I put my extra tropicals on top of the 2ltr bottles and the soil temperature usually stays about 5 degrees warmer than everyone else with normal winter weather.
My 2nd greenhouse just has plastic around the frame and a cover over that .. I've been busy battening down the perimeter around it to keep the wind from blowing through the bottom on the ends. Luckily it's snugged up to a privacy fence so I don't have to worry about it blowing away .. at least I hope it doesn't blow away! EEEK, gives me the shivers just thinking about it.
MJ - got some Ceropegia stapeliformis seeds coming from South Africa! Let me know if you've had any experience starting Ceropegia from seed.
