Start seeds inside 3/15-4/31, seed depth: 1/8", and keep soil temp 65-75°. Keep seeds moist until germination. Days to seed germination: 14-30. Transplant outside 5/15-6/30 spaced 24" apart. Keep celery plants well watered & weeded. If you like "blanched" celery (light in color like you get it from the store) you can hill soil up around the base of the plant or place something around the plant to block light such as paper collars.
Cut individual stalks or entire plant when they are edible size but before becoming too old and tough. Harvest leaves for flavoring and soup stock.
To grow celery seed the plant must grow outside for 12-14 months with non-freezig temperatures so it can only be grown for seed in moderate climates. If young plants are exposed to temps below 55° they may start to bolt (flower) but these plants will not make many or good seeds
