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You know kohlrabi is ready to pick when the bulb at the base of the stem reaches about the size of a tennis ball, typically 2 to 3 inches in diameter.
If you’ve been growing this quirky, alien-looking vegetable in your garden, you’re probably checking it daily and wondering when the exact moment is to harvest it.
The truth is that kohlrabi is ready to pick at a specific stage of growth, and waiting too long or grabbing it too early can make a big difference in texture and taste.
When kohlrabi is ready to pick, the bulb should feel firm and solid with no spongy give when you give it a gentle squeeze.
In this post, we will explore the key signs telling you when kohlrabi is ready to pick, how to harvest it properly, and what happens if you leave it in the ground too long.
Let’s dig in and get that perfect harvest on your plate.
Knowing When Kohlrabi Is Ready To Pick
Figuring out the exact time when kohlrabi is ready to pick isn’t complicated once you know what to look for.
The plant gives you several visual and tactile clues that it has reached its prime harvesting window.
1. Check the Size of the Bulb
The most reliable indicator that your kohlrabi is ready to pick is the size of the swollen stem, which we call the bulb.
For most common varieties, you want to harvest when the bulb is between 2 and 3 inches across.
That’s about the size of a tennis ball or a slightly large egg.
At this size, the kohlrabi is ready to pick because the flesh is still tender, crisp, and sweet.
If you’re growing a giant variety, you can let it get a bit larger, but just know that bigger isn’t always better.
2. Feel the Firmness of the Bulb
When you’re deciding if kohlrabi is ready to pick, give that bulb a gentle squeeze with your thumb and fingers.
A ripe bulb will feel very firm and solid, almost like an apple, with no soft spots or give.
If the bulb feels slightly spongy or has a little bit of flex, it means the interior might be getting woody.
Immature kohlrabi will feel hard but small, while over-mature kohlrabi will start to feel lighter and less dense for its size.
3. Count the Days Since Transplanting
While your calendar isn’t the only clue, it’s a helpful guide to know when kohlrabi is ready to pick.
Most kohlrabi varieties are ready to harvest between 45 and 60 days after you transplant the seedlings outdoors.
If you direct-seeded, add about a week to that timeline.
Around day 45, start checking your plants daily because that’s when they enter their prime picking window.
Within a week or two of hitting that 50-day mark, you can be fairly confident your kohlrabi is ready to pick unless the weather has been very cold or very hot.
4. Leaves Should Still Be Vigorous
Look at the leafy top of the plant to help you know when kohlrabi is ready to pick.
If the leaves are still perky, green, and growing strongly, that’s a good sign the bulb underneath is actively sizing up.
When the lower leaves start yellowing or wilting, that can be a sign the bulb has peaked and may be starting to decline.
Healthy, vibrant leaves on a bulb that’s the right size usually mean your kohlrabi is ready to pick immediately.
5. Avoid Waiting for a Massive Bulb
A common beginner mistake is holding out for a giant bulb, thinking bigger means better.
But if you wait too long to decide when kohlrabi is ready to pick, the bulb will become tough, fibrous, and quite woody inside.
That woody texture is not pleasant to eat, and you’ll be disappointed after all that garden care.
It’s actually better to pick kohlrabi a little early than a little late because the younger, smaller bulbs are incredibly tender.
How To Harvest Kohlrabi When It Is Ready To Pick
Once you’ve confirmed that your kohlrabi is ready to pick, harvesting is a five-minute job that requires minimal tools.
1. Use a Sharp Knife or Pruners
Grab a sharp knife or a pair of garden pruners to snip the stem cleanly.
Cut the main stem about one inch below the bulb, right at the soil line.
Make a single, clean cut rather than twisting or yanking, which can damage the plant’s roots and surrounding soil.
You can leave the roots in the ground to decompose naturally, which feeds your soil for next season.
2. Remove the Leaves Right Away
As soon as you’ve cut the bulb free, trim off the large leaves almost immediately.
If you leave the leaves attached, they’ll continue to pull moisture and nutrients out of the bulb, causing it to shrivel.
Cut the stems back to about half an inch above the bulb itself.
The young, small leaves in the center are edible and quite tasty, so keep those if you like greens.
3. Rinse and Store Your Harvest
Give your freshly picked kohlrabi a quick rinse under cool water to remove any clinging soil.
Pat it dry and store it in a plastic bag in your refrigerator’s crisper drawer.
Properly stored, your kohlrabi can stay fresh and crunchy for two to three weeks.
Just don’t wash it until right before you use it, as excess moisture can encourage mold during storage.
What Happens If Kohlrabi Is Not Ready To Pick
If you’re patient and keep checking, you’ll notice when your kohlrabi is not ready to pick just by looking at it.
Small bulbs under an inch in diameter are simply too immature to harvest because they haven’t developed enough flesh yet.
The skin on immature kohlrabi can also be tougher relative to the tiny amount of edible interior.
If the bulb is still tiny and the leaves are very small, just give it more time and keep it well watered.
Kohlrabi grows quickly, so you’ll see significant size increases every few days during good weather.
The Danger of Over-Mature Kohlrabi
When kohlrabi passes its prime, it becomes what many gardeners call “woody.”
The cells inside the bulb elongate and harden, creating a stringy, fibrous texture that’s unpleasant to bite into.
Even cooking won’t fully rescue an over-mature bulb because the fibers remain tough.
If you accidentally let a bulb get too big, you can still harvest it and peel it very thickly to remove the woody outer layer.
The inner core might still be salvageable, but it won’t have that sweet, delicate crunch you get from a properly timed harvest.
Hot Weather Speeds Up the Clock
Kohlrabi prefers cool weather, so if a heatwave hits, it will rush to mature and bolt.
When kohlrabi bolts, it sends up a flower stalk, and the bulb immediately becomes tough and bitter.
That’s your signal that you waited too long, and the kohlrabi is no longer ready to pick for eating.
In hot climates, you often have a much shorter window to harvest, so check daily when temps spike.
So, How Do You Know When Kohlrabi Is Ready To Pick?
You know kohlrabi is ready to pick when the bulb is about 2 to 3 inches wide, feels rock solid to the touch, and has vibrant green leaves on top.
The ideal harvesting period is roughly 45 to 60 days after transplanting, so keep an eye on that calendar as well.
When in doubt, pick it on the smaller side because young kohlrabi is always tender and delicious.
Once you’ve harvested at the right moment, you’ll be rewarded with a crisp, mildly sweet, and incredibly versatile vegetable that’s perfect for salads, slaws, or roasting.
Now you know exactly when to pull that funky-looking bulb from your garden bed.
Happy growing, and enjoy every crunchy bite of your perfectly timed kohlrabi harvest.