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What is the 10%-20%-30% Rule? When planning for and planting trees in an urban / community forest, including no more than the percentages defined below, allows for good biodiversity. • 10% for the Species of trees. For example, Red Oak, and White Oak are separate Species of trees. • 20% for the Genus of trees. For example, all Oaks are in the same Genus of trees. • 30% for the Family of trees. For example, Oaks, Beeches, and Chestnuts are in the same tree Family. Page 3 of 33