Our calculations are correct because we take into account the proper way to space plants **PLUS** we consider the appropriate distance from the edge of a bed to install plants. Please refer to the “correct” and “incorrect” diagrams below.

Spacing: 12 inches

Number of Trees: 1

68

plants

plants

100

plants

plants

distance off edge.

121

plants

plants

99

plants

plants

distance off edge.

115

plants

plants

At 12" spacing, each 100 square foot square has 36 square feet of "edge", or unplantable space. Four individual beds with 36 square feet unplantable space each, equals a total of **144 square feet that is unplantable**.

At 12" spacing, a 400 square foot square has **76 square feet of "edge", or unplantable space**.

**If beds are not entered individually, the proper area of unplantable space is underestimated, therefore; the plant quantity is overestimated.
In the above example, combining beds results in only 76 square feet of unplantable space, instead of the actual unplantable space of 144 square feet. **