non-toxic way to preserve wooden trellis posts
I'm looking for a simple, non-toxic way to extend the life of my trellis posts. I'm just using cheap 2x3's, and want them to last more than one season. I've read that coating a fence post with linseed oil mixed with powdered charcoal will help prevent the post from rotting. Does anyone know if this really works? I'm thinking about getting some linseed/flax oil (not boiled, since that probably contains chemicals), adding some pulverized charcoal, then painting it on the bottom ends of my trellis posts. Or I might just use vegetable oil, if I can't find the right linseed oil. I'm also going to cut the tops of the posts at an angle, so water will run off. These posts don't need to last for decades. I'm just hoping they'll be good for at least 2 or 3 seasons. And they'll be stored in the garage over the winter.