Answer: Many plants can't tolerate the deep shade under a redwood or can't compete with the tree's aggressive, shallow roots. Others dislike the acid soil that results from the thick mulch of redwood needles. In their native habitat, redwoods share their space with rhododendrons, azaleas, California Lilac, Dicentra (bleeding heart), Eriodictyon californicum Yerba Santa, and Spiraea douglasii (Western Spiraea) but you can choose any shade loving shrub that you especially enjoy. Best wishes with your landscape.
Q&A Library Searching Tips