The size of the crown peeking above the soil line tells you exactly when turnips have reached their peak sweetness and tenderness. Knowing when to pick turnips is the difference between a crisp, mild root and a woody, bitter disappointment. You don’t need a calendar or a fancy tool, just your eyes and a quick check of the soil.
Most gardeners pull turnips too late, thinking bigger is better. That is the biggest mistake you can make with this fast-growing crop. The perfect turnip is often much smaller than you expect, usually no larger than a golf ball or a tennis ball.
Why Size Matters More Than Days
Seed packets often list a “days to maturity” number, like 45 or 60 days. That is a helpful guideline, but it is not a guarantee. Weather, soil fertility, and watering habits all change the growth rate. A turnip might reach full size in 30 days in warm weather, or it might take 70 days in a cool, slow spring.
Instead of counting days, you should measure the crown. The crown is the top of the root that pushes up out of the dirt. It is your direct window into the turnip’s condition. When that crown hits the right size, the whole root is ready, regardless of the date on the calendar.
Ideal Sizes For Different Uses
Different recipes call for different turnip sizes. You do not have to wait for one specific size if you want variety. Here is a simple breakdown of what size works best for what purpose:
- Baby turnips (1 to 1.5 inches): These are the sweetest and most tender. They are perfect for eating raw in salads, roasting whole, or pickling. The skin is thin and does not need peeling.
- Standard turnips (2 to 3 inches): This is the classic size for cooking. They hold up well in stews, soups, and mashes. The flavor is still mild, but the texture is firmer.
- Large turnips (3 inches and up): These are usually too woody and pungent for most people. They are best used for livestock feed or heavy soups where they will cook for a long time. The skin is thick and must be peeled deeply.
If you are unsure, err on the side of smaller. A small turnip is rarely a letdown. A large turnip is often a gamble that does not pay off.
When To Pick Turnips: The Visual Cues
You need to look at the shoulder of the root. The shoulder is the part of the turnip that rises above the soil line. It should be smooth, firm, and have a vibrant color. If the shoulder looks cracked, it means the turnip has been growing too fast and may be pithy inside.
Another cue is the greens. The leaves should be green and upright. If the leaves start to yellow or wilt at the edges, the root has likely stopped growing and is starting to degrade. The greens are also edible, so you can harvest a few leaves without pulling the root, but do not strip the plant entirely.
How To Check Without Pulling
You do not want to pull every turnip just to check its size. That disturbs the soil and can break the roots of neighboring plants. Instead, use this simple method:
- Brush away the top layer of soil around the crown with your fingers.
- Measure the diameter of the exposed root with a small ruler or just your fingers.
- If it feels like the size you want, gently wiggle the top to see if it is firm.
- If it is still too small, push the soil back over the crown and wait a few days.
This method takes ten seconds and saves you from guessing. You can check a few different turnips in the row to get an average size, since they do not all mature at the exact same time.
Harvesting In Stages
You do not have to harvest all your turnips on the same day. In fact, you should not. Harvesting in stages gives you a continuous supply of perfect roots. Start pulling the largest ones first, even if they are only slightly larger than the rest. This gives the smaller ones more room and nutrients to grow.
When you pull a turnip, grasp the greens firmly at the base and pull straight up. If the soil is compacted, use a garden fork to loosen the soil around the root first. Pulling too hard can snap the root off in the ground, leaving you with a hole and no turnip.
What To Do With The Greens
Do not throw the greens away. They are highly nutritious and taste like a cross between spinach and mustard greens. Cut the greens off about one inch above the root. If you leave the greens attached, they will draw moisture out of the root and make it shrivel quickly.
You can store the greens separately in a plastic bag in the fridge for up to three days. The roots, if unwashed and kept in a cold, dark place, can last for several weeks. Do not wash the roots until you are ready to use them, as moisture encourages rot.
Seasonal Timing: Spring Vs. Fall
Turnips are a cool-season crop. They do not like hot weather. The flavor changes dramatically based on the temperature. In the spring, you want to harvest before the heat of summer arrives. In the fall, you can let them sit in the ground longer because the cold weather converts starches to sugars, making them sweeter.
For a spring crop, you should pick turnips as soon as they reach the desired size, even if they are small. As soon as the daytime temperatures consistently hit 75°F, the turnips will start to turn bitter and fibrous. Do not wait for them to grow larger.
