The painter's plastic will last less than a year in the sun, then it disintegrates and makes a big mess. Real greenhouse plastic is worth the money; it's not that expensive. You would be well-served to put some white latex paint over your pvc pipe, and it will last longer, too.

Ventilation is important. Ideally you would have a little window or door at each end, oriented to the prevailing breeze. Without ventilation, your greenhouse becomes a solar cooker. You can get 60+ degrees over the outside air temp.

There is a hydroponics forum on this web site that you might check out for hydro ideas.

Thank you for the advice. I live in Florida so it would def get pretty hot, but it also rains a lot and that was the main reason for the greenhouse at first.

The white latex paint sounds smart ecspecially for the joints since there are the costly pvc parts. As for the plastic, I saw polycarbonate sheeting, but it was very costly so I went with the $1 plastic with the idea that I could easily replace it if anything happens.

I put up a picture showing a possibly way to hang the plastic over, and maybe leave the short side open to the wind?

I am kinda putting the aeroponic idea away for another day because I'd rather have a method that doesn't need to spray water for 10 seconds every 30 minutes.

Something I could water without all the noise of a pump all the time. I was looking at ebb and flow systems, but am concerned that being outside will cause algae to grow on the growing medium rocks.

Also I am still trying to decide on what kind of shelving material to use that can support plants and run long ways through the greenhouse?

Thanks!

P.S. Some of the original ideas came from the product in the link below.

Here is a link that might be useful: Raised Greenhouse

The best clamp to hold your plastic to the pipe is a slightly larger piece of pipe cut in half long-ways. You can make your own with pvc. I'd use screws to hold them down.

I still think that painter's plastic is going to give you headaches. I looked for a place that sells small amounts of greenhouse plastic, but it's apparently hard to find. I looked at greenhousemegastore.com and farmtek.com

Remember to anchor it well against high winds.

I can buy gh plastic at my local gh for $4.50cdn a lineal foot (24 ft. wide) After you pick up a gazillion little pieces of plastic, you will wish you had made the purchase. Lee Valley Tools sells the plastic clamps to hold the sheeting to the frame without tearing it. And unless this small structure is bolted/anchored down real good, you'll probably find it in your neighbor's yard :-(
The general gh rule is the bigger the better. The larger the volume, the easier it is to control the temperature flucutations.

Here is a link that might be useful: Lively Dirt - The Garden Blog

I finally got up design try #1. The main goal was to help the potted plants against the crazy amount of rain we can get here in Florida at times. I am attempting to grow some dancing plants, and they seem to do better in the slightly shaded sunlight in the greenhouse.

The plastic clamps made by greenhouse companies worked perfectly, and it is a larger diameter PVC pipe, but also has ridges to keep the sheeting in place.

I feel as though I should measure temperature, humidity, or use some other type of way of finding out if the greenhouse if worthy of being called such.

My next step in this project is going to be to build a NFT hydroponic system using square vinyl fence posts. (5âÂÂx5âÂÂx8â cut in two 4â rows)

The pump will be powered by a solar panel, which I must carefully test out, and I also am unsure how much plants need to be feed when the sun is down; outdoor hydro is not as common I donâÂÂt think.

Here is a link that might be useful: Solar Powered Pump