I want to build off the ground planters (not raised planters) but a 3 ft x 3ft or so 12-18 "deep planter where the soil level will be at a 3 ft height and the planter is on legs. These are for veggies only and I'm in zone 9B in Florida. I could easily use 4 x 4 legs and 2 x 12 lumber, but I feel that will be tough to get home from my local Lowes, very heavy and overkill. I found a product used for home building called Hardiesoffet, it's a concrete product, 1/4" thick, waterproof, bug proof, fireproof and rot proof...has anyone tried such a product for a planter. It does have some silica and other chemicals but I cannot find out if they will leach our or if they will be safe for planters. I thought a 2x4 frame covered in this product would be ideal.
If not, can I use 3/4 inch lumber for the sides of such a planter or must it be 1 1/2 as in a 2 by. I plan to use 2 by planks for a sturdy bottom.
I found such planters online, made of cedar that snap together, which received some good reviews, but cost almost $200 each. Since I am a bit handy I want to build them myself and save some money.
Any recommendations anyone can give would be helpful.