If my mower would go to 6 inches, I would mow it there. A few years ago I experimented with leaving my St Aug lawn going unmowed...forever. The grass will grow to 32 inches tall and then stop growing. It looked amazing to me. It looked less amazing to my neighbors. I lived in a more deserty part of Texas at the time. I had stopped watering and fertilizing completely and the grass looks great (pic below). But anyway, 5 inches is not too tall for St Augustine.

That grass had not been watered for month. The dog was a chow chow about 32 inches tall. The grass had not stopped growing at that point. Here's a pic of her walking through the grass. You can see the top of her tail and ears.

That`s excellent. It will look neat"er" in my opinion if its higher. Any idea on the Toro brand?

I have a battery powered EGO mower. You're probably not interested. You might post your question in the lawn mower forum. They are fairly active.

Thanks