Cooler Nights and shorter hours of sunlight this time of year sure put St Augustine in a Semi Dormant state. Recovery can be real slow. Ground temperature because of Cooler nights is a big factor.
Try Milorganite, and apply it heavy. It helps hold moisture as well as a slow stead feed for about 6 weeks. You can't apply too much unless you dump on and cover the turf.
You can lead a Donkey to water but you can't make the Jackass Drink
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