Answer: As you've discovered, Dave, growing turfgrass beneath redwood trees is not usually successful. The grass has to deal with shade and acidic soil, but more importantly, the ground will be quite dry, regardless of your watering routine. The roots of redwood trees compete for moisture and nutrients and by their shear volume, will usually out-compete the fibrous roots of turfgrass. Rather than trying to rejuvenate the lawn, why not grow a groundcover beneath your redwood trees? Two that take foot traffic and dry shade include Vinca minor and Wintercreeper (Euonymus fortunei). You might also consider Bishop's Weed (Aegopodium), Heartleaf Bergenia, Lamium (dead nettle) or Redwood Sorrel for the site. Hope these suggestions are helpful!
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