Celery has a name for being difficult, and it is really just demanding in one particular way: it wants a long, steady, well watered run in cool weather. Give it that and it is no harder than a leek. The short version is to start seed on the surface because it needs light to germinate, keep the water up all season, and time the crop so it matures in the cool rather than heading into a hot spell.
Why celery gets a reputation
Celery (Apium graveolens var. dulce) takes roughly four to five months from sowing to a full head, and it spends that whole time wanting moisture and fertility. It is a marsh plant by origin, so it never really forgives a dry week. Most of the celery disappointments people describe, the stringy stalks, the bitter edge, the plants that run to seed, trace back to a check in growth rather than to anything exotic.
The other half of the reputation is the seed, which is tiny and slow. That part is easily managed once you know what it wants.
Sowing the seed
Celery seed needs light to germinate, so press it onto the surface of damp seed raising mix and leave it uncovered, or barely dust it. Keep it between about 15 and 21 degrees and expect two to three weeks, sometimes longer. A sheet of glass or a propagator lid over the tray keeps the surface from drying out, which is the usual reason a sowing fails.
Prick the seedlings out when they have their first true leaves and grow them on until they are around 8 to 10 centimetres before planting out, spaced about 25 centimetres apart. Plant into soil you have enriched with compost or aged manure.
One timing trap is worth knowing. Young celery plants that sit through a prolonged cold spell after planting out, particularly below about 10 degrees for a couple of weeks, can read that as a winter passed and run to seed instead of making a head. That is why very early plantings in cold districts often bolt.
When to sow, by climate
- Cool and temperate (Tasmania, Victoria, southern New South Wales, the ACT and the highlands): sow from late winter through to midsummer for an autumn harvest. Avoid planting out into a cold snap.
- Mediterranean (Adelaide and southern South Australia, Perth and the south west of Western Australia): sow late summer into autumn so the crop fills out through the mild months and misses the summer heat.
- Subtropical (Brisbane and northern New South Wales): autumn is the main window, giving a winter and early spring harvest.
- Tropical (far north Queensland and the Top End): grow it in the dry season only, and expect it to be a short and fussy crop.
- Arid and semi arid (inland New South Wales and South Australia, and around Alice Springs): autumn sowing, with shade through the hottest part of the day and more water than you think.
Blanching, and whether you need to bother
Blanching means excluding light from the stalks so they stay pale and mild. Traditional trenching varieties are grown in a shallow trench and have soil drawn up around them, or are wrapped with cardboard or newspaper, over the last few weeks before harvest. Done properly this gives the pale, tender, strongly flavoured celery that trenching types are grown for, and it is more work.
Self blanching varieties are the easier option. They are naturally paler and are planted in a close block so the plants shade each other rather than being earthed up. They suit most home gardens. The trade off is that they are generally milder in flavour than a well trenched crop and less tolerant of cold, so they are best harvested before hard frosts arrive.
There is a third option that deserves more attention than it gets. Cutting or leaf celery is grown for its leaves and thin stems rather than a head, it is much less demanding about water and blanching, and it does the same job in a soup or a stock.
Keeping it growing
Water is the whole game. Celery wants soil that stays evenly moist, not soil that sits wet. Waterlogged ground rots the crown, while a dry fortnight gives you tough, stringy stalks that will not soften again. Mulch helps more here than with almost any other vegetable.
Feed it. A side dressing of compost or a regular liquid feed through the season keeps the growth steady, which is what keeps the stalks tender.
Watch for blackheart, where the young centre leaves die back and blacken. It is a calcium problem, but usually not because the soil lacks calcium. It is caused by irregular watering interrupting the plant's ability to move calcium to the growing tip, so the fix is consistent moisture rather than a calcium product.
Harvesting
You do not have to take the whole plant. Pick outer stalks from the outside in as you need them and the plant keeps producing, which suits a home garden far better than pulling a whole head at once. If you do want the full head, cut it at ground level once it has filled out and before it starts to run up.
In the kitchen
Celery earns its place as a background flavour more than a star. It is one third of the soffritto that starts a great many soups and braises, it holds its texture in a slow cooked dish, and the leaves are worth keeping for stock rather than composting. In Asian cooking, the thinner and more strongly flavoured Chinese celery is used much more assertively, chopped through stir fries and noodle dishes.
Nutritionally it is mostly water, with useful amounts of dietary fibre, vitamin K, folate and potassium. It is a good everyday vegetable rather than a remedy, and claims that celery or celery juice detoxifies or cleanses any organ are not supported by evidence.
Frequently asked questions
Why is my celery stringy?
Almost always water. Any check in growth, most often a dry spell, thickens the fibres in the stalks, and they do not become tender again afterwards. Steady moisture and steady feeding are the fix.
Why did my celery flower instead of forming a head?
Young plants exposed to a long cold spell after planting out can be triggered into flowering. Plant out once the worst of the cold has passed, and choose a sowing window that suits your zone.
Do I have to blanch celery?
No. Self blanching varieties are bred so you do not need to, and unblanched green celery is perfectly good eating, just stronger in flavour and a little darker.
Can I grow celery in a pot?
Yes, in a pot at least 25 to 30 centimetres deep and wide, with a good potting mix. Pots dry out faster than beds, so watering matters even more.
How long does celery take to grow?
Roughly four to five months from sowing to a full head. Picking outer stalks brings the first harvest forward.
Related growing guides
- What to grow in winter: cool-season vegetables across Australia
- Stop being kind to your carrots: why thinning is the step everyone skips
- How to water vegetables deeply, and why a daily sprinkle fails
Ready to plant? Browse our Celery seeds.