So if you have a seed source for a particular plant you want to use on your green roof - or elsewhere in your permaculture gardens - a seed starting greenhouse or hothouse may be helpful.
|Greenhouse for Green Roof Plants - Cheapo but Works!|
The photos here and sketch are of a very nice greenhouse we recently built out of scraps. Our total out-of-pocket cost was about US $20!
The greenhouse is 12' wide by 18' long by 8' tall - 3.7M wide x 4.5M long x 2.4M tall (approximate dimensions).
|Green Roof Plant Seedlings|
All the seedlings were cold but fine - not frozen.
The greenhouse's performance pointed to two important facts - 1. you can build a great little greenhouse out of scrap and, 2. by adding jugs of water to the inside of the greenhouse you can keep the hothouse warm enough to protect plants.
|Water Jugs Store Heat - Keeps Greenhouse Warm|
To build the hothouse, first find 6 lengths of scrap pipe. We used metal fence posts we had found in a scrap pile where someone was remodeling a house. Take a big hammer - we used a sledge hammer and drive the pipe into the ground spacing them about eight or nine feet apart (2.5M). Make 2 parallel rows of these installed pipes - see the sketch.
|DIY Hothouse by Kevin|
Attach one side with a ZipTie (WireTie) of the conduit to a pipe in the ground and then easily bend the other side over to the opposing pipe. Proceed to attach, bend and attach all the conduit to the pipes to make the hoops.
We then covered the hoops with a piece of left over greenhouse plastic and attached the plastic to the hoops and pipes with Big Office Paper Clips - they work great.
Presto - the greenhouse was built! Green Roof Seedlings are now growing!
Good luck with yours and as always - Happy Green Roofing....Kevin