ideally, they prefer slightly warmer conditions, around 10-20°C (50-68°F). In cooler regions, using cloches or fleece covers can help warm the soil earlier in spring, extending the sowing window. This protective covering can also deter early pests, such as flea beetles, which can decimate young seedlings.
For summer sowings, particularly in hotter climates, choosing a slightly shadier spot or sowing towards the end of the typical summer sowing window can prevent the plants from suffering heat stress. This also helps maintain soil moisture, which is vital for quick root development and to prevent the roots from becoming woody or developing a pungent flavour.
The success of your turnip harvest hinges on aligning sowing times with the plant's preference for cool, moist conditions, avoiding extremes of heat and frost.
Start a few seeds indoors in modules a week or two before your planned outdoor sowing date, especially if you're concerned about early pest damage or unpredictable weather. Transplant the young seedlings carefully once they have a couple of true leaves.
Timing is everything when planning your turnip crop. By carefully considering the variety of turnip you are growing and your local climate, you can pinpoint the optimal window for sowing seeds to ensure a bountiful yield.
Preparing the Ground and Sowing Turnip Seeds
To achieve healthy turnip plants, preparing the soil correctly is paramount. Turnips thrive in well-drained, fertile soil that is relatively free of stones, which can distort root development. It's beneficial to cultivate the soil to a depth of at least 15-20cm (6-8 inches). Incorporating well-rotted compost or manure from the previous autumn is ideal, as fresh manure can encourage hairy roots and affect the flavour of the crop.
Before sowing, rake the soil surface to a fine tilth, breaking up any large clods. This fine, crumbly surface is essential for ensuring good seed-to-soil contact, which aids germination. If your soil is heavy clay, adding grit or sand can improve drainage, while lighter, sandy soils may benefit from organic matter to improve water retention. Ensuring the soil pH is neutral to slightly acidic (around 6.0-7.0) also supports good growth.
Sowing Methods for Turnips
There are two primary methods for sowing turnips: direct sowing into the ground or starting them indoors in modules, though direct sowing is far more common and recommended for this crop. For direct sowing, you can either sow seeds thinly in rows or broadcast them over a prepared bed and then thin the seedlings later.
Direct Sowing in Rows: Draw shallow drills 1-2cm (about half an inch) deep. For smaller varieties, space rows 20-30cm (8-12 inches) apart. For larger, maincrop varieties, you may need 30-45cm (12-18 inches) between rows. Sow the seeds thinly along the drill. Once germinated, you will need to thin the seedlings to the final spacing. For small to medium turnips, aim for 10-15cm (4-6 inches) between plants. For larger varieties, allow 20-30cm (8-12 inches).
Broadcasting: If you are sowing over an entire bed, scatter the seeds very thinly and evenly across the surface. Then, gently rake them into the top layer of soil, ensuring a shallow burial of no more than 1-2cm. This method requires careful thinning to achieve the correct final spacing for the plants.
Thinning: This is a crucial step that many gardeners overlook. Once the seedlings have developed their first set of true leaves, thin them out to the recommended spacing. It's best to do this on a dull day or in the evening to minimise transplant shock. You can gently pull out the excess seedlings by hand or use a small trowel. The thinnings can often be eaten as tasty microgreens or added to salads, providing an early bonus crop.
For those interested in propagating other vegetables, the principles of seed preparation and soil moisture are similar, whether you are sowing bulbs, vegetable seeds like carrots or radishes, or even attempting to grow fruit from seed like how to plant lemon seeds. The key is ensuring good seed-to-soil contact and adequate, consistent moisture.
Choose the right turnip variety for your needs, considering both maturity time and intended use, whether for fresh eating or storage.
Caring for Your Turnip Seedlings and Mature Plants
Once your turnip seeds have germinated and been thinned, ongoing care is essential to ensure healthy growth and prevent issues. Consistent moisture is one of the most critical factors for growing good turnips. Irregular watering can lead to tough, woody roots and a peppery taste, particularly during dry spells. Aim to keep the soil consistently moist but not waterlogged.
Water deeply and regularly, especially during dry periods. Applying a mulch of straw or compost around the plants can help conserve soil moisture, suppress weeds, and keep the soil cool during warmer months. This is especially beneficial for summer-sown crops.
