You can grow celery root by starting it from seed indoors and then transplanting the seedlings into a garden bed with rich, loose soil.
Celery root, also known as celeriac, is a cool-season crop that rewards patient gardeners with a nutty, versatile root that tastes like a cross between celery and parsley.
If you’ve been wondering how do you grow celery root, the good news is that it’s not complicated once you understand its quirks.
It just needs a long growing season, consistent moisture, and soil that drains well.
In this post, we’ll walk through how to grow celery root from seed to harvest, the conditions it loves, and the common mistakes that trip up new growers.
Let’s dig in.
How Do You Grow Celery Root From Seed?
Learning how to grow celery root starts with the seed, because celeriac has a reputation for being slow and finicky to germinate.
Here’s the process broken down.
1. Start Seeds Indoors 10 to 12 Weeks Before Frost
Celery root needs a long head start because it takes roughly 100 to 120 days to mature.
Sow the tiny seeds indoors about 10 to 12 weeks before your last expected frost date.
This gives seedlings time to size up before they ever touch garden soil.
2. Sow Shallow and Keep Moist
Celery root seeds need light to germinate, so press them gently into the surface of a seed-starting mix rather than burying them.
Keep the soil consistently moist, almost like a wrung-out sponge, and mist rather than pour water so you don’t wash the seeds away.
3. Provide Warmth and Patience
Germination can take two to three weeks, which is why so many gardeners give up on learning how to grow celery root.
Keep trays around 70 to 75°F (21 to 24°C) until you see green, then move them to a bright spot.
How Do You Grow Celery Root in the Garden?
Once your seedlings have a few true leaves and the danger of frost has passed, it’s time to move them outside.
Here’s how to grow celery root successfully in the ground.
1. Harden Off Before Transplanting
Set your seedlings outside for a few hours each day over a week to toughen them up.
This step matters because celery root hates shock, and a sudden move can stunt the plants for weeks.
2. Choose Rich, Loose Soil
Celery root grows best in fertile, well-draining soil with plenty of organic matter worked in.
A raised bed filled with compost is one of the easiest ways to grow celery root because it keeps the soil loose enough for that bulbous root to expand.
3. Space Plants 8 to 12 Inches Apart
Give each plant room to breathe and spread its roots.
Crowded celery root plants compete for water and nutrients, and the roots end up small and fibrous instead of plump.
4. Water Consistently
This is the single most important rule for how to grow celery root well.
Celeriac wants steady moisture, roughly an inch of water per week, and it sulks if the soil dries out completely.
Mulching around the plants helps lock in that moisture and keeps the soil cool.
How Do You Grow Celery Root With Proper Care?
Once established, celery root is mostly a matter of maintenance, and a few habits make a big difference.
1. Feed With a Balanced Fertilizer
Celery root is a heavy feeder, so side-dress with compost or a balanced organic fertilizer a few weeks after transplanting.
Feeding every three to four weeks keeps those roots bulking up instead of stalling out.
2. Prune Outer Leaves
Around mid-season, snip off the lower outer stalks so the plant directs energy into the root.
This trick is a favorite among gardeners who know how to grow celery root for big, smooth bulbs.
3. Remove Side Shoots
Celeriac tends to push out small side roots, and rubbing those off by hand keeps the main root clean and uniform.
4. Watch for Pests and Disease
Aphids, slugs, and leaf blight are the usual suspects.
Keep the bed weeded, avoid overhead watering late in the day, and your celery root will stay healthy.
How Do You Grow Celery Root to Harvest?
Knowing when to pull your celery root is the final piece of the puzzle.
1. Wait for a 3 to 4 Inch Root
Your celery root is ready when the bulb reaches about three to four inches across and feels firm.
You’ll often see the top of the root peeking above the soil line, which is a helpful visual cue.
2. Harvest After Light Frost for Best Flavor
A touch of cool weather sweetens the flavor, so many growers wait until after the first light frost.
Just don’t let the ground freeze hard before you dig them up.
3. Lift Carefully With a Fork
Loosen the soil around the root with a garden fork, then pull it up by the base of the stems.
So, How Do You Grow Celery Root?
You grow celery root by starting seeds indoors early, transplanting into rich, loose soil, and keeping the bed evenly moist all season long.
It’s a slow crop, but the reward is a firm, flavorful root that stores well and shines in soups, roasts, and mash.
Hope this post has helped you understand how to grow celery root from seed to harvest and the care that keeps it thriving.