Bottom line: Growing plants for sale means annual FDACS nursery registration and an inspection — but cut flowers and foliage not intended for propagation are specifically exempt, so a bouquet stand is a much simpler business than a plant nursery.
The Path
Anyone growing plants for sale needs annual FDACS nursery registration, priced between $35 and $460 depending on inventory or acreage, plus a yearly pest/disease inspection. Buying plants wholesale to resell rather than growing them yourself requires Nursery Stock Dealer registration instead, at $25–$69 per location. Florida explicitly exempts seeds, cut flowers, cut ferns, cut foliage not intended for propagation, and non-certified lawn/pasture grass from nursery registration — so a cut-flower bouquet business generally doesn't need to register at all, a meaningfully lighter path than potted plant sales.
What You Need
Growing to sell: annual FDACS Nursery registration ($35–$460) plus inspection