Oil cabbage can be cultured in water, and the maintenance method is simple. As long as it is fixed and changed frequently, it should be changed every 5~7 days to keep the water clean. Its purpose is to observe the late growth of small rapeseed, that is, the process from bolting to flowering, and then to the final fruit.

Because it is a short-term hydroponics, the whole process only takes 1~2 months, so there is no need to use nutrient solution; If nutrient solution is needed, it is recommended to use it after water roots appear, and adding nutrient solution properly is helpful for its later growth.

In terms of time, February-April every year is the most suitable for hydroponics, and the suitable temperature range is between 12~25 degrees, which requires sufficient illumination.