Fall Harvesting And Frost
Fall turnips are the best tasting. A light frost actually improves their flavor. The cold triggers the plant to pump sugars into the root as a natural antifreeze. You can leave fall turnips in the ground much longer than spring turnips.
However, a hard freeze is a problem. If the ground freezes solid, the turnips will turn to mush. You need to harvest them before the soil freezes hard. In many climates, that means pulling them in late October or early November, before the ground gets rock solid.
If you live in a mild climate, you can mulch heavily with straw and leave them in the ground all winter. This is called “overwintering.” You just dig them up as needed. But this only works if your ground does not freeze deeper than a few inches.
Storing Your Harvest
Proper storage is just as important as the harvest timing. If you pick turnips at the perfect size but store them wrong, they will lose their crunch and flavor fast. The ideal storage condition is just above freezing with very high humidity.
A root cellar is the best option, but a refrigerator works fine for smaller amounts. Remove the greens, brush off the loose soil, and place the roots in a perforated plastic bag. Do not seal the bag completely, as they need some air circulation.
Signs Of Spoilage
You should check your stored turnips every week. Look for soft spots, mold, or a slimy texture. If one turnip starts to rot, it will quickly spread to the others. Remove any bad ones immediately. A good turnip should feel rock hard and heavy for its size.
If your turnips start to sprout leaves in storage, that means they are too warm. Eat them quickly, as they will become spongy. You can also blanch and freeze turnips, but they will lose some of their crisp texture. Freezing is best for turnips you plan to mash or add to soups.
Common Mistakes To Avoid
There is a learning curve with turnips. Even experienced gardeners make mistakes. Here are the most common errors people make when deciding when to pick turnips:
- Waiting for “full size”: The size on the seed packet is the maximum, not the ideal. Pull them smaller.
- Ignoring the weather: A sudden heat wave can ruin a crop in days. Harvest immediately if hot weather is forecast.
- Pulling by the leaves: This often breaks the root. Always loosen the soil first.
- Leaving them too long in spring: Spring turnips do not get sweeter with age. They only get hotter and woodier.
- Not thinning seedlings: Crowded turnips cannot form proper roots. Thin them to 4 inches apart early.
If you avoid these mistakes, you will have a much better harvest. The key is to be proactive, not reactive. Check your turnips every few days, especially when they start to approach the expected size.
Frequently Asked Questions
Can you eat turnips that are too big?
You can eat them, but they will be tough and pungent. You can salvage them by peeling very thickly and cooking them for a long time in stews. However, they will never taste as good as smaller ones.
How do you know if a turnip is sweet?
Sweetness is directly linked to size and temperature. Smaller turnips are sweeter. Fall turnips that have experienced a light frost are the sweetest of all. Look for firm, smooth skin without cracks.
Should you wash turnips before storing?
No. Do not wash them until you are ready to eat them. Washing removes the natural protective layer and introduces moisture, which causes rot. Just brush off the dry soil.
Can you leave turnips in the ground after they mature?
Yes, in the fall you can leave them in the ground for several weeks, especially after a frost. They will hold their quality. But in the spring, leaving them in the ground causes them to become bitter and woody quickly.
What happens if you harvest turnips too early?
Nothing bad happens. They will just be smaller. You can eat them raw or cooked. Baby turnips are a delicacy. The only downside is a slightly lower yield per plant.
Final Harvest Checklist
Before you go out to the garden, run through this quick checklist. It will help you make the right call every time you are wondering when to pick turnips.
- Measure the crown diameter with your fingers.
- Compare it to the size you want for your recipe.
- Check the forecast for any extreme weather changes.
- Feel the shoulder of the root for firmness.
- Look at the greens for signs of yellowing or wilting.
- If in doubt, pull one and test it.
That last point is the most important. Pulling one test turnip is the only way to be 100% sure. If it is perfect, harvest the rest at the same size. If it is too small, wait a few more days. If it is bitter, you waited too long, and you should harvest everything immediately before it gets worse.
Turnips are forgiving, but they do not wait for you. A few days of neglect can be the difference between a sweet, crunchy root and a woody, inedible one. Check your garden regularly, trust your eyes over the calendar, and you will always pick them at the right moment. The reward is a crisp, mildly spicy root that is a joy to cook with and eat.