Each stage includes a different growth period. The vegetative growth stage includes five growth stages: germination stage, seedling stage, slow growth stage, vigorous growth stage and dormancy stage. The reproductive growth stage is dormant, including flower bud differentiation stage, bolting stage and flowering and fruiting stage.
1, the growth period of celery takes four months. The suitable temperature for celery seeds from germination to emergence is 1 true leaf requirement 10 ~ 15 days, 15~20℃. Celery 1 true leaves have 4~5 true leaves, and the suitable temperature is about 20℃. It takes 40~50 days for this celery and 50~70 days for celery, which is the suitable planting period. In addition, celery has strong adaptability at seedling stage, and can tolerate high temperature of about 30℃ and low temperature of 4℃~5℃.
2. Celery has 4~5 true leaves, and the plant is as high as 30~40 cm. The suitable temperature 18℃~24℃ takes 30~40 days, and the low temperature of 5℃~ 10℃ 10 days is easy to pull out the moss.
3. Most of the heart leaves of celery spread to harvest, and the petiole grew rapidly at this time, accounting for 70~80% of the whole plant. The suitable temperature is 12℃~22℃, and it takes 30 ~ 60 days, which is the suitable harvesting period.