The builder next door filled in a large trench adjacent to the property line by blowing in aggregate. Now there is a grey-ish dust all over my garden! I am worried that if it rains, it will turn into concrete. What should I do?
If it was just aggregate that was put in the trench, then what you are seeing is gravel dust, which will not turn into concrete. However, if your plants are very thickly coated with the dust, it will be difficult for them to “breathe”, so I would recommend you gently hose the material off if that is the case.