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With more maintenance, St. Augustine can provide a very desirable lawn with a thick, dark green, lush turf capable of crowding out weeds. The mowing height for St. Augustine is 2.5 to 4 inches. Shady lawns should be mowed at 3â to 4â. Generally, the lower you mow it, the more frequently you will have to mow, but the result will be a higher quality turf. St. Augustine grass should NOT be scalped in the spring like other warm season grasses.
St. Augustine grass is invading my tall fescue lawn. Will Roundup kill the St. Augustine grass or is there some selective herbicide which will kill the St. Augustine without killing the tall fescue? Before you use an herbicide you should make sure that the grass invading your lawn is actually St. Augustine. The grass could be kikuyu grass which has a similar appearance. Both types of grass have thick runners about 1/4 inch diameter which spread on top of the soil.