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The pressure treated wood with which I am familiar (but then I am not young) came in three flavors: creosote, firex, and a greenish copper-based something. In all three cases there were chemicals that outlasted the wood and were harmful in soil or in the human body; the firex (which was manufactured to federal standards as fire-resistant) contained quite a lot of arsenic.

We have never bothered with structural beds; we throw mulch everywhere in the garden, call it "sheet-composting;" and where we want pathways we fork the top layer of mulch from that over onto the "beds" and there you are -- a raised bed.

This year we are making new beds on a quarter acre of sod by laying out the beds with string, covering the sod in the beds with cardboard and newspapers and hiding that under eight inches of hay, straw, leaves, and compost. After a year or so the beds are ready to plant as worms eat up the grass rhizomes and cardboard and aerate the soil.

The paths remain in grass and are mowed and the clippings scattered over the beds. Clippings should not be too deep or they will slime anaerobically.

A handful of potting soil nestled into the mulch makes a perfectly good "hill" and this method seems to us to yield as much or more than the tilled gardens we used to do, with about 1/4 the effort. And not a board in sight! :)
 
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