Beginner Gardening: Any Suggestions for My Gardenia?, 1 by Keithmac

Keithmac wrote:
I am in Central Florida, the last year or so my Gardenia has had yellowing leaves, low yield of flowers, The bush is 5 years old, lots of buds coming out now but I still have the yellowing and I see what appears to be dirt or dark sand sprinkled around the inner parts of the new growth leaves.

I tried Epsom Salt treatment 3 and 6 months ago, did not see any result.

Any suggestions are welcomed.

Thanks,

Keith