Anyone build a pit greenhouse?
I am planning on building a pit greenhouse, and am curious if anyone else here has done so, and if they would be able to show off pics of theirs. I plan to make mine about 5 foot deep and with a foot print of 12x26. I plan on putting 12 55 gal barrels embedded in the back wall and another 10 55 gal drums will make up the base of a table where my wife will grow herbs and such. These will work for the thermal mass to keep it warm during the colder nights. I not quitew sure if this will be enough, but I figure if it is 5 foot deep then the temp spikes will be mitigated a good bit.
any ideas or info links, or pictures would be greatly appreciated.