What is the advantages of using fish fertilizer for flowers?

Non at all, it is upsetting the marine ecosystem and your garden will smell of fish.

Fish emulsion produces bigger and better tasting vegetables, and also makes grass grow thicker and flowering plants produce more leaves and blossoms.

The fishy smell lingers but a day or so.

The product is made from by products from fish, and does little if any additional damage to the marine ecosystem.