Evergreen Clematis failure to thrive
I put in a young plant from Flower World last spring. It's leaves started turning brown and dropping off one by one almost immediately. I think there may be three left. No, it's not dead--not quite anyway. But I think it's not going to survive the winter.
It could just have been an unhealthy plant to begin with. But I want to give its replacement a better chance. Can anyone suggest soil amendment or other strategies? It's in a new planter of imported topsoil with plenty of organic compost, and I added a little steer manure I had on hand when it first started looking ill, to no effect.