Straw Bale Greenhouse in progress. This is just one of several greenhouses I am working on with square hay bales, straw, and actually hemp bales.
This one is south facing and the square bales are blocking the strong winds from the North and West. You will see several recycled windows leaning in the back where I am experimenting with some early plantings. Also, note that we have some temporary cattle panels bent into place that I will cover with greenhouse plastic. My main concern is the strong winds we get on our permaculture property, there are very few trees and wide open fields next to us.
Cheap $20 Greenhouse made with old windows.
A friend of mine had some old window panes he was getting rid of for $20.00. I was going to build a frame to put them on the West side of the house but it turned out they fit perfectly in the flowerbed. Capped the ends with some used wood blocks I cut to fit. 3 on one side, then left a gap in the middle with some large rocks as a thermal mass (as well as the radiant heat from the house). Within 3-4 days I started seeing our perennials starting to sprout up.
My modified design for a Custom-built Mini Greenhouse for Apartments, backyards, or in your home. Dimensions: 48" x 24" x 55" The bottom shelf can be removed to convert it into a Cold Frame Great for starting plants, or getting your garden going inside the house or on the balcony. The price including materials and labour to build it was $750 (Alberta, Canada).
Mini Greenhouse I discovered on the web and recently hired a contractor friend of mine to build a similar cabinet.