"Blackleaf" typically affects grapes, not citrus or gardenia. Black sooty mold—a fungal growth on insect honeydew—is common on these plants. It appears as a black, powdery coating on leaves.
Since your plants are outdoors in Florida, a local extension service or nursery is better equipped to diagnose and treat landscape issues. Indoor plant specialists focus on houseplant conditions.
Email photos for a preliminary opinion, but consult a Florida-based horticulturist for definitive treatment of outdoor citrus and gardenia problems.
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