Does anyone know anything about gardening?

Thanks for the info. So pressure treating/any other sealing/staining is not good for veg etc? The current ones are literally falling apart so I was hoping to replace them with something more weather/water resistant.

There is debate about this. I've seen forums where people argue about it all day. Brakeless, helmets, etc... Since I'm growing veggies for my family to much on I just choose to avoid the debate and get untreated wood. Cedar is notorious for its weather resistance, so this is what I use.