Pest and Disease Management
Turnips can be susceptible to several pests and diseases. The most common pest is the flea beetle, which can create small, shot-hole-like perforations in the leaves of young seedlings. If infestation is severe, seedlings can be completely destroyed. Row covers or horticultural fleece are effective physical barriers to prevent flea beetles from reaching young plants. For more established plants, they are usually resilient enough to withstand minor damage.
Other potential issues include cabbage root fly, which can target the roots, and various fungal diseases like downy mildew, especially in damp conditions. Ensuring good air circulation, proper spacing, and avoiding waterlogged soil can help mitigate these disease risks. Crop rotation is also vital; avoid planting turnips or other brassicas in the same spot for at least three to four years to break pest and disease cycles.
When it comes to propagation, understanding the specific needs of each plant is crucial. While sowing seeds into seed compost for vegetables like turnips is standard, propagating plants from cuttings or runners, as you might with certain flowers or fruit-bearing bushes, requires different techniques. For instance, if you were learning how to plant an apple seed, the process would involve different seed stratification requirements than sowing simple vegetable seeds.
Harvesting Your Turnips
Turnips are typically ready to harvest from 6 to 10 weeks after sowing, depending on the variety and growing conditions. You can start harvesting when the roots reach your desired size. For tender, young turnips, harvest them when they are about 5-7cm (2-3 inches) in diameter. If left to grow too large, they can become fibrous and less palatable. Check the specific maturity time stated on your seed packet for guidance.
To harvest, loosen the soil around the turnip with a fork or trowel, then gently pull the root from the ground. It's often easier to harvest on a dry day. If you are expecting a period of hard frost, it is advisable to lift any remaining turnips and store them in a cool, frost-free place, such as a root cellar or a cool shed, though many varieties will overwinter in the ground if mulched heavily. Remember, the meaning of sowing extends beyond just planting; it encompasses the entire lifecycle of the plant from seed to harvest.
Pay attention to the size and appearance of the roots to determine the ideal time for harvesting your turnip crop.
Turnip Varieties and Their Uses
The world of turnips offers a diverse range of varieties, each suited to different growing conditions, harvest times, and culinary purposes. Understanding these differences can help you select the best turnips for your garden and kitchen. Broadly, they can be categorised by their maturity period – early, mid, or late season – and their typical use, such as for spring greens, fresh salad roots, or winter storage.
Early Varieties: These are often quicker to mature, typically ready within 6-8 weeks. They are excellent for spring sowing and provide tender, small roots ideal for fresh consumption. Examples include 'Milan' types, which are often flattened and very fast-growing, and 'Snowball', a classic round, white variety. They are less suited for long-term storage but offer an early taste of homegrown produce. Their leaves are also edible and can be harvested when young.
Maincrop Varieties: Maturing in around 8-10 weeks, maincrop turnips are larger and more robust. Varieties like 'Amberling' or 'Purple Top White Globe' are popular choices. These are versatile and can be harvested at various sizes. Larger roots are well-suited for roasting, mashing, or adding to stews, while smaller, younger roots from these varieties can also be eaten raw. Many maincrop types also store reasonably well.
Winter/Storage Varieties: Some varieties are specifically bred for long-term storage and can be sown later in the summer for harvesting before the first hard frosts. These tend to be larger and have a slightly tougher skin. Examples might include certain 'Long White' types or those bred for hardiness. They require a slightly longer growing season and can be stored in cool, dark conditions for several months, providing a valuable root vegetable supply through winter.
Culinary Uses for Turnips
Turnips are remarkably versatile in the kitchen. Young, tender turnips are delicious eaten raw, perhaps thinly sliced into salads or grated into slaws, offering a crisp texture and a mild, slightly peppery flavour. Roasting brings out their natural sweetness, making them a superb accompaniment to roasted meats or as part of a vegetable medley. They can also be boiled and mashed, either on their own or mixed with potatoes, parsnips, or swede.
The greens of turnip plants are also highly nutritious and edible. Often referred to as turnip tops or turnip greens, they can be cooked like spinach or kale – steamed, sautéed, or added to soups and stews. Harvesting the greens from larger plants can encourage better root development, and using them provides an additional yield from your sowing efforts. This dual-purpose nature makes turnips an efficient crop for any vegetable garden.
When comparing different vegetable seeds, consider the mature size and growth habit. For example, while sowing seeds for root vegetables like turnips focuses on underground development, how to grow mango from seed involves very different germination requirements and plant structures.
Consider how you intend to use your turnips – fresh, cooked, or stored – when selecting varieties to sow.