White powdery substance 2” to 10” deep in my soil.
In one of my wood planters I found this white powdery substance about two inches under the hemlock mulch. It can be found down to about 10” deep and settles in a thick layer in very, very dry soil. I have not seen this anywhere else in my garden (and I have a lot of garden space). It doesn’t look mycelium. It seems to like to collect around the roots of plants but it is scattered through-out the garden bed, roots or not.
Multnomah County Oregon soil