Gardenia Plants
Q.

Gardenias and black walnut tree toxicity

Zone 27370 | neason added on May 19, 2017 | Answered

I planted three frost proof gardenias about a month ago and have noticed that the leaves are yellowing with a few having dropped off. Although not under the canopy of the black walnut tree, they are within its root system. Are gardenias sensitive to the toxicity produced by these trees?

A.
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Downtoearthdigs
Certified GKH Gardening Expert
Answered on May 21, 2017

Since Gardenias are known to be finicky, the Black Walnut Trees likely have nothing to do with the yellowing leaves.
Gardenias are not on the list of plants sensitive to juglone.

https://www.gardeningknowhow.com/edible/helping-a-gardenia-bush-with-yellow-leaves.htm

Yellowing leaves are likely related to watering issues or nutrient problems.

These links will help you access the care.

https://www.gardeningknowhow.com/edible/helping-a-gardenia-bush-with-yellow-leaves.htm
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/fertilizing-gardenias-in-your-garden.htm
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-plant.htm

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