Gardenia Plants
Q.

Gardenia Leaf Disease

Anonymous added on April 12, 2011 | Answered

My gardenia is a houseplant in the winter. It has some sort of leaf disease, which doesn't seem to fit the descriptions I have seen. Some of the leaves (old and young) begin by turning yellow up the middle and gradually turning all yellow before drying up and falling off. They also have a coupleĀ of spots, about 1/4 inch and green with a solid black center.

A.
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Nikki
Certified GKH Gardening Expert
Answered on April 12, 2011

The yellowing sounds like it may be an iron deficiency. This article will help with that: https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm

The spots sound like an unrelated fungal issue. It probably started because the plant was weakened by the nutrient issue, but needs to be treated separately. I would recommend using neem oil. It will treat the fungus with the added bonus of keeping pests away, which gardenias indoors are also prone to. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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