If the plants are to be in the RootBuilder® container a matter of 2 or 4 months and are not particularly tall or have a large head, it may work best to use 6 mil poly. This stops all roots from leaving the confines of the container and all are air-root-pruned on the container sides. If you will cut squares of 2.5 to 3 ounce weed barrier type fabric and place inside the RootBuilder® container after it has been placed on the plastic, the roots will grow into the thin fabric and secure the bottom more rapidly. If plants are to be grown in the RootBuilder® for considerable time or if they are particularly tall or have a large head, it is best to use squares of the RootBuilder® Base material. This material is a knit fabric similar to that used in the Knit Fabric containers, but has been coated with vinyl to make it especially tough and long lasting. Simply place the material on the ground cover cloth or on bare soil and set the RootBuilder® container in place, and fill with potting mix to surround the root ball of a tree previously grown in a Knit Fabric container or harvested with a tree spade. Roots will grow through the RootBuilder® Base and anchor the plant against all but severe winds. At the time of sale, rock the tree back and forth (most species) or tilt and cut roots with a sharp flat bladed shovel (elms and members of the legume family).
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