From Family Plot.

The best time to cut back a gardenia bush is in the early spring. Jason Reeves from the West TN AgResearch and Education Center says if it is a tropical gardenia you should not trim it back before you bring it in the house for the winter. The pruning will encourage new growth which you don’t want in the house. If it is a hardy gardenia that you will be leaving outside, you can trim it a little now. But, the best time to prune is the spring.

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