The Rule of Threes: Planting in Triads for Garden Impact

The Rule of Threes: Planting in Triads for Garden Impact

Three is a magic number in design—triads in music, three-act plays, triptychs in art, the "rule of threes" in comedy. In planting, odd numbers create dynamic, natural-looking groupings; even numbers (pairs) suit formal effects.

Why Three Works

If three of one plant lacks punch, plant five or seven. Masses of a single plant catch the eye; scattered "onesies and twosies" look jumbled. For serious ground coverage or bold impact, mass dozens of the same plant (e.g., Lily-of-the-Valley)—the eye reads the sweep, not the count.

Repeat for Rhythm

When reprising an element—color, shape, or specific plant—repeat it at least three times. A series of three Hydrangeas as a border backdrop creates rhythm. When in doubt, count to three.