2 Tiger Eye Staghorn Sumac Wilting

Question

I’ve got 2 sumac bushes growing in large insulated containers on a roof terrace. 3 years old, zone 5 Wisconsin. All good until a month ago. The southern bush has leaves that are drying and curling…see first 2 images. The northern Bush is really wilting…see last 2 images. These are on a regular watering system. Not sure what gone wrong. Thank you

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Answer 1

This looks to be, either, overwatering or overfeeding related.

Using a fungicide will be a good idea. This article will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

I would make sure that the soil dries out, thoroughly, down to about 3 or 4 inches between receiving water. If there is any moisture down to this depth, I would hold off on watering.

Here is an article that will help you to test soil moisture:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

This article will help you to care for the shrubs:

https://www.gardeningknowhow.com/ornamental/trees/sumac/sumac-tree-info.htm

Answer 2

Thank you so much for your response and the related articles. Very much appreciated!