My question is can I use presure treated lumber?? funds are limited so plastic is out of the question and im afraid untreated lumber will not last. beds need to be 4x8 and at least 3 feet high.
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No on pressure treated lumber. Redwood cedar may be too costly. Untreated lumber would last for a number of years. Search a salvage yard for oak beams, concrete blocks, bricks; just don't use mortar. I'm unsure if you would want to try tires. Stack fill with dirt as you build the wall. Not sure of any possible leaching of chemicals tho they would last for ages. Seems the major challenge is the 3 feet high requirement. Need to consider something that will not collapse from the pressure of the dirt. Ideally, inter-locking landscape blocks would hold the best but suspect exceeds your budget. Assume that's for the seniors ease of access.
Once again Sweet Pea is throwing money at a problem instead of reading the content of the question. While checking out the ft2 gardening book doesn't cost anything: peatmoss, humus vermiculite DO! Call local painters ask if you can have their scrap plastic from paint jobs. Or call your local United Way ask if they know of an agency that will help fund your project. My Grandfather used pressure treated oval 3X4X12's to border his garden hold down the plastic his garden was always amazing. Incidentally he got his plastic in the paint section of Big Lots! It was the most expensive of his garden props but he was elderly couldn't weed. Maybe you could contact local churches find if they could get their youth groups behind the effort? Untreated lumber will warp easier be at the mercy of the elements but it will at least last you 12 months. If you cant buy lumber you can always use rock to border with. A low rock wall would be even more durable but it would depend on availability in your area.
