A plant growth bag has a substantially square cross section and is made from needle-punched, spunbond, non-woven polypropylene. A plant grows in growth media contained by the bag. In one aspect, the bag is placed into a basin that holds water that drains from the bag. Roots grow through the bag. In another aspect, the bag is placed in a second, larger bag also containing growth media, and the roots grow through the second bag and into water accumulated in the basin.
