OK I think I may have found an answer to my own question. lol This artile (link below) says "The low tunnels should be vented if the outside temperature reaches about 70°F and opened to catch precipitation if excessively dry." And that's with plastic, not Agribon - so I'm thinking it will be OK not to vent them. But that very informative article has led me to anoter question...should I be covering them with two layers of plastic instead of the Agribon to extend it even more into the cold months? Here is a link that might be useful: http://www.uvm.edu/sustainableagriculture/Documents/HighTunnels_SelectingStructure.pdf

The front, sides and half of the back look gorgeous, but most of this stuff is going into the other half of the back. I just evicted most of the kid stuff, including the gigantic fort they never use, so it's go-time back there. Once it grows in and the mosquitos disappear, we're going to want to live back there. Does anyone in the Dallas area need lantana? I've got way too much lemon cream and peach, and you're welcome to take some. I might make you take a portulaca hanging basket, too :-)

Right now my back yard is pretty full of bromeliads, and I have I don't know how many different kinds, from pineapple to Portea petropolitana extensa. I also have Meyer lemon, Eureka lemon, blood orange, Kaffir lime, bay tree, white sapote, cherimoya, avocado, banana, papaya, Fuji apple, Bearss lime, and some shrubs. I also have a large collection of orchid cactus (epiphyllum) and a small collection of orchids, mostly epidendrums and cymbidiums, plus some cattelaya, dendrobium, and several others that I do not know the names of. I have one tiny orchid that makes flowers with an intense coconut fragrance. I also have quite a few South African succulents in the back yard. My dill is making flowers now, but I have basil, chives, Greek oregano, Italian oregano, and rosemary. I used to have some mint, but I don't know what happened to it. I also have a couple of chocolate Habanero plants that appear finally to be growing, but I probably won't get chilies from them until December. Here's a bromeliad that is just now blooming after my having it almost four years:Vriesea Mint Julep. Here are some more bromeliads in the pergolaHere are some in the back yard in front of my pitaya plant:I have to keep moving them around, and some of them cannot take too much sunlight, which makes this a somewhat difficult time of year. Anyway, I am trying to make my back yard a very pleasant place to relax while I am recuperating. I very much enjoy looking at all my flowers plus the hummingbirds and other birds that visit the yard. I need to clean out the fountains, but that can wait.

All, today I stopped at Lowe's @ 1604 & Blanco in San Antonio and found they are selling a bunch of: 'miracle on the hudson', 'kardinal kolorscape', 'lemon fizz', 'drift', and 'double knockout' roses in 2gal sizes for $5. I didn't buy any, but they looked good.