Calculating Square Footage

Rectangular areas - multiply length times width

Triangular areas - multiply 1/2 the base times the height

Circular areas - mulitply 3.14 times the radius squared

To find out how many plants to buy, multiply the square footage by the "plants-per-square-foot factor" that corresponds to the plant's spacing:

For example, a five-square-foot bed of a plant that's spaced six inches apart would require 20 plants.