Try lining the wood (on the soil side, of course) with thick black plastic.
You should be able to staple-gun it in place.

"Thomas J. Girsch" wrote in message
...
Hi all.

I'm building a vegetable garden with raised wooden planters.
Unfortunately, cedar and redwood weren't available, and of course treated
wood is Bad Very Bad, so I've got untreated pine. I'm wondering what I
can
do that will protect the pine from rot, without leaching into the soil and
hurting the food.

Thanks!