Posted: 03/10/2013 at 16:31
I use bubble wrap to insulate my greenhouse, some rolls come with fasteners especially for aluminun greenhouses. It does incourage a stagnant atmosphere so you need to ventilate as much as possible in mild weather. It does drastically cut down on heating costs. I use a thermastic controlled electric heater, expensive you might think, but I only use it for frost protection. say 2- 4 degrees.I keep pelargoniums, citrus, cacti, cannas and a pheonix palm in this environment. I have used fleese to protect individual tender plants, such as cordylines and musa basjo alive. I now use the woody clippings from my herbacious perrenials wrapped round the base of tender plants, tied with string. It costs nothing and is far more effective. The fig tree I leave unprotected, it has suffered in the recent colder winters but always recovers and I have had figs for the past 5 years.