Lining a raised bed?
Following on from my new raised bed query yesterday, I've just read the instructions that came with the kit, and they state "As the material is pressure treated, if using to grow plants for human consumption it is recommended you line the frame with polythene."
I would have thought that this was a bad idea - trapping damp between the polythene and the timber.
Is the pressure-treatment really hazardous? And if it is, my compost bins are made of pressure treated wood - are they going to contaminate my compost making it unfit for use on the veg patch?
What do other people do?