Actually he is an african tortise and getting near 60 lbs. He will be getting over 200 lbs over the next several years. Eventually I may not need to ever mow my bermuda grass with him around. He doesn't hibernate and when we tried an unheated house he caught a cold and had a snotty nose and was wheezing. I found a mother earth news solar regulating greenhouse design that looks good. It seems that most of the greenhouses use a fortune in energy heating during the winter and then nearly as much in the summer cooling. Its nuts. Any one here ever make a passive solar greenhouse? I've been collecting old windows for a year now. Thanks, Damon PS I may be heating parakeets now also.

Sorry this may ramble a bit, but so much is going through my little head right now, I'm just letting it out as I think of it. This is bringing up lots of memories of when my dad started out with a small lean-to on the side of the house to sell tomato plants 35 years ago. That business grew several times until we had a single 40 X 50 greenhouse that took up the entire back yard. We now have 5 acres and multiple greenhouses at another location that I have run since 1997 and now produce and sell over 100,000 plants per season. So this is coming from a grower/retailer perspective. Check that you can sell items that aren't grown in your greenhouse. I have to grow 75% of what I sell on site in my zoning. Buy a greenhouse with the appropriate snow load/wind rating for your area. It doesn't take much wet snow to collapse a poorly designed greenhouse. I have two from a Canadian company-Harnois (the third is from a company that I think and hope are now out of business-they were awful to deal with). They were easy to put up and have worked great for us. The last one I bought (30 x 48-which probably the minimum you should consider) was about $7,000 nearly 10 years ago. This price included one heater and three roll up motors and two layers of plastic. I had to build my own end walls to save a little money but you can buy an endwall package separately. You will need electricity for the roll up vents (side and peak) and for the ignition for gas heater(s). But that requirement would be less than for exhaust fans for a ghs with no vents. I wouldn't risk my plants in somebody else's greenhouse that couldn't keep them heated if needed. Nor would I trust my hard work to a greenhouse made from PVC. You need one large enough that people can walk around comfortably and accommodate each vendor. Hoop houses generally don't have a lot of head room along the sides unless you get a high tunnel. If you expect the business to grow get a greenhouse that may be a little larger/wider than you think you need. Otherwise you will be replacing the small one real soon-kind of a waste of money. We went from lots of small greenhouses to a couple larger greenhouses to the single large house and now several large greenhouses. Buy something that is intended to be a greenhouse-you don't want to be jerry rigging something that might not work as expected. There are plenty of professional greenhouse manufacturers (Nexus, Atlas, Jaderloon, Conley, Harnois,etc) out there that will help you. They also will have the proper materials to use and be able to provide you with some guidance. You'll be much happier and the product will probably last a lot longer. Check out Greenhouse auction This is a past auction that still has 450,000 square feet of greenhouse left from a bankrupt nursery. They will arrange shipping for a fee. My hoop houses (20 x 48 & 17 x 48) are open at one end where I can pull the plastic up or lower it to get air and cool off the house. The other end has a regular sized door. The larger one is made so I can pull up the sides about 2 feet off the ground using ropes. Even when fully open, they get 100F + by late May or about 20-30ºF warmer than outside. I use these to hold plants-no customers allowed. Trust me, nobody wants to stay in those conditions for very long-customers or vendors. I also would be leery of the pest issue. Even if everyone has 100% pest free plants (extremely unlikely IMHO) you will get pests. Who will be responsible, and what kind of controls will you use? Preventative or curative? An ornamental grower will have different requirements than an a veggie or herb grower. You may have to have separate greenhouses and spray equipment etc. This idea opens you up to additional liability. If somebody else's plants are lost in your facility you'd better have insurance! Of course you should have insurance if the public will be on your property anyway (a hidden cost and a selling point to potential vendors) $25,000 is not a lot of money. You will run into lots of unexpected costs. Will you have to make other improvements to accommodate the public and vendors-like bathroom facilities? How quickly do you expect to get a return on your money? The people who you should listen to as far as the type of structure are the people who would be using it. What are their needs and concerns? Taking the plastic off in the winter raises a few comments/questions. I assume that you would recover in the late winter/early spring. I don't know about your area but in mine that time of the year is the worst time to try to stretch a huge piece of plastic because most days are breezy. It takes only the slightest breeze to fill a greenhouse cover like a giant sail. You have to do the job when there is no breeze otherwise, you will be miserable trying. It is also a job for several people. The larger the greenhouse the harder it is to cover. Although easier to cover a small greenhouse heats up extremely quickly and has other disadvantages as well. $10 a day is a lot to pay for a vendor-farmers markets in our area cost $50 for the whole season (May thru November, one day per week). Maybe you should charge for the whole season instead of by the day. Or do both but give a discount if they pay for the whole season up front. That gives them an additional incentive to show up everyday. You have to convince your vendors that you have something to offer for their money. And it needs to be something they can't do on their own and will make them money. Find out what they expect and need and then offer that to them. What would the advantage be to have their plants in your greenhouse if they have their own already. Is this advantage worth them paying a little extra money to you? Who will take care of promoting the market? Pay for advertising? Hope this helps!

FWIW, I would be very surprised if you could use the milkhouse with the ouside walls covered up to 6' in dirt piled against them. Buildings are constructed to withstand blow-out, not cave-in. Basements are designed for cave-in, not blow-out. Of primary concern would be the buildings footings, but equally the thickness of the walls and whatever ceiling cross-bracing is in place. Consider the snow-load on the roof, as it won't be able to shed off as it did before if you get 2' of snow on the ground at the eaves. Assuming you piled dirt up to the top of the 6' wall, you will end up using nearly twice as much dirt as you would have to remove to create a 16'x16'x6' deep pit. So consider that. Cheers, Russ

My greenhouse sits on a large deck floored with pressure treated 2x4s. I used polystyrene boat carpet to floor the greenhouse. It 's relatively cheap, tough, drains water, not damaged by water or sunlight, and dries fast. It's hard to stain, but it can be done if you're a klotz like me. I just laid it over the decking and tacked it down along the edges with pressure treated 2x2 screwed into the wood greenhouse foundation. Commercial grade aluminum sills hold the carpet in the 4' wide doorway on each end. No underlayment, adhesive or anything like that. The carpet has been there going on six years and shows no signs of deterioration. The picture was taken when the greenhouse was a year or so old: