Soil heating "spikes" for potted plants
There are mnany sources for heating cables so why not soil heater spikes of some sort? I can buy bucket heaters of many types, heaters to warm water in a coffee cup but heat "spikes" to warm or at least keep from freezing the soil in large potted plants outdoors are not on the market anywhere. I had several potted plants including rhododendrons on my deck and several either died or look like they will due to the 2 degree winter this past year. From what I read most should have survived the cold but they didnÃ¯Â¿Â½t. Perhaps if they had been in the ground instead of pots they would have.
I hope someone has some thoughts on this heat spike idea especially if they know of a source.