I would like to introduce you to this product that just recently became available.
"My Lazy Gardener" is a unique product that warms plant root zones, aerates the soil and waters the plant all at the same time!
You haven't seen anything like this!
"My Lazy Gardener" is an ideal product for early and late season container gardening, seed starting and for tropical plant, especially tropical fruits like citrus, guava, and papaya.
The beauty of My Lazy Gardener is that it uses much less energy compared to soil heat cables and is a fraction of the length so it's easier to install.
If you have a small greenhouse and have a few sensitive plants that you want to keep warm with out turning up the heat, this is a solution for you.
Take a look at how My Lazy Gardener works in this video: