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joeschmoe80

insulated, windowless barn for overwintering dormant plants?

joeschmoe80
11 years ago

I'm brainstorming here. I've been thinking about starting a "backyard nursery" to grow trees for resale in containers. Since our winters are cold, overwintering outdoors in pots is diffcult unless you:

1. Mulch up all around them
2. Do a "pot in pot" system, which requires drainage, labor, etc, etc
3. Move them to some structure in winter to keep just above freezing.

While I am not sure whether the two-time HEAVY labor needs of moving several dozen to a couple hundred 1 to 10 foot trees is less than mulching them up, it seems worth considering this option:

I don't need a "greenhouse" as this would solely be for the purpose of keeping deciduous dormant plants dormant, but not frozen to protect the roots. I already have a well built wood pole barn 40' X 30', that was here when I bought the place, has a concrete floor, drainage, electricity, and a spigot. I could put up R38 insulation on all side walls and roof, it would fit, but currently it's unheated and uninsulated, but it IS sealed rather well (I'd put in a better-sealed door on each side).

Right now I only use about 1/4 of the floor area for things like equipment, mower, etc...so my thought was, why not insulate it and heat it just to maybe 35 degrees and use it to move the container trees into once they go dormant, then yank them back out in spring?

Although on the surface, mulching seems "easier" - the labor involved with getting large quantities of mulch and then cleaning it up seems more or less equal to moving them into a climate controlled location, where winds, ice, snow, etc. are less likely to be a problem...I dunno.

If I were do to this:

1. Since it will be a fully insulated, windowless structure, how do I calculate BTU needs for heat?

2. With no direct light inside, would there be any chance of getting TOO warm on sunny, warmish days to where early breaking of dormancy could be a problem? If so, would a ventilation system like a greenhouse would have be worthwhile, or would the heat loss from fans and shutters override the benefit?

3. Would it possibly work to just heat the concrete floor, since it would radiate upward into the containers? The tops of these trees would all be fully hardy in my zone, it's just the roots I want to keep above ambient temps. If this setup were possible, how would I calculate if the heat could move "up" far enough into the containers to do what I need it to?

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