Florida Horse Country help

[TZ-OH6]

Hi All,

I just moved to the Ocala FL area and it is a bit different from the Ohio farmland I'm used to so I'm asking for any growing tips Y'all might have.

My garden is pure sand but I dug 2-3 ft deep and layered in branches, pine straw, and oak leaves. I can water with high TDS well water that is a bit smelly from sulfur, but I'm more worried about low fruit set and diseases from the hot wet summer.

Winter is dry but that part of the property gets frequent early morning frost and we had a hard 25F freeze last December. Should I plant late (in the summer heat) for cool weather November harvest or early to try and beat the summer heat?

This is the race horse capital of the world so horse manure +sawdust bedding is plentiful and free in the area, but I read that it may be a big problem from residual herbicides on the feed hay. True?

If we dump manure+bedding on our sandlot pasture to get the grass to grow better, can I use grass clippings from mowing it for garden mulch?

I also have huge Rhino beetle grubs everywhere, and burrowing June bug type beetles leave little ant hill mounds every few feet. Will they be more trouble than the robin-sized grasshoppers?

Thanks