Pulverize® Weed Killer kills weeds, not lawns. Works fast, see results in hours. Pulverize® Weed Killer works quickly; dying weeds will be seen within hours of application. Treated weeds, moss or algae will turn brown after treatment, however, grass will recover within a few days to weeks. May stain thatch (dead grass under lawn); this does not affect the health of the grass. Controls weeds: Bull thistle (Cirsium vulgare), Creeping buttercup (Ranunculus ripens), Dandelion (Tarazicum officinale), Moss, Speedwell spp., Persian speedwell (Veronica persica), White clover (Trifolium ripens).