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Planting area guidelines: Street or highway medians

Highway median width: Maximum tree size at maturity1
8-12 feet Small (less than 30 feet tall)
12-25 feet Medium (less than 50 feet tall)
> 25 feet Large (taller than 50 feet)2
1 Refer to Tree Selection for information on small, medium, and large maturing trees.
2 In compacted or poorly drained soil, increase recommended distances and planting area size to compensate for aggressive surface root formation.

NOTE: These guidelines work only for 3 foot soil depth. If there is less than 3 feet of soil, plant small maturing trees.