by Jenny-the-Bear (grr) » Thu Oct 30, 2014 6:01 am
The roofing metal works a lot better than the cinderblock. It hold the moisture much better, and they last a very long time. And, as you say, they're quick to build. The smaller of the 2 metal sided ones, the one with the PVC pipe frame, has been in use for over 12 years, and it's hanging in there just fine. The larger one, Del sank 3" PVC pipe at the corners, and put another in for support about every 4 feet. No bottom or top rail at all. I do like the smaller one with the top rail better, I snag my clothes on rough spots on the longer bed. The could be easily dealt with, I just have to get out there and put something over the top edge. That would give me something to lean on, too.
The only other thing I'd do differently, next time, is paint the metal first, inside and out, with rust-stop paint, and some kind of durable sealer on the interior side, and a coat or two of exterior spray enamel in a nice color. Partly just because it would be more attractive, and partly to increase the lifespan of the metal.
They're good for growing a lot in less space, with the bonus of only having to weed for the first part of the season, until the plants get big enough to out-do the weeds. Much easier to tend than growing in-ground. I can mow around the beds, and use the weed-eater up close. Beats the heck out of weeding with a hoe all summer long. Less water usage, too, because It's not running off between the rows, like ground crops.
Except for the cinderblock bed. It dries out a lot faster than the others. I might be moving to a different location sometime in the next 2 or 3 years, or I'd take that one apart and replace it with another metal one.