yellowing gardenia

yellowing gardenia

why would my gardenia be turning yellow? I trimmed it a few weeks ago and the new growth is fine but the tops of the old stuff is yellowing. It has full sun most of the day except the first few hours in the morning. I remember feeding it azalea food last fall because I was told that the food was acid which is what gardenias like.
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I picked my one and only Galdiola!!

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