Here is an affordable and effective alternative to glass greenhouses.
"Walipini" is an Aymara Indian word that means "place of warmth". Imagine an underground growing pit that allows for year round vegetable gardening, even in cold climates.
You can start the seeds earlier this way and even incorporate animals into the space.
The one shown here is in Cedar City, Utah and cost around $3,000 to build plus labor.
--Bibi Farber
For more information see 4evergreenhouseguy on Youtube