Illinois soils warm slowly in spring, making fall turnip crops particularly reliable. Knowing the best time to plant turnip in illinois is the key to a successful harvest, whether you’re a beginner or a seasoned gardener.
Turnips are a cool-season crop that thrives in the moderate temperatures of spring and fall. In Illinois, the timing is everything because the weather can shift quickly.
This guide will walk you through the exact planting windows, soil preparation, and care tips. You’ll learn how to avoid common mistakes and enjoy a bumper crop of tender, sweet turnips.
Best Time To Plant Turnip In Illinois
The best time to plant turnip in illinois depends on whether you want a spring or fall harvest. For spring planting, aim for late March to early April, as soon as the soil can be worked. For fall planting, the ideal window is from late July to mid-August.
Fall turnips are often sweeter because the cooler temperatures convert starches to sugars. Spring turnips can be more prone to bolting if the weather heats up too fast.
Here is a simple breakdown of planting dates by region in Illinois:
- Northern Illinois: Spring: April 1–15; Fall: July 20–August 5
- Central Illinois: Spring: March 25–April 10; Fall: August 1–15
- Southern Illinois: Spring: March 15–April 1; Fall: August 10–25
These dates are guidelines. Always check your local frost dates and soil temperature. Turnip seeds germinate best when the soil is between 50°F and 75°F.
Why Fall Planting Is Often Better In Illinois
Illinois summers can be hot and humid. Spring-planted turnips often struggle with heat stress and pests like flea beetles. Fall planting avoids these issues.
The soil in late summer is warm, which helps seeds germinate quickly. As the weather cools, turnip roots develop slowly, resulting in a milder flavor.
Another advantage is that fall turnips can be stored in the ground under a layer of mulch. You can harvest them well into November or even December in mild years.
Spring Planting Tips For Illinois Gardeners
If you prefer a spring harvest, timing is critical. Plant too early and the seeds may rot in cold, wet soil. Plant too late and the roots become woody and bitter.
Follow these steps for spring success:
- Test your soil temperature with a thermometer. Wait until it reaches at least 40°F at a depth of 2 inches.
- Prepare the bed by removing rocks and debris. Turnips prefer loose, well-drained soil.
- Sow seeds ½ inch deep and 1 inch apart in rows spaced 12–18 inches apart.
- Water gently after planting to settle the soil.
- Thin seedlings to 4–6 inches apart when they are 2–3 inches tall.
Spring turnips are ready to harvest in 45–60 days. Pull them when the roots are 2–3 inches in diameter for the best texture.
Common Spring Planting Mistakes
Many gardeners plant too early. If the soil is too cold, seeds may not germinate for weeks. This can lead to uneven stands and poor yields.
Another mistake is skipping thinning. Crowded turnips produce small, misshapen roots. Thin early to give each plant room to grow.
Finally, don’t forget to water consistently. Turnips need about 1 inch of water per week. Inconsistent watering can cause roots to crack.
Fall Planting Tips For Illinois Gardeners
Fall planting is more forgiving than spring. The soil is warm, so seeds germinate in 5–10 days. The key is to plant early enough so the roots mature before a hard freeze.
Here is a step-by-step guide for fall turnips:
- Choose a site that gets full sun. Turnips need at least 6 hours of direct sunlight daily.
- Amend the soil with compost or well-rotted manure. Turnips prefer a pH between 6.0 and 7.0.
- Sow seeds ½ inch deep and 1 inch apart. You can also broadcast them and thin later.
- Water deeply after planting. Keep the soil moist until seedlings emerge.
- Mulch around the plants to retain moisture and suppress weeds.
- Thin to 4–6 inches apart when seedlings are 2–3 inches tall.
Fall turnips can be left in the ground after the first frost. Cover them with a thick layer of straw or leaves to protect from freezing.
Harvesting Fall Turnips
Fall turnips are ready 50–70 days after planting. The roots are usually sweeter after a light frost. Harvest them when they are 2–4 inches in diameter.
To harvest, loosen the soil with a garden fork and pull gently. Remove the tops immediately to prevent moisture loss. Store roots in a cool, dark place for up to 3 months.
Don’t forget the greens! Turnip greens are nutritious and can be harvested when they are 4–6 inches tall. Leave some leaves on the plant to continue feeding the root.
Soil Preparation For Turnips In Illinois
Turnips are not heavy feeders, but they do need loose, fertile soil. Heavy clay soil can cause roots to become stunted or forked.
Start by testing your soil pH. Turnips prefer a slightly acidic to neutral pH. Add lime if the pH is below 6.0, or sulfur if it’s above 7.0.
Work the soil to a depth of 8–10 inches. Remove any large stones or clods. Turnips need consistent moisture, so consider adding organic matter to improve water retention.
Here are some soil preparation tips:
- Add 2–3 inches of compost before planting.
- Use a balanced fertilizer like 10-10-10 at a rate of 1 pound per 100 square feet.
- Avoid fresh manure, which can cause forked roots.
- Rake the bed smooth before sowing seeds.
Choosing The Right Turnip Variety For Illinois
Not all turnip varieties perform well in Illinois. Some are better for spring, while others excel in fall. Choose based on your planting season.
