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Old 06-11-2021, 02:06 PM
 
Location: South St Louis
4,311 posts, read 4,165,623 times
Reputation: 2968

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I have an outdoor enclosure for a hot tub, perhaps 10 foot square. It has a large skylighted roof and windows on all four sides, some of which can be opened. The south-facing windows are partially in the shadow of another structure. The whole enclosure sits on a patio made of paving stones. There is electricity ran to the structure, and there is a propane heater available for the winter.
Eventually, the hot tub will have to go, leaving a totally empty structure. Every autumn, when cold-sensitive plants need to be brought indoors, it’s a challenge finding enough suitable space in the house for all of them. So it seems logical that this outdoor enclosure could possibly be modified for use as a greenhouse. However, I have no experience with greenhouses and am wondering what steps would need to be taken to repurpose the structure. Does anyone have any tips? Thoughts? Advice? Thanks.
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Old 06-11-2021, 03:07 PM
 
Location: East of Seattle since 1992, originally from SF Bay Area
39,433 posts, read 70,760,196 times
Reputation: 47857
If you get overhead sun for 6+ hours a day it should be great, maybe grow vegetables in spring-fall before moving in your sensitive plants. My greenhouse is blocked by the house but gets 2 hours morning, 4 hours afternoon, and my plants do great. I would put in a U-shaped raise bed with 2x6s, so you go in the door and have access to the plants on the sides and back. and the water should drain through the pavers. For watering I would use a drip system on a timer, but if you get freezing weather you will have to protect the timer/faucet and the tubing to the greenhouse with insulation or bury it. My timer is in the laundry room, connected to the wash tub faucet, and the tubing goes through the wall into the garage, across the garage rafters, down and out, then is buried and protected by 1/2" PVC pipe the rest of the way (15') to the greenhouse. I also have a remote transmitting thermometer in the greenhouse so sitting in my recliner I can see if it needs heat or opening up for air. The only real problem is that bees don't go in, so for squash, cucumbers, and peppers I have to hand pollenate.
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Old 06-12-2021, 04:23 PM
 
Location: South St Louis
4,311 posts, read 4,165,623 times
Reputation: 2968
Hemlock, you’ve addressed some important issues. I hadn’t thought about how to water the plants in sub freezing temperatures. And you’re right, even if the greenhouse door was left wide open, it’s doubtful that bees would fly in. There sure is a lot to consider.
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Old 06-12-2021, 06:09 PM
 
20,049 posts, read 5,957,085 times
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Can you please post a picture? We have had a temporary winter structure for 25 years and several houses heated but the daily used hot tub.
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