I have a new gardenia plant, long stemmed about 3-4 feet high in a pot in partial shade; as flowers bloom the petals turn brown, but don't fall. I live in Los Angeles and don't know if I'm watering too much (watering 2-3 times per week), too little or if it's time to transplant the shrub. I noticed brown spots on some of the leaves with a yellow border. I recently bought Neem oil and sprayed the shrub to prevent further fungal issues. I've also created a pebble tray with water in the event the browning of the flower petals is due to lack of humidity. I haven't fertilized yet, though. Any ideas?