Vegetable · Apiaceae
Celery
Apium graveolens var. dulce
Offer rich soil, cool weather, and water that keeps flowing, and this forgiving crop will thank you with crisp, tender stalks.
Full sun
Every 2–4 days
55–64°F · 13–18°C
85–120 days
Overview
You may have heard celery called the fussiest crop in the vegetable garden, and there is some truth to that, but do not let it scare you off. A relative of carrots and parsley, it simply likes steady cool weather, ground that is full of organic matter, and moisture that keeps coming, because those shallow roots dry quickly. Give it those things and you will be rewarded with clean, crisp stalks.
Here is the quirk worth understanding: celery is a biennial grown as an annual, and that single fact explains most of its mischief. When a young plant meets a long cool spell early in life, it can decide a whole year has gone by and rush to seed instead of building stalks. Once you know this, you will see why getting the transplant timing right makes such a difference, and it is an easy thing to get right.
None of this puts celery out of reach for you. The label that fits is demanding, not impossible. Think of it as a thirsty, slow grower that asks for fertile soil and a little patience, and over a long stretch from late summer into fall it gives plenty back.
Care
The short version: give it full sun with perhaps a touch of afternoon shade, rich soil full of organic matter, and water that never runs short, all kept in the cool 55°F to 64°F (13°C to 18°C) range it loves, and you are well on your way.
Light
Your celery will be happiest in full sun, yet it is forgiving enough to accept a bit of afternoon shade, which is genuinely welcome where summers turn warm. Where it falls short is in heavy shade, which gives you thin, weak stalks, so when you can, hand it the open, bright spot.
Water
If there is one thing not to let slip, this is it, and it is simple to stay on top of. Because celery is shallow-rooted and thirsty, plan on at least 1 to 2 inches of water a week with soil that stays moist. Should it dry out, even for a short while, the stalks can turn stringy, pithy, and bitter, so a steady hand here keeps everything sweet.
Soil
Settle your plants into rich, moisture-holding loam that is full of organic matter and dug nice and deep, which helps those shallow roots stay comfortably damp. Aim for a pH around 5.8 to 6.8, and a little compost mixed in before planting will keep paying you back through the whole season.
Temperature
Cool weather is celery's comfort zone, and it feels best between 55°F and 64°F (13°C to 18°C). When heat builds, the plant gets stressed and leans bitter, and a drawn-out cold snap early in life can send it bolting to seed, so a mild, steady spell is what you are aiming for.
Humidity
There is no humidity number for you to chase here; everyday outdoor air suits celery just fine. What truly matters is good airflow, since foliage that sits crowded and damp gives leaf blight the opening it needs.
Feeding
Think of celery as a hungry feeder even in ground already rich with organic matter. Offer a balanced, nitrogen-rich fertilizer roughly every two weeks across the growing season, and keep a little calcium on hand so the hearts stay sound rather than turning black.
Pruning
Happily, there is very little cutting to do. Take off any diseased or yellowing outer leaves along with side suckers, and simply leave the central growing point alone. For gentler, less bitter stalks, blanch the outer ones for 2 to 3 weeks ahead of harvest by mounding soil around them or wrapping them, while self-blanching kinds ask almost nothing of you.
Repotting
Celery only changes homes once, when it travels from the seed tray out to the garden, and from there it happily stays put. Since it is not usually a container plant, you will not have any potting up to fuss over as the season goes on.
Size & spacing
Expect plants to stand 18 to 35 inches (45 to 90 cm) tall while keeping a fairly slim footprint. Give each one about 12 to 18 inches (30 to 45 cm) of room, snug enough that they help blanch one another yet roomy enough to let air drift through.
When to plant
Celery takes a long, easygoing road to harvest, and that is fine. Sow the seeds indoors in late winter, wait to move the plants outside until the sharpest chill is behind you so bolting stays off the table, and then pick your stalks from late summer into fall ahead of any hard freeze.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 10 to 12 weeks before the last spring frost
- Plant: From about 2 weeks before to around the last spring frost, once soil has warmed and night temperatures stay above 50°F (10°C)
- Harvest: Late summer into fall; harvest stalks before a hard freeze
Hardiness
USDA hardiness zones: 3–10
Temperature: down to -40°C
Troubleshooting
Almost everything that goes sideways with celery shows up in the stalks, and behind nearly all of it sits water or temperature, both of which you can manage. Spot the early hints and you can usually nudge the crop right back where you want it, and most stumbles here are fully recoverable. Find what matches your plant below, then make the small fix before more of it follows.
A tall flower stalk rises up and the stalks go bitter
This is bolting, which shows up when young plants endure a long cool spell that fools this biennial into flowering a whole year ahead of schedule. After a seedstalk climbs, the plant gives up on making good stalks, so harvest whatever is still tender before it toughens and then pull the bolted one. Your best protection is gentle patience: harden off the transplants and move them outdoors only once the threat of lasting chill is truly behind you.
Fix:
- Harvest usable stalks promptly before they toughen
- Remove bolted plants
Dark, dead tissue tucked deep in the plant's center
What you are seeing is blackheart, and the comforting part is that it is not a disease chasing your plant but a calcium shortage in those fast-growing inner stalks, so there is nothing to spray. It tends to appear when watering is uneven and heat is high, because the plant simply cannot shuttle calcium to the heart quickly enough. Hold the soil at a steady moisture level, feed a little calcium by side-dressing, and rescue the good outer stalks while tossing only the rotted hearts.
