The onion growth period of onion refers to the period when the onion seedlings transform into the top of the reproductive till the convulsions and flowering seeds mature. This period can be divided into the following phases: 1. Seedlings return to green. After planting, the temperature reached 7 degrees Celsius or more, and it began to grow and develop. Three to four young leaves that had not yet grown out of the leaf sheath before winter were differentiated and grew in the spring. The flower organs also differentiated and grew until the flower buds were exposed. Seedlings return to the green period. Second, convulsions: from the last 1 leaves grow into a calyx at the top of the calyx exposed leaf sheath, to calyx growth, calyx burst until the convulsions. This period is generally 10 to 15 days. Third, the flowering period. After the ball breaks, the floret opens from the center to the surroundings, until the flowering ends, and it is the flowering period. Fourth, the maturity of the seed. Spice Novelties Co.,Limited , https://www.wholesale-adult-toys.cn