https://returntonow.net/2020/0....1/02/planting-trees-

Planting Trees in Square Holes Makes Them Grow Faster and Stronger
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Planting Trees in Square Holes Makes Them Grow Faster and Stronger

Square holes encourage roots to spiral out into native soil, planting trials show It may seem counter intuitive, but round holes are not the best shape for planting trees. According to botanist James Wong, square holes encourage roots to “flare out”