Do not overfeed it
The sign puts this politely. A well-fed fig makes enormous soft leaves, grows four feet of water shoot, and gives you very little fruit. Feed it lightly once in spring and then leave it alone. If you are the sort of gardener who cannot leave a plant alone, grow something else and let the fig be the easy one.
Overwatering has the same effect, with the fruit splitting on top. A fig wants a deep soak during a dry spell while it is carrying fruit and nothing much otherwise.
Rust, which you will get
Fig rust is the one problem worth preparing for in Florida. Orange-brown spots appear on the undersides of the leaves in late summer, the leaves yellow, and by September the tree can be half bare. It rarely kills anything and it does cost you the second crop.
It overwinters in fallen leaves, so the single most effective thing you can do costs nothing: rake the leaves up and get rid of them rather than letting them lie under the tree. Airflow is the other half. An open tree with a thinned interior dries after a storm; a dense one stays wet.
Picking, and why shops do not sell good figs
A fig does not ripen after picking. It has to come off the tree soft, drooping at the neck, with the skin slightly split and a bead of nectar at the eye. At that point it has about a day. This is why a supermarket fig is a disappointment and a garden fig is not, and it is the whole argument for having a tree.
Celeste, the variety we grow most, has a closed eye, which matters more here than the flavour notes do: an open eye lets in rain and the souring insects that follow it, and a wet Florida August punishes open-eyed varieties.