The growth and development of celery include two stages of vegetative growth and reproductive growth.

1. The vegetative growth stage of celery

1. Germination period: celery seeds germinate until the first true leaf appears, 10~15 days, and the suitable temperature is 15~20℃.

2. Seedling stage: The first true leaf of celery appears until 4~5 true leaves are unfolded. At about 20℃, it takes 40-50 days for celery and 50-70 days for celery, which is a suitable period for planting. Celery has strong adaptability in the seedling stage, and can withstand high temperature of about 30℃ and low temperature of 4℃~5℃.

3. Leaf cluster growth period: 4~5 true leaves of celery are exhibited in the unfolded layer of core leaves. The plant is as high as 30~40 cm. It takes 30~40 days at a suitable temperature of 18℃~24℃, and it takes 5℃~10℃ low temperature 10 It's easy to bolt over days.

4. Heart leaf hypertrophy period: most of the celery heart leaves are displayed until harvest. At this time, the petiole quickly grows hypertrophy, and the growth accounts for 70%~80% of the total plant. It takes 30-60 days at 12℃~22℃. The harvest is in good time.

2. Reproductive growth stage of celery

1. Dormancy period: The celery seed plants will survive the winter (winter storage) under low temperature and are forced to dormancy.

2. Flowering and fruiting period: Overwintering celery undergoes vernalization under the influence of low temperature, and the vegetative seedling ends begin to transform into reproductive seedling ends at 2℃~5℃. Bolting in spring at 15℃~20℃ and long-day sunlight, forming flower buds, blooming and setting seeds.

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