When To Plant Turnips In Indiana

If you’re planning your Indiana garden, knowing when to plant turnips is key to a great harvest. This cool-season crop thrives in our state’s climate, but timing is everything to get those sweet roots and tender greens. Let’s break down the best planting windows and how to make your turnip patch a success.

For most of Indiana, you have two main planting seasons: spring and fall. Turnips prefer cool weather and can even handle a light frost, which actually makes them taste sweeter. Planting at the wrong time leads to poor root development or the plants bolting (flowering) too soon.

Spring Planting Dates

Get your spring turnip seeds in the ground early. You want them to mature before the heat of summer sets in.

Southern Indiana: Plant from late March to mid-April.
Central Indiana: Aim for early to late April.
Northern Indiana: Wait until mid-April to early May.

A good rule is to sow seeds as soon as the soil can be worked, about 2-4 weeks before your last average spring frost date. The soil temperature should be at least 40°F.

Fall Planting Dates

Fall is often the best and easiest time for growing turnips in Indiana. The cooling temperatures are ideal.

For a late fall harvest: Plant seeds in late July to early August.
For a storage harvest: Aim for early to mid-August.
For a spring harvest: You can even plant in very late September for roots that will overwinter and be ready in early spring.

Count backwards from your first average fall frost date. Plant seeds about 6-10 weeks before that date for the main crop.

Understanding Indiana’s Growing Zones

Indiana spans USDA plant hardiness zones 5b through 6b. This affects your exact timing.

Zone 5b (Northern parts): Frost dates are later in spring and earlier in fall. Stick to the later side of planting ranges.
Zone 6b (Southern parts): You have a longer window and can plant a bit earlier in spring and later in fall.
Zone 6a (Central region): This is the average for the state, following the central Indiana dates is usually safe.

Always check your local frost dates for the most accurate planning. Your county’s extension office is a great resource.

Preparing Your Soil for Turnips

Turnips need loose, well-draining soil to form nice round roots. Heavy clay or rocky soil will cause misshapen growth.

Choose a Sunny Spot: Pick a location that gets full sun, at least 6 hours of direct light daily.
Loosen the Soil: Till or dig the area to a depth of 12-15 inches. Break up any large clumps.
Amend the Soil: Mix in 2-3 inches of compost or aged manure. This improves drainage and fertility.
Check the pH: Turnips like a slightly acidic to neutral soil pH, between 6.0 and 7.0. A simple test kit can tell you if you need to adjust it.
Fertilize Lightly: Avoid high-nitrogen fertilizers, which promote leafy greens at the expense of the root. A balanced 10-10-10 mix worked into the soil before planting is sufficient.

How to Plant Turnip Seeds

Turnips are grown directly from seed sown in the garden. They don’t transplant well.

Sow Seeds: Plant seeds about ½ inch deep. Space them 1 inch apart in rows that are 12-18 inches apart.
Water Gently: Keep the seedbed consistently moist until seedlings emerge, which takes 4-7 days.
Thin Seedlings: This is a crucial step! Once seedlings are 3-4 inches tall, thin them to stand 4-6 inches apart. Crowded turnips won’t develop properly. You can eat the thinned greens.

Caring for Your Turnip Plants

Once established, turnips are relatively low-maintenance.

Watering: Provide about 1 inch of water per week. Consistent moisture is vital for tender roots. Mulching helps retain soil moisture and suppress weeds.
Weeding: Keep the area weed-free, especially when plants are young. Weeds compete for nutrients and water.
Pest Watch: Watch for flea beetles and cabbage root maggots. Row covers can provide excellent protection. Crop rotation from year to year also helps prevent pest and disease buildup.

Harvesting Your Indiana Turnips

You can actually harvest turnips at two stages.

For Greens: You can start snipping young, tender leaves when they are 4-6 inches tall. Never take all the leaves from one plant if you want a root to form.
For Roots: Most varieties are ready 45-60 days after planting. Harvest when roots are 2-3 inches in diameter for the best flavor. They can get woody if left to grow too large.

For fall turnips meant for storage, you can leave them in the ground through several frosts. Harvest them all before the ground freezes solid. Twist off the tops, leaving about an inch of stem, and store the roots in a cool, humid place like a root cellar or refrigerator.

Recommended Turnip Varieties for Indiana

Choosing the right variety can make a difference.

Purple Top White Globe: A classic, reliable variety with great storage qualities.
Hakurei: A sweet, salad-type turnip best harvested small. Excellent for spring and fall.
Scarlet Queen: Has vibrant red shoulders and stays tender even when larger.
Seven Top: Grown primarily for its abundant, flavorful greens.

Common Problems and Solutions

Even easy crops have issues sometimes. Here’s what to look for.

Bolting: If your plant sends up a flower stalk, it’s usually due to planting too late in spring or a sudden warm spell. The root becomes tough. Focus on fall planting or use bolt-resistant varieties for spring.
Woody Roots: Caused by heat, lack of water, or letting them grow too big. Stick to the planting calendar and harvest on time.
Poor Root Formation: Often caused by crowded plants, heavy soil, or excessive nitrogen. Remember to thin seedlings and prepare your soil well.

Frequently Asked Questions

Can you plant turnips in the summer in Indiana?

It’s not recommended. Summer heat causes turnips to become bitter, woody, and bolt quickly. The main planting seasons are spring and fall.

How late can you plant turnips in Indiana?

For a fall harvest, aim to get seeds in the ground by mid-August. For a overwintering crop that you harvest in early spring, you can plant in very late September.

Do turnips come back every year?

No, turnips are biennials grown as annuals. They complete their life cycle (seed to root to seed) over two growing seasons, but we harvest them in the first year for the root.

What are good companion plants for turnips?

Good neighbors include peas, beans, and onions. Avoid planting them near other root crops like potatoes or close to mustard greens, as they can attract the same pests.

Getting your turnip planting timing right in Indiana is simple once you know the two key windows. By following these spring and fall schedules and giving your plants basic care, you’ll be rewarded with a productive harvest of this versatile vegetable. Remember, the sweetest turnips often come from the fall garden, after a kiss of frost.