Greenhouses forum: New propagation greenhouse

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Name: Paul Anguiano
Richland, WA (Zone 7a)
GW & DG: tropicalaria
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psa
Oct 23, 2014 8:23 PM CST
I'm pulling together plans for a quick propagation greenhouse that I can throw up for the winter/spring propagation cycle. We have highly variable temperatures and predictably devastating spring winds, but rarely more than a few inches of snow, so those are the requirements for the structure to handle.

The leading candidate at the moment is a 12'x60' scratch-built galvanized steel hoop house, because it's quick, sturdy, and (relatively) inexpensive. This would provide 720 square feet of grow space, which comes in just under my target minimum of 1000 sq ft, but a wider house would require heavier duty steel, and a longer house would be harder to heat (1 to 5 seems to be the point of diminishing returns for heating. Any longer than that and you might as well build a second house). I would be using double layer inflated poly, knee walls for optional conversion to roll up sides in the summer, diagonal bracing at the corners, and quick, inexpensive endwalls. Also, the most efficient heating that I can cheaply, easily, and safely install.

The location is still undecided, so I have a bit longer to play around with different options, but I'll post plans and pictures as the project comes together.

There's always the chance that I'll find a second-hand frame I can reuse, but so far I've come up empty. In the back of my head is a little voice telling me to just get one of these: http://www.blackrockdomes.com/greenhouses.html
[Last edited by psa - Oct 23, 2014 8:24 PM (+)]
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Name: Sandy B.
Ford River, Michigan UP (Zone 4b)
(Zone 4b-maybe 5a)
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Weedwhacker
Oct 25, 2014 3:06 PM CST
I'm looking forward to seeing what you decide on, Paul; what about the dome that you built a few years ago?
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Name: Paul Anguiano
Richland, WA (Zone 7a)
GW & DG: tropicalaria
Forum moderator Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Garden Sages Garden Photography
Enjoys or suffers hot summers Tomato Heads Organic Gardener Greenhouse Native Plants and Wildflowers Herbs
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psa
Oct 26, 2014 12:09 AM CST
Weedwhacker said:I'm looking forward to seeing what you decide on, Paul; what about the dome that you built a few years ago?


The dome is about eight years old now and doing well--I overwinter all of my personal cold-sensitive plants in it. Most recently I've added an aquaponics system to it, which I've posted about over on Dave's Aquaponics thread in the Permaculture forum. I'll be heating mostly hydronically this winter, I think.
The thread "Aquaponics" in Permaculture forum

The dome has exceeded my expectations in its ability to shrug off 70 mph winds, ice storms, small children swinging lawn tools, and wild animals. I plan to build another one, possibly larger and better insulated, as soon as I find some new property to build on. It's a lot of work to fabricate the parts, though, and I can't count on my ability to put up a large enough structure in time for the growout of next spring's retail plants.

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