How to construct a Greenhouse using Free supplies (ideas + pics)

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On top of planning the construction of our Cob home, we are planning to construct a Greenhouse using free supplies.

Greenhouses allow you to extend your growing season up into the Winter, and grow your starter plants earlier in the season. Plants like Tomatoes, peppers, and melons have a long growing season, which is why it is crucial to begin these plants as early as the beginning of February.

I have the fortunate opportunity to use my home (Mother's house) as a greenhouse. I started many vegetables indoors at the beginning of March, and had to keep these plants indoors up until April till I could sit them out during the day. Even then, I had to bring my starter plants back in every night until the beginning of May. You can imagine my Mother was shocked to have so many trays of growing plants taking up half the living room, utility room, and our bedroom.

Luckily at the beginning of May I have been leaving the starter plants on the front porch even at night. For two months, my morning ritual began by taking all of my starter trays outside on the porch, and at night I would bring them all back in the house.

I may have to construct a small greenhouse by myself due to all the other upcoming projects we have. My partner has recently taken on remodeling my Mother's kitchen, so the garden has been on the back-burner. I have been transplanting more Tomatoes in the garden but the last 40 I have planted have died!

The perfect Greenhouse would be large enough to house hundreds of starter plants, and even fruit bushes and fruit trees. I would even like to construct a greenhouse that was half underground and half exposed for growing tropical fruits. For now I would start small, 20'X20' Greenhouse. We have thought of many different designs, for example a recycled bottle greenhouse (like in the picture below).



picture source: Khakibos

Another cheap Greenhouse option is using transparent plastic with recycled wood, see below. Considering I do not drink water from plastic bottles, and because constructing with plastic bottles would take longer-- a 6'X10' greenhouse with recycled wood would also be a simple, cheap construction. You can easily find wood pallets (for free) at sawmills, factories, and behind other stores. Wood pallets can be deconstructed in order to use the wood to create the structure of the Greenhouse. I have posts on how we constructed raised beds out of wood pallets here and here.



picture source: Bepa's Garden

A third option are polytunnel designs using PVC pipes. Polytunnel designs are equivalent in efficiency and cost, it simply depends on the materials you can scavenge for free or have around your house. Piping is easy to come across, as you can ask many people if they have any around, or go dumpster diving.


picture source: Home design

There are of course simpler Greenhouse methods that need no construction, for example in the picture below, you can purchase a small, pre-fabricated Greenhouse at many store outlets. However these come at a higher cost. Even a mini pre-fab Greenhouse as the one in the picture below may cost as much as $40, the same cost for all the Transparent plastic you would need to construct a much larger Greenhouse.




The cost of a 8-ft L x 6-ft W x 6-ft H Metal Polycarbonate Greenhouse at Lowe's is up to $800. Similarly, Palram 6-ft L x 4-ft W x 6-ft H Metal Polycarbonate Greenhouse at Lowe's cost up $500. Much larger Greenhouses, Palram 16-ft L x 8-ft W x 8-ft H Polycarbonate Greenhouses at Lowe's cost more than $2200! What would possess people to pay that much money when they could construct the same size Greenhouse for a 1/20 of the cost?

Original post @ How to Construct a Greenhouse using Free Supplies from Vegans Living off the Land
 
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You certainly have plenty of options so now you have to decide how much time you have to build it and what you want to build it out of. You don't say where you live which can make a big difference. Winter weather can be rough on even the stoutest of greenhouses.
 

Pat

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You do give many options on building a greenhouse at a fraction of the cost of going to the building supply store. I also like to re-use what I already have to cut the cost of what ever project I am working on. The glass bottle greenhouse is interesting, my question is how many bottles would you need to construct a unit like you showed in the picture.

I hope to have a greenhouse soon to extend my growing season, when I lived in California I could grow plants 12 months of the year and I really do miss having that available to me.
 
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You certainly have plenty of options so now you have to decide how much time you have to build it and what you want to build it out of. You don't say where you live which can make a big difference. Winter weather can be rough on even the stoutest of greenhouses.
Yes weather can be rough on them. Some people have built them out of cob to retain heat and withstand winds, which would take much more time.
I live in Kentucky, the winters are mild but this passed winter was the worst in 30 yrs, having several feet of snow and temperatures below -20 degrees, which is rare!
 
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You do give many options on building a greenhouse at a fraction of the cost of going to the building supply store. I also like to re-use what I already have to cut the cost of what ever project I am working on. The glass bottle greenhouse is interesting, my question is how many bottles would you need to construct a unit like you showed in the picture.

I hope to have a greenhouse soon to extend my growing season, when I lived in California I could grow plants 12 months of the year and I really do miss having that available to me.
I am not sure how many bottles it would take. Judging by the photo, 900-1000 bottles.
 
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I appreciate the stance on recycling, but surely it would be easier in the long run to buy one in kit form.

We have just gained a second greenhouse for our allotment, and it cost us nothing, all I had to do was remove from where it was, the house was being sold, and the owner had died, the family wanted the garden cleared.

You could check the small ads, there are often greenhouse advertised in there at a fraction of the new cost.

Beware of polytunnels, they are a specialist construction ! you cannot use just any poly pipe, and the covering has to be stretched over the pipe, you also lose about a metre of growing space at the sides because of the curve.
 
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I like the small one, as much as we (my husband and I) would like to have a large greenhouse, I think our HOA would have an absolute fit if we put a large greenhouse in our backyard. Unfortunately, everything and anything that we do has to approved by our HOA first or be unseen from the street. :/
 
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I love the greenhouse in the second picture. It looks really lovely! I like everything about it:) I've never built anything, but now I'm tempted to try:) Thank you for sharing so many great ideas, Cassie K!
 

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