Dan,
The intent of the EarthTainer was never intended as a cheap knock-off of the EarthBox - there are plenty of these designs floating around the Internet. This design will last many years - and considering the labor you invest in it's construction, the extra cost of durable materials is worth it to many folks.
Instead, the goal was to give "Urban Farmers" a vessel to grow gardens on a balcony, decks, etc where in-ground planting was not an option.
Fishinnut - follow the planting guide section of the Construction Manual.
Raybo
