My Gardenia’s Leaves Are Turning Yellow
Why are the leaves on my gardenia turning yellow? Some are green with spots of yellow. It is a rescued gardenia bush that I planted in a big plastic planter. It shows a lot of new leaves, but they soon turn yellow as well.
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This article should help you with that: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/helping-a-gardenia-bush-with-yellow-leaves.htm