How long can you water before you get runoff? If you can't go for a full hour, then you need to work on extending it. To do that, water to the point of runoff and wait for the dry symptoms to reappear. Then water to runoff again and repeat until you have stretched out your watering frequency to 10 days or longer. Or you might try setting a black soaker hose on the area. Only turn it on to a tiny trickle and leave it running for a month.
How tall are you mowing the grass? It should be on the highest setting you can get. If you have a riding mower, some of them go to 6 inches. Go for it! Then never mow lower again - EVER! There's no good reason to mow St Augustine any lower than the highest setting.
How often have you used organic fertilizer on it? It should get a dose of organic fertilizer at least once a year. Compost is good but without the organic fertilizer, you're spinning your wheels.
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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