Celery Companion Plants
Vegetable120 days to maturity
Celery is a demanding, long-season cool-weather crop grown for its crisp leaf stalks, requiring constant moisture and rich soil to keep from turning stringy and bitter. It has slow, finicky germination and needs 85 to 120 days to mature, making it one of the more challenging garden vegetables. Blackheart from calcium deficiency and blight diseases are its common downfalls.
Companion Checker: what grows well with Celery?
Tap any plant to see whether it pairs well with Celery and why. Green means a beneficial companion, red means keep them apart.
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Companion Planting Strategy for Celery
Celery thrives among aromatic alliums and a few well-chosen vegetables that share its love of rich, moist soil while helping repel the pests it attracts. Avoid planting it with its own carrot-family relatives, which share the same pests and diseases.
Best Companion Plants for Celery
These plants grow well alongside Celery — providing pest control, attracting pollinators, or making better use of your garden space.
Leeks and celery enjoy the same rich, moist soil, and the leek's onion scent helps drive off aphids and the carrot fly that bother celery.
Tomatoes provide light shade for cool-loving celery, while celery's strong aroma is said to deter pests, making the two mutually beneficial neighbors.
Celery's strong scent deters cabbage white butterflies from cauliflower, and the brassica returns the favor as a compatible cool-season neighbor in rich, moist soil.
What Not to Plant With Celery
Keep these away from Celery. They compete for resources, attract shared pests, or inhibit each other's growth.
Parsnip and celery are both carrot-family plants that share pests and diseases such as the carrot rust fly and leaf blights, so planting them together compounds the risk.
How to Grow Celery
- Botanical name
- Apium graveolens
- Family
- Carrot/Parsley (Apiaceae)
- Sun
- Full sun to partial shade, 6+ hours daily
- Water
- Heavy and constant - 1-2 inches per week; never let it dry out
- Soil
- Rich, moisture-retentive, well-draining soil high in organic matter, pH 6.0-7.0
- Spacing
- 6-10 inches apart; rows 24-36 inches
- Planting depth
- 1/8-1/4 inch deep; seed needs light to germinate, so barely cover
- Germination
- 14-21 days at 70-75F; soak seed to speed slow germination
- Days to maturity
- 85-120 days from transplant
- When to plant
- Start seed indoors 10-12 weeks before the last frost; transplant after frost danger passes and nights stay above 50F
- Harvest
- Cut outer stalks as needed or harvest the whole bunch at the base before it bolts
Common Celery Problems
Blackheart (calcium deficiency)
Inner stalks turn black and rot from uneven calcium uptake. Keep soil consistently moist, avoid letting plants dry out, and do not overfeed with nitrogen.
Early and late blight and leaf spot
Fungal diseases that spot and brown the foliage. Use disease-free seed, rotate crops, space plants for airflow, and avoid overhead watering.
Stringy, bitter, or hollow stalks
Caused by water stress, heat, or slow growth. Provide constant moisture and rich soil, keep conditions cool, and harvest before plants over-mature.
Aphids and slugs
Aphids cluster on the foliage and slugs hide in the dense stalks. Hose off aphids and use insecticidal soap, and set slug traps or iron-phosphate bait.
Celery Companion Planting FAQ
What are the best companion plants for celery?
Leeks, tomatoes, and cauliflower are strong celery companions. Leeks share its rich, moist soil and repel aphids, tomatoes offer light shade, and celery's scent in turn helps protect cauliflower from cabbage butterflies. Bush beans and other cabbage-family crops also pair well.
What should you not plant with celery?
Avoid planting celery with parsnips and other carrot-family crops like carrots, dill, and fennel. They share pests such as the carrot rust fly and similar leaf blights, so grouping them concentrates problems.
Why is my celery stringy and bitter?
Stringy, bitter, or hollow stalks come from water stress, heat, or slow growth. Celery needs constantly moist, rich soil and cool conditions, so keep it well watered, mulch to retain moisture, and harvest before it over-matures.
When should you plant celery?
Start celery indoors 10 to 12 weeks before the last frost because of its slow germination, and transplant outdoors only after frost danger passes and nights stay above 50F. It needs a long, cool 85-to-120-day season, so time plantings to avoid both spring cold snaps and summer heat.
More vegetable companions
Plan Your Celery Garden
Use our interactive tools to design the perfect garden with Celery and its companions.