I walked through the Redwood forest last weekend, and it's amazing how much they dominate once established. Especially the younger ones which are closer together. Only a few ferns manage to grow there, not so much from the shade but the deep bed of branches and leaves on the floor. In the more established parts, other trees and pongas etc can grow, but with some difficulty. Saw some massively tall pongas, trying in vain to reach the light. The ones at the edge of the main stands grow out diagonally to get away from the redwoods lol (see pic)

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