Frost Proof Gardenias

New Orleans, LA

My Frost Proof Gardenias are turning brown from the stem near the base of the leaf and the entire leaf is yellowing toward the tip then falling off. It doesn't appear to be Iron Chlorosis, which has been confirmed by my landscaper. Anyone have any ideas what it could be? Wish I had a picture to share. Will work on that.

Dublin, CA(Zone 9a)

Could be a watering issue (either too much or too little) but there are lots of other possibilities too, a picture would really help.

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