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You know celery is done growing when the stalks reach their full size, the leaves are dark green, and the plant stops putting out new growth at the center.
Celery is a slow-maturing crop, so it can be tough to know exactly when celery is done growing and ready to harvest.
If you’ve been asking yourself how to know when celery is done growing, the answer comes down to watching a few key signals like stalk height, leaf color, and overall firmness.
In this post, we’ll walk through how to tell when celery is done growing, what signs mean it’s ready to pick, and what happens if you leave it in the ground too long.
Let’s dig in.
How to Know When Celery Is Done Growing
Knowing when celery is done growing comes down to a handful of visual and physical clues.
Here’s what to look for:
1. Stalks Reach Full Height
Most celery varieties are done growing when the stalks reach about 12 to 18 inches tall.
At this stage, the stalks are thick, firm, and have a crisp snap when you bend them.
If your celery still looks thin and floppy, it’s not done growing yet.
Give it another week or two and check again.
2. Leaves Turn Dark Green
The leaves at the top of the plant are one of the best ways to know when celery is done growing.
When celery is done growing, the leaves shift from a pale, yellowish green to a rich, dark green.
That deep color means the plant has finished maturing and is packed with flavor.
3. The Center Stops Producing New Growth
Celery grows from the center out.
While the plant is still developing, you’ll see new little stalks and leaves pushing up from the middle.
Once celery is done growing, that central growth slows down and eventually stops.
If the middle looks settled instead of busy, your celery has likely finished its growing cycle.
4. Stalks Feel Firm, Not Spongy
Squeeze a stalk gently.
Celery that’s done growing feels solid and crisp.
If the stalks feel spongy or hollow, the plant may be past its prime or stressed from heat or lack of water.
How Long Does Celery Take to Finish Growing?
Celery typically takes 100 to 130 days to finish growing from transplant.
That’s a long season, which is why many gardeners start celery indoors.
Cool weather speeds up growth, while hot, dry conditions slow things down.
If you’re wondering when celery is done growing in your garden, count the days from transplant and then check the visual signs.
1. Days to Maturity Varies by Variety
Some celery varieties are done growing in as little as 85 days.
Others take closer to 120 days or more.
Always check the seed packet for the specific days to maturity.
2. Cool Temperatures Help Celery Finish Strong
Celery loves cool weather.
Temperatures between 60°F and 70°F are ideal for helping celery finish growing with crisp, sweet stalks.
Once the heat of summer kicks in, growth slows and quality drops.
3. Consistent Water Matters
Celery needs steady moisture to finish growing properly.
If the soil dries out, the stalks become stringy and tough.
Keep the soil evenly moist and your celery will be done growing right on schedule.
Signs Celery Is Overripe and Past Done Growing
Sometimes celery stays in the ground too long.
Here’s how to tell celery is past done growing:
1. Stalks Turn Hollow and Pithy
Overripe celery loses its crispness.
The stalks become hollow in the center and feel light for their size.
2. Leaves Start Yellowing or Bolting
If the leaves turn yellow or the plant sends up a tall flower stalk, it has bolted.
Bolting means the celery is done growing for good and the stalks turn bitter.
3. Flavor Becomes Bitter
Celery that’s past its prime tastes strong and bitter instead of mild and sweet.
If you notice that, it’s time to pull the plant.
So, How Do You Know When Celery Is Done Growing?
You know celery is done growing when the stalks hit full height, the leaves turn dark green, the center stops producing new growth, and the stalks feel firm and crisp.
Waiting too long leads to hollow, bitter stalks, so harvest as soon as those signs show up.
With a little patience and a close eye on your plants, you’ll know exactly when celery is done growing and ready for the kitchen.