Is it normal for the leaves of gardenia to turn yellow after winter?

Falling leaves in winter is a normal phenomenon because indoor ventilation is poor. Suggest pouring some ferrous sulfate, as iron deficiency can also cause yellowing and leaf loss. It’s best to wait for the weather to warm up, and then move to an outdoor area for farming and there will be no problem.Buy a normal green gardenia without yellow leaves, and be sure to water it less. Let the soil dry before watering. It’s difficult to keep gardenias that have yellow leaves when bought, and those that lack energy are difficult to grow well.