How Do You Plant Celery Root?
You plant celery root by starting the seeds indoors about 10 to 12 weeks before your last expected frost date.
Celery root, also known as celeriac, needs a long growing season, so getting a head start indoors is key.
If you’ve been wondering how do you plant celery root from seed, the process is simpler than it sounds.
You just need patience, moisture, and a little know-how.
In this post, we’ll walk through exactly how you plant celery root step by step, from seed to harvest.
Let’s dig in.
How Do You Plant Celery Root Seeds Indoors?
You plant celery root seeds indoors first because the plant needs a long season to develop its bulbous root.
Here’s how to get those tiny seeds off to a strong start.
1. Start With Fresh Seeds
Celery root seeds don’t stay viable for long, so you plant celery root using seeds that are no more than a year old.
Fresh seeds germinate more reliably, and you’ll waste less time waiting on seeds that never sprout.
2. Use a Seed-Starting Mix
When you plant celery root seeds, use a light, sterile seed-starting mix rather than garden soil.
This mix holds moisture well and keeps the seedlings from damping off.
Fill small trays or pots with the mix and moisten it before sowing.
3. Sow the Seeds on the Surface
Celery root seeds are tiny, so you plant celery root seeds by pressing them gently into the surface of the soil.
Don’t bury them deeply, because they need light to germinate.
Just sprinkle them on top and press them in lightly with your fingers.
4. Keep the Soil Consistently Moist
After you plant celery root seeds, keep the soil moist but not soggy.
A spray bottle works great for this because it won’t wash the seeds away.
You can also cover the trays with a humidity dome to lock in moisture until germination.
5. Provide Bottom Heat and Light
Celery root seeds germinate best at around 70 to 75°F, so a heat mat helps a lot when you plant celery root indoors.
Once the seedlings emerge, remove the heat mat and place them under bright grow lights.
Give them 14 to 16 hours of light daily to keep them from getting leggy.
6. Harden Off Before Transplanting
Before you plant celery root seedlings in the garden, harden them off over 7 to 10 days.
Set them outside for a few hours each day, gradually increasing their time outdoors.
This toughens them up so the transition doesn’t shock them.
How Do You Plant Celery Root in the Garden?
You plant celery root in the garden once the soil has warmed and all danger of frost has passed.
Here’s how to do it right.
1. Pick the Right Spot
When you plant celery root, choose a spot with full sun to partial shade and rich, well-draining soil.
Celeriac loves organic matter, so work in plenty of compost before planting.
2. Space the Seedlings Properly
You plant celery root seedlings about 8 to 10 inches apart in rows spaced 18 to 24 inches apart.
Good airflow between plants helps prevent disease and gives the roots room to swell.
3. Plant at the Right Depth
When you plant celery root, set the seedlings so the crown sits right at soil level.
Burying the crown too deep can cause rot, so keep it just barely covered.
4. Water Regularly
After you plant celery root, water deeply and keep the soil consistently moist throughout the season.
Celeriac is a thirsty crop, and uneven watering leads to tough, hollow roots.
A layer of mulch helps hold moisture and keeps weeds down.
5. Feed and Mulch
Once you plant celery root and it starts growing, side-dress with compost or a balanced fertilizer every few weeks.
Mulching around the plants keeps the soil cool and moist, which celeriac loves.
Tips for Growing Celery Root Successfully
Learning how do you plant celery root is only half the battle.
Here are a few tips to help your crop thrive.
1. Remove Side Shoots
As the root swells, you plant celery root with the goal of one big, smooth bulb, so snip off side shoots that develop.
This directs energy into the main root instead of smaller offshoots.
2. Be Patient at Harvest
You plant celery root in spring, but it won’t be ready until fall.
Most celeriac takes 100 to 120 days to mature, so wait until the roots reach 3 to 4 inches across.
3. Watch for Pests and Disease
When you plant celery root, keep an eye out for aphids, slugs, and leaf spot.
Good spacing and consistent watering go a long way toward keeping problems away.
So, How Do You Plant Celery Root?
You plant celery root by starting seeds indoors 10 to 12 weeks before the last frost, keeping them moist and warm, then transplanting them into rich, well-draining soil after hardening them off.
From there, it’s all about steady watering, mulch, and patience until fall.
Now that you know how do you plant celery root, you can grow this underrated root vegetable with confidence.
Happy planting.