Zinnia planting time depends on the required flowering time. It is generally sown in the greenhouse 2 to 3 months in advance. It is better to broadcast in the open field after the severe cold in early spring, otherwise the seedlings will not develop well. If it is used in autumn flower beds, it should be planted in summer. The suitable soil for Zinnia has fertile, loose, and well-drained sandy culture soil. The suitable temperature for germination is between 20℃and 25℃. Zinnia should not be planted too densely. It is advisable to plant one plant in each pot and seeds in each pot. The number should not be too dense, and the environmental temperature for planting should be suitable, not too high or too low, and the greenhouse should be stable, with sufficient sunlight, and sufficient water and nutrients.