My Sonic Bloom Weigela Turned Green And Started To Bloom.

Question

Then the leaves turned yellow, got brown spots and now the entire bush looks dead. I sprayed for insects but didn’t help. My question is should I cut it back and try for next year or is it too late?

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Answer 1

This can happen for a few reasons. Waterlogged roots, or disease caused by them. Fungal blights can cause these symptoms, too. Some can be controlled with fungicides and some cannot. Another cause that is common is root nematodes. They can destroy a plant pretty quickly. There aren't really any good cures for that one.

I would not plant in the area for a few years. This will get rid of most of the problems that it could be. Solarizing your soil wouldn't be a bad idea, either.

https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm

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

https://www.gardeningknowhow.com/plant-problems/disease/root-rot-in-garden-plants.htm