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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.
I don't know how deep St Augustine grass roots will go, but I'd be willing to bet that they'll grow deeper than 4 inches if given the chance. What you need to do is water deeply (make sure the water penetrates to a depth of 6 inches or so now and get it deeper as the grass develops better roots).'ve heard people say that KBG roots will only go down 3-4 inches so it needs to be watered every day. But I've dug down several feet and found grass roots (before planting the native grasses) so I know that KBG can be trained to have shallow roots or deep roots. I would imagine that St Augustine can do the same.