Answer: It's difficult to find plants that will grow successfully under redwoods, especially one that you can walk on with frequency. Most groundcovers struggle beneath redwoods because of the dense shade, the acidity, and the dry conditions (redwoods have lots of surface roots which tend to soak up moisture). I can suggest only a few plants: wood sorrel (oxalis), pachysandra, lamium, wild ginger and vinca minor. Both vinca and pachysandra will grow 1-2 feet high, which makes walking through them difficult; lamium and oxalis will tolerate some foot traffic, but not much. Wish I had more suggestions!
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