What is the rule of 3 in Landscaping?

The rule of 3 is utilizing odd numbers of plants, trees, or other landscape design features to achieve a softer balance and symmetry in a landscape design.

The odd number of features creates a more natural and visually appealing design. This applies to plants in your garden, trees around your yard, and other landscape design features.

Sources for more information:

• https://www.reddit.com/r/gardening/comments/135y42l/can_someone_explain_the_rule_of_three_to_me_just/
• https://abladeofgrass.com/blog/what-is-the-rule-of-3-in-landscaping/
• https://www.hgtv.com/gardening/garden-design/what-is-the-rule-of-three-in-gardening