Has anyone tried to make thier own clips from slightly larger diameter pvc cut into short lengths and with a lengthwise section cut out?

Other solutions? There must be something obvious I'm missing. Last night was our first freeze. I think I squeaked by, but I need to do something more durable today!!!!!

A cheap alternative is to simply burry the plastic along the sides by shoveling soil over it along the entire side. Clipping on the end arches is then still an option or you could close the ends by tying the plastic(extending at ~2times the height beyond each end) in a bunch and securing it at the ground with a heavy stake. I usually do this with remay fabric over a canopy frame and it works pretty well. I should mention that I purchased plastic clips for holding tarp onto 1" canopy frame this fall and I can't recommend them. They are very expensive for a plastic clip; they have a tendency to break when stretched over the pipe and they weaken the material even to the extent of tearing it.

bmoser -- I looked up wire-lock systems, and they seem perfect for securing plastic sheeting to a wood or metal pipe base, but this is a temporary structure that I only need for this winter. This property is being sold and the new owners are allowing me the space for this greenhouse until I established at a permanent location for my rapidly growing (but still in start-up) rare plants business.

The sale of the property, including the good greenhouses I've been using, was unexpected, so I am scrambling to save my plants.

For now, I have driven 6' rebar a foot or more into the ground, spaced 4' apart, and slid sun-resistant pvc conduit over the rebar to make the arches. There is one central purlin. There isn't time (with the first freezes setting in) to build wooden ends, so those are also stretched plastic.

I have bought 6 mil. plastic sheeting in 10'x 25' rolls. The arches are exactly 25', so there is no extra for burying. I'm thinking I'll staple the bottom to scrap lumber with batting strips.

HERE'S MY REAL PROBLEM: (1) I need to secure sheeting to the ends (which, in this location will have to take a good bit of wind). I will try the black poly pipe clips BD suggested, and I'm open to other ideas.

(2) Then I need to secure the first sheet to the end arch. Again, the black poly pipe might work.

(3) I need to connect the successive plastic sheets together over the arches every 10 feet. I don’t see how the poly pipe clips would work here. Right now, all I can come up with is pulling the overlaping sheets together on the inside, folding it over and stapling it in a fold of denser plastic (milk carton) as batting.

(4) I’m not sure how I’ll manage an entrance on the other end – maybe just overlapping flaps.

(5) For heat, I have a 2’ tall, forced-air, electric heater and a portable, electric, oil-filled radiator. I can put a box fan behind the radiator to circulate the heated air. I’m concerned that plain radiant heat would go straight up and dissipate through the cold plastic. Any input on these ideas?

I’m putting down black ground cloth, which might help keep the ground warm. Is it better to put plants directly on the ground, so they’d get ground warmth, or to put them on pallets and benches to benefit from warmer air circulating above the ground?

I’ll be grateful for any helpful ideas.