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Q.Just under the soil there’s a white chalky looking substance. What is it, please?

Zone SE26 London | meverrier@btinternet.com added on February 22, 2019 | Answered

On closer inspection it looks like threads of white compacted together.

A.Answers to this queston: Add Answer
Answered on February 23, 2019

I suspect it is fungal mycelium growing on a layer of organic matter.

But there is a chance it is a natural high calcium chalky substance, or layer of spilled or dumped cement spoils or paint from a building project.

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