I have 3 bushes, just planted this past spring with a possible frost coming over night. I covered the bushes with plastic bags, but only the top leaves. Will this help and is it ok to leave the trunk uncovered?
Gardenias and Frost
Certified GKH Gardening Expert
First, I would not recommend covering a plant with plastic for frost. Condensation builds up under the plastic and that can harm the plant in the cold. In the future, cover it with a sheet or blanket. The plastic can be placed on top of that.
Other than this, it will help to keep away damage from light frosts to do this.