Apium graveolens var. dulce
Start indoors 10 weeks before last frost. Soak seed for 24 hours, scatter seeds on soil mix and lightly cover with 1/8" of soil, as light is needed for germination along with a soil temperature of 21°C (70°F) and constant moisture. Celery will take 7-14 days to germinate. When seedlings are about 1" tall, transplant to individual pots. Transplant after all risk of frost, spacing about 6-9" apart in rows 24-32" apart.
Full sun required. Celery is a heavy feeder and grows best in soil rich in organic matter with a pH of 6.5. Before planting add plenty of compost and rotted manure. Celery has a shallow root system. To conserve moisture and cut back on weeds, mulch around the plants and water during dry spells. Lack of boron may cause stem cracking. Blanching is not necessary but it does improve flavour.
Young stalks on the outside of the plant can be harvested anytime. The entire plant is harvested once a desirable size is reached, remembering celery has a long maturity of 100-120 days. For best flavour and longer storage, water plants the day before harvest.
Pests & Diseases:
Everything expect carrot, parsley, dill and parsnip.