Giant Prague Celeriac

Celery thrives in rich, well-draining soil with high organic matter and a pH of 6–7. It requires full sun (at least 6 hours daily) but benefits from cooler temperatures. Consistent moisture is essential, as celery has shallow roots and is prone to drought stress.

Sow celery indoors 10-12 weeks before the last frost. Celery seed requires light for germination, so surface sowing is recommended. Cover only lightly with fine starting mix to keep seeds moist. Germination is slow (15-20 days) and often erratic. Covering the trays with clear plastic domes will aid with humidity and promote more consistent germination. If using a heat mat, keep the temperature cool, between 65 and 75 degrees.

Transplant outdoors once seedlings are large enough to handle or once the danger of frost has passed. Space plants 12-18" in all directions. Do not overcrowd as this will increase drought stress.

Insect Pests

Celery can be attacked by a number of insects including aphids, leaf miners and cutworms. Consult your local university extension office for a list of applicable pests and solutions for preventing and treating infestations.

Diseases & Other Problems

Although there are a few diseases that can affect celery, the largest and most common challenge to growing celery is maintaining consistent soil moisture. The plants have relatively large stems and leaves and a small, compact root system. Adequately spacing plants and watering regularly will ensure that the plants stay healthy and tender.

Celery can be stored in the fridge for several weeks. Celeriac can be stored in the fridge or alternatively may be root cellared in sand or sawdust for up to 6 months. Trim tops prior to storage to keep the bulbs crisp.

CONSIDERATIONS:

Celery is a biennial, producing its seed in the second year of growth. Pollination is insect-facilitated with both self and outcrossing possible. It is important, therefore, to grow one variety at a time or sufficiently isolate different varieties, either by distance or by using pollination cages.

HARVESTING SEED:

After flowering, allow the seed stalk to mature. The seedheads will take on a brown cast at maturity, and the plants will turn a yellow color. Pull or cut the plants at the base and place on a tarp or bed sheet. The seeds are prone to shattering (breaking from the head) so be sure to place something beneath them to capture the seed that has fallen. Once completely dry, rub the seed heads or shake into a paper yard waste bag. Place in an airtight container and store in a cool, dark place.

SEED LONGETIVITY:

Celery seeds will maintain 50% viability for up to 8 years when stored under ideal conditions.