Dr Whitcomb has patents on containers that stop root circling and stimulate root branching.

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I use the seed starter trays to get my plants off to a healthy beginning.

 You can see how the slanting walls and holes (which cause air pruning) cause the roots to divide and grow downward creating the massive healthy root system.

You can see how the slanting walls and holes (which cause air pruning) cause the roots to divide and grow downward creating the massive healthy root system.