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Greenhouse on the cheap.

 
gardener
Posts: 621
Location: N. California
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I have always wanted a greenhouse, probably because I was allowed to play in a very cool greenhouse my mom's friend had when I was young., Of course that was in western Washington where it was beneficial.  For my birthday 2019 I found a basic one half price at Sam's club. My daughter got it for me.  I put it together in January 2020. I started seeds in my new greenhouse.  It was definitely a learning experience.  Things started off well, but went down hill in a hurry.  I live in Northern California, and we had a little heat wave ( in February believe it or not) and fried a lot of my little seedlings.  I got tons of bugs.  It wasn't a total fail, I got lots Of veggie to plant and give away, and I learned a lot.  
The main thing I loved about my little greenhouse is just having space to start a bunch of seeds where my cats can't eat them, and the chickens won't dig them up.  The greenhouse is a 4'X4' aluminum frame covered in clear plastic.  The plastic had a few rips I planned to use a strong tape to fix.  Yesterday we had a very strong wind storm.  More windy than I remember. Lost power for 13 hours.  Lots of property damage.  We were lucky, lost 2 metal roof panels on the barn, but that's easy enough to fix.  My greenhouse on the other hand didn't survive.  It's now a naked frame.  I used large chunks of concrete we had hanging around, to anchor it down, thank goodness, I'm sure it is why the frame didn't blow away.  I would like to fix it, but don't want to spend a lot of money.  Partly because I'm still learning, second I  can only use it a couple months out of the year, because we have wonderful weather, and I don't really need it.  Does the plastic I use have to be clear?  I have some strong inexpensive plastic,  it's clear but it is cloudy.  I want my little seedlings to be able to absorb the light they need.  I would just cover the hole thing using duct tape to hold it tight.  I could use the cloudy stuff on the bottom, and buy the clear plastic for the roof.
I have a bunch of that wavy metal roof panels.  What if I put it around the bottom. Then buy the plastic version of it for the rest of the sides, and roof.  The plastic panels are 8'X2' for 17.00$. So about 34.$ if I can make two work.  Does anyone know if I can cut those wavy plastic panels?  I thought I could use screws to attach the panels metal and plastic to the frame.  Then maybe use silicone to seal all the seams.  I also intend to make a frame for screen and a cover for that so I will have ventilation while keeping some of the bugs out. (I will do this no matter the material I choose because I think lack of ventilation was a major flaw in the original design.) There would be one on each end.  
I would love to hear what your thoughts are.  I would just like my little greenhouse not to cost much, and it would be nice if lasted more than a year.  If I get the hang of it some day I would love to build a greenhouse out of old windows, and glass doors, ect. to be a permanent greenhouse/ garden work space.  That dream is for the future.  Anyway thanks, happy gardening.
 
Posts: 101
Location: Far Northern California Coast, Far South Pacific Northwest
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Those aluminum frame kits are not meant for our winds!

For seedlings any plastic that lets light through works. Have you looked online for uv rated sheets? You may be able to find some better quality stuff for around the same price. We bought a 24x32 sheet for about $75. I'm thinking you could use half of that for what you need.

When we cut fiberglass panels many years ago I believe it was a plywood blade mounted backwards so it's more heat that edge cutting.
 
Melonie Corder
Posts: 101
Location: Far Northern California Coast, Far South Pacific Northwest
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Hit submit instead of attach...

A bomb cyclone last winter picked this up and tossed it about fifty feet into our fence. We had even mounte 4x4 pressure treated wood all around the bottom to give it a chance in our winter storms. Wasn't enough!

This greenhouse could probably be constructed for under $300 (definitely can if lumber prices ever go back down). It was far cheaper for us because we used things we had on hand. The cattle panels, lumber and fasters were already here. We had to purchase the plastic, uv rated and supposedly will last five years. The design could be simplified, we mounted on posts so we could lift the side flaps for passive air flow. It could even be cut in half.

The round design seems to hold up to the wind much better. We were watching it over the past couple days and didn't see any significant movement or effect.