For spring planting, look for quick-maturing varieties that tolerate heat. Good options include:
- Purple Top White Globe – classic variety, matures in 55 days
- Tokyo Cross – hybrid, matures in 35 days, very tender
- White Egg – heirloom, matures in 50 days, mild flavor
For fall planting, choose varieties that store well and handle frost. Recommended varieties include:
- Golden Ball – yellow flesh, sweet, matures in 60 days
- Gilfeather – heirloom, creamy white, matures in 70 days
- Shogoin – good for greens and roots, matures in 45 days
Seed Starting Tips
Turnips are almost always direct-seeded. They do not transplant well because the taproot is sensitive. Sow seeds directly in the garden.
If you want an early start, you can plant seeds in a cold frame or under row covers. This can extend your spring season by 2–3 weeks.
For fall planting, you can also use succession planting. Sow a new row every 2 weeks from late July to early September for a continuous harvest.
Watering And Fertilizing Turnips
Consistent moisture is the secret to tender turnips. If the soil dries out, the roots become tough and bitter. Aim for 1 inch of water per week from rain or irrigation.
Water deeply once or twice a week rather than shallowly every day. This encourages deep root growth. Use a soaker hose or drip irrigation to keep foliage dry and prevent disease.
Fertilize sparingly. Too much nitrogen can cause lush tops but small roots. Side-dress with a low-nitrogen fertilizer like 5-10-10 when the plants are 4 inches tall.
Here is a simple fertilizing schedule:
- At planting: apply a balanced fertilizer
- At thinning: side-dress with a phosphorus-rich fertilizer
- Every 3 weeks: water with a liquid seaweed solution
Pest And Disease Management In Illinois
Turnips are relatively pest-free, but a few common problems can occur in Illinois. Flea beetles are the most common pest, especially in spring.
Flea beetles create small holes in the leaves. They are most active in warm, dry weather. Control them with row covers or insecticidal soap.
Other pests include aphids, root maggots, and cabbage worms. Rotate crops each year to reduce pest pressure. Avoid planting turnips where other brassicas grew the previous season.
Diseases like clubroot and black rot can occur in wet soil. Ensure good drainage and avoid overhead watering. Remove any diseased plants immediately.
Companion Planting For Turnips
Companion planting can help deter pests and improve growth. Good companions for turnips include:
- Peas and beans – fix nitrogen in the soil
- Onions and garlic – repel aphids and flea beetles
- Mint and rosemary – deter cabbage moths
Avoid planting turnips near other brassicas like cabbage or broccoli. They compete for nutrients and attract the same pests.
Harvesting And Storing Turnips
Turnips are ready to harvest when the roots are 2–3 inches in diameter. Larger roots can become woody and lose flavor. Harvest promptly for the best quality.
Use a garden fork to loosen the soil, then pull the roots by the tops. Remove the greens within an hour of harvesting to prevent moisture loss.
Store turnips in a cool, humid place. A root cellar or refrigerator works well. They can last for 2–3 months at 32°F and 95% humidity.
Here are storage tips:
- Do not wash before storing. Brush off excess soil.
- Place in perforated plastic bags or a container with damp sand.
- Check regularly for soft spots or rot.
- Greens can be stored separately in a plastic bag for up to a week.
Using Turnips In The Kitchen
Turnips are versatile in the kitchen. They can be eaten raw, roasted, mashed, or pickled. The greens are also edible and packed with vitamins.
For a simple side dish, roast turnips with olive oil, salt, and pepper at 400°F for 25–30 minutes. They become caramelized and sweet.
You can also add raw turnips to salads for a crunchy texture. Or mash them with potatoes for a creamy, low-carb alternative.
Frequently Asked Questions
Can I plant turnips in Illinois in June?
June is generally too late for spring planting and too early for fall planting. The heat will cause turnips to become woody and bitter. Stick to the recommended spring and fall windows.
How late can I plant turnips in Illinois for a fall harvest?
You can plant turnips as late as early September in southern Illinois, but the roots may be small. For best results, plant by mid-August in most areas. Check your first frost date and count back 60 days.
Do turnips need full sun in Illinois?
Yes, turnips need at least 6 hours of direct sunlight daily. Partial shade can result in smaller roots and leggy greens. Choose a sunny spot in your garden.
What is the best soil temperature for planting turnips?
Turnip seeds germinate best when the soil is between 50°F and 75°F. Soil that is too cold or too hot will reduce germination rates. Use a soil thermometer for accuracy.
Can I grow turnips in containers in Illinois?
Yes, turnips can be grown in containers at least 12 inches deep. Use a loose, well-draining potting mix. Water frequently, as containers dry out faster than garden beds.
Final Thoughts On Planting Turnips In Illinois
Knowing the best time to plant turnip in illinois is the first step to a successful harvest. Whether you choose spring or fall, timing and soil preparation are key.
Fall planting is generally more reliable in Illinois due to the cooler temperatures and fewer pests. But spring planting can work if you plant early and watch the weather.
Remember to water consistently, thin your seedlings, and harvest at the right size. With a little care, you’ll enjoy fresh, homegrown turnips from your garden.
So grab your seeds, check the calendar, and get planting. Your taste buds will thank you.