Reviving dead groundcover

What's the best way of doing this? Phosphorous for the roots? Or go for the jugular of Nitrogen. Autosprinkler is watering it but nothing happening. Or is it (probably) a fix specific to this situation.
mercenary gardener z11
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Mike wrote:

There is no CPR for a dead groundcover.
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Travis in Shoreline (just North of Seattle) Washington
USDA Zone 8
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