Tomatoes need sufficient light both at seedling stage and during the whole growth period, and do not need shading. In case of continuous rain, the growth is weak, the stems are thin, the leaves are small and thin, and the leaves are light green.
Tomatoes require the same humidity as ordinary tomatoes, but they are not as drought-tolerant as melons. The humidity should not be too high at seedling stage and growth stage to prevent diseases. Under the condition of soilless culture of family balcony, it is influenced by people's living environment and changes with the weather. The relative humidity of balcony can reach above 90% in rainy days, and it can be reduced to 50% ~ 60% in sunny and windy days. Family balcony cultivation can spread an old carpet on the ground to spray moisture, but pay attention to ventilation to prevent disease.