Fix:
- Keep soil evenly and consistently moist
- Side-dress or foliar-feed with calcium
- Harvest unaffected outer stalks; discard rotted hearts
Spots that spread and a browning blight on the leaves
You are looking at fungal leaf blight, which gets its foothold when the foliage stays wet and the soil cannot drain well. Little spots grow and merge across the leaves and petioles, moving quickest in humid, soggy stretches. The remedy is straightforward: pull away the affected foliage, give the planting more room to breathe, and do your best to keep water off the leaves.
Fix:
- Remove affected foliage
- Improve air circulation and avoid overhead wetting of leaves
Stalks that split, turn fibrous, or feel hollow within
More often than not, stringy, pithy stalks are a sign of thirst, because celery really dislikes bouncing between wet and dry. A boron shortage, or just leaving the plant to stand well past its prime, can bring on the same look. The fix is gentle and easy: bring the moisture back to an even rhythm, keep the soil fertile, and pick on time rather than letting the stalks coarsen in the ground.
Fix:
- Restore and maintain consistent soil moisture
- Harvest at proper maturity rather than letting plants stand
Toxicity
Good news on every front: celery is safe to eat and safe to grow alongside pets and children. The only thing worth keeping in mind is for you, the gardener. Its leafy tops hold a natural compound called furanocoumarin that can leave sensitive skin a little red after you work with them in bright sun, and a quick rinse of your hands clears that up.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Perfectly fine for cats to be near and to nibble on. Should one overdo it on any plant at all, a short bout of tummy upset is possible, yet celery on its own does no harm.
Dogs None
Many dogs love it as a crunchy snack, and it brings no harm. A few may need to pee a bit more afterward, and a generous helping can loosen the stomach, but you have nothing to fret about with either.
Horses Safe
Stalks and leaves alike go down easily for horses with no trouble at all. Just slice everything into manageable pieces so an eager eater has no chance of choking.
Rabbits Safe
In moderation, rabbits are delighted by celery and its leafy tops. Snip the stalks into small pieces so those long strings have nothing to catch on.
Livestock Safe
Feel free to let goats, sheep, and cattle browse on celery and its trimmings, as it sits well with all of them.
Birds Safe
Chickens and their feathered friends will gladly peck away at chopped stalks and leaves, which make a lovely bit of greenery for them.
People Safe
On the plate, celery is a trusty kitchen staple whether raw or cooked, and there is nothing for you to steer clear of in eating it. The only catch lives in the handling: foliage and sap hold furanocoumarins that can leave sensitive skin a little red and itchy after you work with the tops in bright sun, so give your hands a rinse when you are done.
Like other Apiaceae (parsnip, celeriac), celery foliage and sap contain furanocoumarins (psoralens) that can cause mild phytophotodermatitis in sensitive people who handle the tops in bright sunlight; this reaction is milder than with parsnip. Wash skin after handling the foliage and avoid prolonged sun exposure on contacted skin.
Varieties
You will only meet a handful of celery varieties in home gardens, and what really separates them is how much blanching, if any, they ask of you. Here are the few that are worth getting to know.
Tall Utah (Utah 52-70 / Pascal type)
If you want a safe, dependable first pick, this is it. A standard dark-green pascal type with tall, crisp, compact stalks, it is the classic celery that most extension offices point home gardeners toward.
Golden Self-Blanching
This compact early variety does some of the work for you, with stalks that soften to a pale yellow all by themselves, sparing you the trenching and wrapping that other kinds ask for.
Tango
Gardeners reach for this hybrid because of its tender, nearly stringless stalks, and it shrugs off heat and uneven moisture more gracefully than the older types, making it a kind choice while you find your footing.
How to propagate
There is just one way to grow celery, and that is from seed. The slow, finicky beginning is where its demanding name comes from, though it is nothing you cannot handle.
SeedDemanding
Start indoors 10 to 12 weeks before the last spring frost · About 10 to 12 weeks to transplant size, then roughly 85 to 120 days from transplant to harvest
Celery begins life as a seed, and yes, it will ask for your patience right from day one, which is completely normal. Sow indoors 10 to 12 weeks before your last frost, resting the tiny seeds on the surface or barely covering them since they need light to wake up, and keep them cozy at around 70°F (21°C) and never let them dry out. Sprouting comes slowly and a bit unevenly, so soaking the seed beforehand gives it a helpful head start. After transplanting, allow another 85 to 120 days and your stalks will be ready to cut.
Myths
Celery has to be trenched and blanched or the stalks will be inedible.
Take heart, because blanching does no more than ease the bitterness and fade the green color. Green and self-blanching varieties are perfectly good to eat unblanched, which means the whole trenching ritual is yours to choose rather than something you must do.
Standing a cut celery base in water will grow you a whole new bunch of stalks.
The base will indeed sprout, but what you get is modest leafy regrowth that is lovely for flavoring a pot. A real crop of stalks comes from seed-started plants, so the windowsill stump is a fun extra rather than the main event.