A double u channel is used so you can use smaller pieces of plastic. You use one piece to go over the top, hook it into the top channel on the side of the greenhouse, then hook a shorter piece to finish going to the ground. It's really not necessary though. We use just a single channel and put in two wires if we need to. You can actually fit three wires in there and they hold, because that's how we put on our shade cloth, right over the other plastic. I really like the Farmtek 20' round style solar star greenhouse I purchased last winter. But I do wish it was larger, just like everyone will warn you about. A greenhouse is never big enough! We have had 8" of snow last January, and 60+ mph winds several times and so far so good.It's held up well so far. It's worth the extra money to get their heating package, the thermostats and heaters are great. I'm not wild about the louvers on the exhaust fans that we received, they need to be motorized because they flap around when not being used and lose a lot of heat. I tape them each night with a piece of masking tape to stop the flap, and if the fan kicks on, it breaks the tape. Unscientific, but it works. The roll up sides are totally worth the money in my opinion. If you're going to get Farmtek's high tunnel with the zippered ends, I've heard that the zippers don't last. We get a LOT of wind here, and I wouldn't be able to sleep at night without the double poly inflated top. It keeps the plastic from moving around and keeps it on the greenhouse. That is a smart move. Sandy Here is a link that might be useful:

Hi, looking for carlas Sonshine,and a few Pink Night bloomers. Will trade Marginals, Bog lilies, yellow, blue flag Iris, Parrots feather, Variegated water celery, Lizards tail, waterpoppies,cannas,blue rush,Giant water snowflake Waterlilies, Pink Capensis... blooming, Hornwort, or what are u looking for. Have crinums , land plants, butterfly host seeds , tropical plants. Thanks, Diane

RE: Vietnamese coriander (perennial cilantro) If you can ID it I think I can provide it. I've been weeding out what I think is Rau Ram, Vietnamese cilantro all summer from my Seattle P-Patch plot. I also have another Vietnamese herb (little water lily like leaves) that is very invasive and haven't ID it yet. I've seen it eaten fresh in Vietnamese lettuce wraps on a TV program. Other P-patch gardeners say it is edible. Are you interested in Houttuynia  Chameleon Plant, aka "fish mint"? I use this in some salads. Borage seedlings are available. I have Greek (white flowered) oregano, and a I can provide cuttings from a couple of sages. I'm looking for lots of Garlic chive plants for the P-Patch Giving Garden and can always use manure!

Yes, the Thomas Lee sleep cool and they just keep feeling better with age. The pillow cases are wonderful! I'm a cheapskate at heart and it pained me to buy such expensive sheets but I decided to give it a whirl. After the first use loved them so much that we never wanted to swap out for our other sheets, thus that set of sheets was washed weekly for 3.5 years and put right back on the bed that evening. They have held up perfectly. I doubt that if I had subjected cheap sheets to that same treatment that they'd be in one piece! If you're looking for no iron then these aren't for you, as they do look a little wrinkly. I've found that the older they get, the smoother they get though and the wrinkles don't bother me. I honestly won't ever bother getting other brands of sheets again.