Ten Year Old Laburnum Has Rarely And Sparsely Flowered. Very Healthy Until (every Year) Mid Summer When Leaves Turn Dry, Brown They

Question

fall Have tried feeding then not feeding according to advice from various sources.

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Answer 1

This has a severe fungal infection. Actually, it looks like multiple infections.

It is likely that the plant was overwatered at some point, contracted an infection, and the infection didn't get treated. This can lead to multiple infections over time.

Make sure to treat that with a fungicide, and test the soil to rule out deficiencies or pH swings.

Here are some articles that will help:

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

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

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

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

https://www.gardeningknowhow.com/ornamental/trees/goldenchain/growing-goldenchain-trees.htm