I have two established gardenia bushes on the south side of my house and they have been doing well for eight years. Tonight the temperature is supposed to drop to 20. Do I need to cover or mulch them?
Certified GKH Gardening Expert
I would definitely cover them up for the night. This article can help you with this: https://www.gardeningknowhow.com/plant-problems/environmental/protect-plants-in-freeze.htm