How Do You Know When To Pick Kohlrabi

You know when to pick kohlrabi by checking its bulb size, aiming for that sweet spot of about 2 to 3 inches in diameter.
 
If you’re staring at your garden wondering, “how do you know when to pick kohlrabi,” the answer really comes down to a combination of timing, size, and a few simple touch tests.
 
Picking kohlrabi at the right moment means the difference between a crisp, mild, apple-like crunch and a woody, peppery disappointment that’s tough to chew.
 
In this post, we’ll dig into exactly how do you know when to pick kohlrabi, what happens if you leave it too long, and the best harvesting tricks to get it perfect every time.
 
Let’s get into it so your next harvest is spot-on delicious.
 

How Do You Know When to Pick Kohlrabi? The Key Signs

The clearest answer to how do you know when to pick kohlrabi is to measure the bulb at its widest point, right above the soil line.
 
Once that bulb reaches golf-ball to tennis-ball size (roughly 2–3 inches across), it’s prime time for harvesting.
 
But size isn’t the only clue, so here are the specific physical signs to look for.
 

1. The Bulb Diameter Is Your Best Guide

When figuring out how do you know when to pick kohlrabi, grab a ruler or just use your hand as a rough gauge.
 
A bulb around 2 inches wide is perfect for most varieties, especially the classic ‘Early White Vienna’ or ‘Kolibri’.
 
If you’re growing a giant variety like ‘Gigante’ or ‘Superschmelz’, you can wait a bit longer, up to 4 or 5 inches, but that’s the exception, not the rule.
 
Checking the bulb diameter weekly is the most reliable way to know when to pick kohlrabi because it grows fast in cool weather.
 

2. Feel the Skin for Firmness

Another trick for how do you know when to pick kohlrabi is to give the bulb a gentle squeeze.
 
A kohlrabi that’s ready to harvest feels rock-solid and dense, with no give at all.
 
If the skin feels spongy or slightly soft, that’s a sign it’s starting to get pithy inside, which means you’ve waited too long.
 
Firmness tells you the flesh is still juicy and crisp, so when you pick kohlrabi at this stage, you’ll get that satisfying snap when you bite into it.
 

3. Check the Leaves for Turgidity

The foliage is another clue when you’re trying to determine how do you know when to pick kohlrabi.
 
Healthy, upright, and vibrant green leaves indicate the plant is still actively pumping moisture into the bulb.
 
Once those leaves start to yellow, droop, or look tired, the bulb has likely stopped growing, and it’s time to harvest immediately.
 
If you see the lower leaves browning but the top still looks fresh, that’s normal, but once the whole plant looks weary, you’ve reached the end of the harvest window.
 

4. Days to Maturity as a Backstop

To know when to pick kohlrabi, check your seed packet for the days to maturity, usually 45 to 60 days from transplant.
 
Mark that date on your calendar as a rough estimate, but don’t rely on it alone.
 
Weather, soil fertility, and water all change the timeline, so a kohlrabi might be ready a week early or a week late.
 
Use the days-to-maturity number as a reminder to start checking daily, but trust the size and firmness tests for the final call.
 

What Happens If You Wait Too Long to Pick Kohlrabi?

Part of learning how do you know when to pick kohlrabi is understanding the downside of waiting.
 
If you pick kohlrabi when the bulb is larger than 4 or 5 inches, the texture changes dramatically.
 
The flesh becomes woody, fibrous, and tough, almost like a radish that’s bolted.
 
Flavor also shifts, getting sharper and more bitter, losing that mild, sweet, broccoli-stem-like quality.
 
Oversized kohlrabi can even crack or split open, especially after a heavy rain following a dry spell, which invites pests and rot.
 
So when you’re unsure how do you know when to pick kohlrabi, err on the side of harvesting a bit early rather than late.
 
Smaller bulbs are always tender and sweet, and you can eat the leaves too, so there’s really no downside to picking at the smaller end of the range.
 

How to Pick Kohlrabi the Right Way

Once you’ve figured out how do you know when to pick kohlrabi, you need to know the best method for actually getting it out of the ground.
 

1. Use a Sharp Knife or Pruners

To pick kohlrabi cleanly, don’t yank or twist the plant, as this damages the roots of neighboring plants.
 
Instead, use a sharp knife or garden pruners to cut the stem just below the bulb, about an inch under the soil surface.
 
This leaves the bulb intact and makes the harvest quick and clean.
 

2. Trim the Leaves Right Away

After you pick kohlrabi, cut off most of the leaves, leaving just a small stub on top.
 
If you leave the leaves attached, they’ll pull moisture out of the bulb, making it shrivel and lose crispness.
 
But don’t toss those leaves, they’re edible and delicious sautéed like collard greens or added to soups.
 
Trimming is a crucial step in knowing how do you know when to pick kohlrabi and then store it properly.
 

3. Store in the Fridge Immediately

Once you pick kohlrabi and trim the leaves, pop the bulbs into a plastic bag in the crisper drawer.
 
They’ll stay fresh for two to three weeks at near-freezing temperatures with high humidity.
 
If you don’t have fridge space, you can store them in a root cellar or a cool, dark basement, but they won’t last as long.
 

How Do You Know When to Pick Kohlrabi for Seeds or Storage?

The answer to how do you know when to pick kohlrabi changes if your goal is seed saving rather than eating.
 
If you want to collect seeds, you’ll need to let the bulb grow much larger and then send up a flower stalk.
 
In that case, pick kohlrabi only after the seed pods have dried and turned brown on the plant, usually late summer or early fall.
 
For long-term winter storage, you can pick kohlrabi a little later, around 3 to 4 inches, since slightly larger bulbs store better.
 
But for eating fresh, stick with the 2-to-3-inch rule, that’s the most reliable way to know when to pick kohlrabi for peak flavor.
 

So, How Do You Know When to Pick Kohlrabi?

How do you know when to pick kohlrabi is really about checking size, firmness, and leaf health on a regular basis.
 
You know to pick kohlrabi when the bulb is 2 to 3 inches across, feels rock-hard, and the plant still looks vibrant and healthy.
 
If you follow those three simple checks, you’ll harvest kohlrabi at its absolute best, tender, sweet, and perfectly crisp.
 
Once you master how do you know when to pick kohlrabi, you’ll never deal with woody or bitter bulbs again.
 
And you’ll wonder why you ever let those beauties overstay their welcome in the garden bed.
 
Happy harvesting, and enjoy that amazing homegrown crunch!