This leaves me with a bunch of old 2x4's. They were very inexpensive - about 90 cents each, and are in good shape.
One project that I've been wanting to do is make some square shaped borders around a couple of fruit trees, and around the blueberry hedge I just planted. I have the lumber, but my previous experiences of:
1) painting 2) staining 3) Thompson's Water Seal 4) polyurethaning
did not turn out that well. I am tempted to try using boiled linseed oil on the wood, and see how well that works as a preservative. The other times I've tried it in the past, the wood has always cracked and warped within a couple of years. Considering how cheaply I can get these, I'd be happy if they just lasted 6 years laying out there in the yard.
Can any of you recommend a widely available method for treating these boards so that they will last a bit better when used as borders for beds and for mulch around fruit trees? I'd like to get on this project within a few days, to make my yard look neater, so I thought I'd check on here to see what the experienced folks had to say.