No. The bottoms of the round and the square 1-gallon containers as well as the 3-gallon containers are designed to be placed on ground cover cloth or plastic. Air-root-pruning is accomplished by air circulation around the containers at both sidewalls and drain holes at the sides of the bottoms. The only situation I have observed where air-root-pruning on the sides was marginal was where the square 1-gallon containers were placed snugly together and were more than 6 containers wide. Some roots in the center of the blocks had roots extending ½ outside the openings. If you use the square 1-gallon containers in blocks greater than 5 or 6 wide, leave a small amount of space between containers for air circulation.
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