Recently I was helping to make a large planter box for the kids at school to grow veggies, and they bought hardware cloth for the bottom. After putting it together, I looked at the sheet that came with the cloth and it stated, "CONTAINS LEAD". It was then decided to use it for flowers not veggies.

I am planning on making my own planter box, like this one (only simpler):

http://www.cleanairgardening.com/reccedraisco.html

using redwood planks, and I was wondering if there is anything I need to be careful about in terms of what kind of screws and brackets to use to connect it. Can I use anything? Also, can I use any kind of redwood at Home Depot? They seem to have a lot of different kinds.

I added a new irrigation valve nearby for drip watering, so I won't need a self-contained watering container. This is going to be only for herbs. Thanks for any info on this.