On Jan 8, 4:19 am, "Janice" wrote:
I am going to make some raised beds in my garden to grow vegetables as the
present soil is heavy clay. I already had a small raised bed made from 2ft
by 6in edging slabs and the difference in yeild was startling. I imagine
lengths 8in by 2in timber would be ok so what would be the best and
prefeably cheap timber to use? And what should it be treated with?

I'd avoid treated timber unless you think the copper, chromium, and
arsenic oxides will improve your lettuces and your health!
I'm using plastic bins. Concrete or bricks or untreated hardwood
railway sleepers could be considered.