I've given considerable thought to that particular book (Winter Flowers.....) since you mentioned it Jim, almost a year ago. I do want a greenhouse, however for me and for the yard set up I now have, it's just not practical. I'm very limited in where I could place a greenhouse and attempting to heat it in my zone 3, well I was looking into solar powered heating systems. Affording that is another huge factor. Twenty feet behind our house is a 3' retaining wall, which is the start of our hill. Not sure on the degree of slope but it's end height is considerably above the top of our house. I can point out a dozen excellent spots for a pit house. Our hill has nothing going through it, no utilities of any sort and consists of heavy clay. Over the summer we watched our neighbor carve a massive curving set of stairs out of their hill and seeing this has got me thinking that a pit house (or 2) may be the route for me. I'm also fortunate in that my husband works in the cement industry and I'll be able to make a sturdy long lasting pit house. I purchased this morning a first edition copy of that book, that includes fold out plans for the construction of the pit. The hard part will be waiting for spring to start digging, our ground is already partially frozen here already. Linda Foulis Okotoks, AB Canada Zone 3