Using A Heating Cable For Potted Plants During Winter
I want to plant a tall lilac bush and a tall service berry bush (looking for 10' tall or so). But, the area that it's going in is on top of my stone patio. So, I want to keep them in a large insulated container or build a raised bed with insulation. I live in MA though and fear they might die during the winter due to the roots freezing. I'm wondering if I put a soil heating cable into the soil of the insulated pot/raised bed if that would suffice to ensure they survive the winters? Maybe also a soil heating mat and some extra mulch on top for good measure?
What do you think?