Came back to add that I'm not sure why I thought we needed a "floor". Mostly to keep from having to weedeat. We now plan to pull the plastic and deep mulch with wood chips. That way I can use the ground in there!
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Our kit after last Jan "bomb cyclone"
Our kit after last Jan
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Almost finished replacement
Almost finished replacement
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Interior of new greenhouse
Interior of new greenhouse
 
Jen Fulkerson
gardener
Posts: 621
Location: N. California
223
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Thanks Melonie, I like your greenhouse a lot.  It seems strong, but design I could probably manage. A great design for the future.  For this year I would like to repurpose what I have, since now is when I need it.  I will definitely look into the uv plastic. Thanks for the tip.  I would love to see what you grow in your greenhouse, and how it works for you.  Thanks 😊
 
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Ooh damn, that looks very familiar Melonie... A few months back, while WWOOFing, I helped dismantle a capsized aluminium-frame greenhouse. In that case, though, the culprit was an insanely heavy November snowfall. The host's neighbour lost his bet though (he thought the wind would take it first...)
 
Jen Fulkerson
gardener
Posts: 621
Location: N. California
223
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It's done.  Time will tell if it will last more then one season.  I enjoyed making it.  Took me longer then I expected, cost a bit more then I wanted and I made tons of mistakes, some I fixed, and some I decided to live with.  All and all I enjoyed the process and learned a lot.  Mostly I was struggling with how to attach the plastic. Originally I thought duck tape, but I decided the sun would melt the glue on the tape and I would just have a mess on my hands this summer. My son came up with the idea to put a wood frame around the perimeter of the greenhouse frame, and attach the plastic to the wood.  I'm a little addicted to the clearance wood at Home Depot,  so I had an assortment of wood I got at some point cheap.  My primary objective when it came to building the door and door frame was to keep it light. (the original greenhouse frame is made from aluminum and plastic after all) The door was a challenge for me.  I am not a builder which you can clearly see.  Needed to be light, and strong enough to open and close a million time, and I wanted to have a screened in window of sorts that could be closed or open depending on the weather.  I am happy with the way it turned out. The wood on the back of the greenhouse is there to secure the plastic at the end, also to create a little screened in window.  that windows plastic is scoured on top with the frame and there is a piece of wood at the bottom to hold the shape and give a bit of weight.  I put Velcro on the sides and bottom (had to put a couple of nails in to keep it in place) Again lightweight, and I can open a little, or a lot. I used one piece of plastic draped from one side of the greenhouse to the other side, and the ends secured with the door frame, and back wood.  When I finally finished I laid some cement bricks in front of the door to make it easy to open.  I pulled the weed and some of the woodchips away from the perimeter laid down cardboard and dumped woodchips on.  Then I decided I worked so hard I wanted it to look nice, so I added a few fun items.  The only thing I bought for this greenhouse was the plastic for 26.00 (the plastic I had was only 3ml, and I read I needed at least 6ml.) The Velcro, which was 6.oo but I have a lot left. And the big white flower on the front, which I got for 7.00.  More then I would normally pay for something like that, but it was just what I wanted (I needed something to cover the terrible job I did at attaching the X in the window)  everything else I already had, or made with what I had.  Oh I forgot the solar light.  They cost me ten for the pair.  Total splurge, but just the touch I was looking for.  I know it wont last long with the California sun, but I have lots of plastic left over, so  redoing it will not cost anything and can be done pretty fast.  I hope as time goes by I will accumulate enough windows and glass and knowledge to build a real greenhouse.  Until that time comes I will enjoy this one.  My daughter who bought me the greenhouse was super happy I fixed it and didn't just throw it away, so that's icing on the cake. (silly girl, knows even when it's done being a greenhouse it will end up repurposed for something else.)  Now I can reclaim my dining room table and give my seedlings a new home.  Thanks all happy gardening.
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pollinator
Posts: 1696
Location: RRV of da Nort
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Just out of curiosity, Jen, do you plant enough seedlings that a garden window would be out of the question as a new installation on the south side of your house?  Depending on the timing of planting in the spring, you may be able to get a number of crops started as seedlings in such a window sill.....AND not have to worry about winds, overheating, and the surprise cold snap!  Maybe of some use?.....
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Jen Fulkerson
gardener
Posts: 621
Location: N. California
223
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I would love a garden window. Maybe when we redo the kitchen in the future.  Thanks
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