Just bought my first home, very modest size but a nice comfortably sized yard to start a garden. ? Hot and humid here in Baton Rouge. I have been growing roses in pots literally for decades. It'll be great to get them in the ground. Main problem is I just discovered my ground is pretty dense clay. I have started digging the sod from the first planned flower bed. It is slow going, especially since it is so darned hot here. Two weekends in, now and I am just two thirds done with the first and smaller of two beds that are to be for the roses. I feel like I have nearly had heat stoke a couple times. Bleh. I am going to have to build borders to raise the beds a bit, thanks to the damn clay. I am wondering if 6 inches will be enough of a difference for drainage. Any more than that and the edging material starts to get expensive. I used to like using landscape timbers, because they are relatively cheap, but the Lowe's and Home Depots have stopped selling them here, I am told, because they rot in a few years in this climate. Any thoughts or suggestions?