Gardenia is too difficult to grow for flower lovers in the north. Once the soil is not suitable, the leaves will turn yellow and the roots will rot and the roots will not bloom. It is better to switch to hydroponics. When cutting gardenia in spring, cut it off. Next, insert a branch of suitable length into the water. If the temperature is suitable, change the water every 2 days. It will take root in about ten days. After taking root, maintain it normally and maintain sufficient light, and it will soon grow flowers.