I've always wanted to grow my own food, and this summer Im actually starting! The first day after I got home from school my dad and I went to Home Depot and got some pressure treated lumber to build a couple plantar boxes for our backyard. We decided on boxes that were 6 feet long, 2 feet deep, and 1 foot high, all made out of 2x12 lumber.
This size made buying the wood nice too because we could just get two 12 foot lengths to make all four 6 foot pieces, and then one 8 foot piece to make the four 2 foot side pieces. We also got one 8 foot 2x4 to use as bracing material for the corners. All of the wood cost about 90 dollars.
Once we had the wood, we started construction!
Apparently using pressure treated lumber is NOT A GOOD IDEA for plantar boxes and gardening. The chemicals used in the pressure treating process leach into the soil, and then the plants, and then your body when you eat your veggies! Use redwood or cedar wood instead, and these woods are also naturally rot-resistant so thats a plus.
Thank you so much to all the users who posted comments voicing their concerns! One user also pointed out that people freak out about things like this, but at the same time might not think twice about drinking a diet Coke, even though it contains carcinogenic chemicals and other nasty stuff... Like everything else in life, it is up to you to weigh the risks. But, just to be safe, if you have the option, I would suggest using redwood or cedar :)
Thanks again everyone!