Frost Proof Gardenias black leaves - when/how prune?
Here in zone 7 (Puyallup, a Seattle/Tacoma Washington suburb) I have five Frost Proof Gardenias planted around various locations on my 1 acre property. As winter has progressed the gardenias have gotten worse and worse. Most of them have all of their leaves black, a couple of them have a tiny amount of green leaves with the rest black. None of the plants have dropped the leaves. The plants are 12-18" tall.
Anyone know when I should prune these back and how much to prune them back to give them some vigor to find out if they leaf out to see if any of them didn't die?
I've tried other varieties of Gardenias that advertise them as "hardy" and all have been failures so this is my last bunch...