When and how to harvest celery – to pick stems at the peak of their flavor

A harvest of crunchy and nutritious celery stalks can be a hugely satisfying experience, as it means you have successfully cultivated the tricky crop through its full growing season. Celery does have a reputation for being tough to grow as this cool-season crop has a long season and requires lots of moisture.

When growing celery, you want to harvest the crop when the stalks are the right size and texture. Too soon and they won’t be fully developed, yet wait too long and the celery gets tough and bitter.

It may sound confusing, but we want to help. So let's look at the signs to know when to harvest celery and the different harvesting methods to choose from.

Our guide to a great celery harvest

Start celery by sowing seeds indoors in mid-spring and transplant the seedlings into the vegetable garden at around 4-6 inches tall once the risk of frost has passed. Space the plants around 8-12 inches apart and grow the crop in a sunny spot in moisture-retentive soil.

When to harvest celery

Celery is a crop with a long growing season, so it is preferable to start the crop indoors early in spring or buy transplants to plant the vegetable straight into the garden. It can take 100 to 140 days to mature, depending on the variety and the weather during the growing season.

The season to harvest self-blanching celery is mid-summer through fall, with the crop harvested before the frosts. Traditional trenching varieties of celery are ready to harvest from early fall onwards, into winter if the vegetables are protected from frosts. Check the seed packet for the estimated days to maturity for your variety.

The crop does need regular watering throughout the season, especially during hot weather, as consistent moisture is essential for a good crop of stems to pick. Watering helps the stems swell in size and a lack of moisture will mean disappointingly stringy celery stems.

So, what does celery look like when ready to harvest? The stems will ideally be three inches or more in diameter and at least 6-8 inches in length.

Picking the right time to harvest celery is important. It is preferable to harvest celery as soon as it is ready, when it is most tender, as the longer it grows the tougher it will get. In addition, Rebecca Sears, a gardening expert at Ferry-Morse, recommends: ‘Avoid harvesting celery during a hot, dry spell as it will be tough and stringy.’ Pick a cool time to harvest celery, before the temperature rises above 70F.

Trenching varieties of celery require blanching before harvesting. This can be done by earthing up plants or using covers from mid-summer onwards. Blanching keeps the stalks sweet and tender by protecting them from the sun’s rays. These types can be harvested from early fall onwards once stems reach at least three inches or more in diameter.

Rebecca Sears

As CMO and resident green thumb for the Green Garden family of brands, Rebecca Sears nurtures the company's heritage but also looks to develop new products and solutions to help gardeners of all skill levels fuel their passion and become more successful in the garden. Rebecca has been gardening from coast to coast, first realizing her passion while living in Portland, Oregon, inspired by the public gardens throughout the city.

How to harvest celery

There are two ways to harvest celery, to pick individual stalks to use and allow the rest to grow or harvest the entire head of the plant at once. It is advisable to use clean garden tools, such as a harvesting knife, and wear gloves and long sleeves - such as gardening sleeves, available at Amazon - as celery can irritate the skin.

Ashleigh Smith, the managing editor at True Leaf Market, says: ‘Individual stalks may be harvested as needed from the outer edge, leaving the inner stalks to continue developing.’ The longest stalks around the edge of the plant are the most mature and these can be cut or snapped off to be used. The younger, inner stalks will continue to grow for future harvests.

‘To harvest the whole plant, push the soil away from the crown. Then, cut through the crown just below the soil level but above the roots,’ adds Ashleigh. The crown can either be cut with a knife below the soil line, or the entire plant can be lifted and the head cut from the roots after being removed from the ground.

It is best to use the celery as soon as possible after lifting when it is fresh and crunchy. Older stalks can still be used, as Rebecca Sears recommends using the tougher celery stalks ‘as seasoning in stocks and soups'.

Ashleigh Smith

Ashleigh Smith is the Managing Editor at True Leaf Market with a bachelor's degree in horticulture from Brigham Young University - Idaho. True Leaf Market is a nationally certified organic, non-GMO seed and horticultural company based in Salt Lake City, Utah.

FAQs

How long can you leave celery in the ground?

Celery can tolerate a light frost, but ideally wants to be harvested before the frosts start in your climate. The crop can overwinter in milder US hardiness zones. However, as celery is a biennial plant it will flower and go to seed if left to start growing again in spring. Leaving a few plants to go to seed can give you a crop of celery seeds. These can be used in some recipes, or you can collect seeds to sow for plants next year.

Can you eat celery leaves?

Celery leaves are edible and they can be eaten raw or cooked. The leaves of the plant have the same celery flavor and are highly nutritious. They can be added raw to salads or sandwiches or used in stocks, soups, or sauces.

Will celery regrow after harvest?

It is possible to grow celery from a stalk after harvesting. Sit a 2-inch thick root base of celery in a shallow dish filled with water and place it on a light windowsill. The base will quickly sprout small leaves and shoots and then can be planted in soil around a week later to grow.

Celeriac has a similar taste to celery and is also known as celery root. Rather than being grown for the stalks like celery, however, it is grown for knobbly swollen roots. It is another crop with a long season and you can see more about this great crop in our dedicated guide to growing celeriac.