Also, check the PH. St Augustine likes it around 6.5. I tested and it was well over 7. Dropped a bunch of granular sulfur down and that did the trick. Also, Telstar for bugs and Milorganite for an iron boost. Just got done dropping a high nitrogen fertilizer down while it was still cool and mild. Don't do it when it gets hot or you will be fighting fungus. After that, I only put down a 16-4-8 slow release fertilizer every 2-3 months. Lastly, I replaced all the rotator sprinkler nozzles with spray nozzles. What a huge difference that made. Much greater coverage and I only need to run each zone about 10-15 min. Lawn is in the best conditions its ever been in. Enjoy!!
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