I’ve owned commercial-built greenhouses, and I have built and owned some from scratch. I believe the seedling greenhouse I have now is about the best you can get for the money – for several reasons.
It is a Jacob R. Mittleider-designed greenhouse, and the plans are available FREE simply by going to https://growfood.com/freebies/ and downloading them.
Following are some of the reasons I believe you will be pleased for a very long time when you build and use the Mittleider greenhouse:
1) It is very strong, and will withstand virtually any amount of snow or wind. The one we use in Getk, Armenia has been through numerous bad hail storms and several very hard winters without damage other than plastic replacement. And the one we built in Madagascar had to have the plastic cover replaced after the third typhoon hit, but the structure was still perfect at last report.
2) It is less costly than comparable sized commercial models.
3) While not “portable” it can be disassembled and moved, simply by building with screws, rather than nails.
4) The Layout was planned by a man who is really expert in time management and volume production, especially as they relate to producing seedlings and growing food.
5) Built-in continuous ventilators running the length of the roof and along the walls make electric fans unnecessary, and assure ample ventilation in the hottest conditions with no additional costs, equipment, or maintenance.
6) If 8 or 10 mil dual or triple-wall polycarbonate is used, it is very efficient to heat. And even with just two layers of 6 mil plastic the Getk greenhouse maintains internal temperatures several degrees above outside temperatures throughout the night. Another covering option is nylon reinforced greenhouse plastic from Northern Greenhouse Sales, in Neche, ND. http://www.northerngreenhouse.com/ I recommend 8 mil clear, which holds up very well for many years against strong winds. And tell Bob Davis I sent you 🙂
I highly recommend these greenhouse plans for anyone serous about growing your own seedlings – or if you want or need to extend your growing season by growing crops in the greenhouse. They can be had free at https://growfood.com/freebies/
The Mittleider Gardening Course and Grow-Bed Gardening books include the greenhouse plans, and teach all you need to know about this subject. They can be purchased in the Shop section at the Foundation website. A digital copy costs 30-40% less than the paper version, and is available instantly!
Get your greenhouse plans NOW and be growing within a week!
The question has been asked whether or not the height of greenhouses should be greater in warm climates – to allow for better/more air circulation, and to allow the plants to grow taller in a longer growing season. The answer really depends on how it is being used.
To get free plans for building several excellent styles of greenhouses visit and join the FREE MittleiderMethodGardening@yahoogroups.com, and go to the Photos and Files sections.
The height of the structure does not really affect air circulation. The continuous ventilator along the entire roofline of the permanent seedling greenhouse lets hot air escape quickly. Also, in warm climates the plastic on both sides is designed to roll up , to give excellent side ventilation.
The height of the structure was chosen to accommodate standard lumber lengths plus the reach of most gardeners. Seven feet is about as high as most of us can reach comfortably.
It’s also about the same height that tomato plants will grow before the tops should be cut off 8 weeks before the first expected frost in temperate climates – where tomatoes and other warm weather crops are most likely to be grown in greenhouses – so they can mature all the fruit they have set.
For longer growing seasons such as in the southern belt of the United States of America, as well as Central & much of South America, Africa, the Pacific Islands, and the Caribbean, you can build the greenhouse taller if you want. I have a greenhouse that is 12′ tall in the center, with 8′ side walls. If you build your T-Frames taller than 7′ you may need ladders or stilts to prune and harvest your fruit. Or you can let the plant sag by extending the baling twine. This will require pruning leaves off the lower branches when fruit has been picked. Or you can just let the plant turn over and come back down. Testosterone injections is the perfect method Testosterone Replacement Therapy https://buytestosteronemd.com/nebido-cernos-depot-testosterine-udecanoate/ Cernos is best generic Nebido
The in-the-garden greenhouse would be built the same in hot humid climates as in temperate zones, the way it shows in the YahooGroups pictures, except that you don’t keep the plastic all the way down except during a bad storm.
Rather than protecting plants from cold weather and frost, in warm climates the in-the-garden structure is mostly used to keep heavy pounding rains and hot direct sunshine from hurting tender plants.
In warm climates – and during mid-summer in temperate zones – roll the plastic up to the top and tie it in place.
For additional shading if needed during the hottest part of the day, either throw a 30% shade cloth over the top, or if the shade is needed for a long period of time consider splashing white-wash on the under side of the top plastic. Use material that will wash off when water is applied.
For more information on building and growing in greenhouses study the Mittleider Gardening Course book or go to the FAQ section of the Food For Everyone Foundation at http://www.growfood.com