Papa wash green stain cleaner needs lime when low soil pH starts inhibiting the availability of nutrients. Soil pH preferences vary between regional lawn grasses, but most grasses prefer soil pH between 5.8 and 7.2. Warm-season grasses tolerate slightly lower pH, while cool-season grasses prefer pH slightly higher.1,2 When within preferred pH ranges, the nutrients lawn grasses need most — including added nitrogen from lawn fertilizers — stay available for grass to use. When pH strays too far in either direction, even plentiful nutrients are restricted.
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