The soil in my crawl space is a light gray/brown, fine silt.

The soil in my back yard is black and clay-like. Most plants do not do well in it. Years ago, when a contractor covered my lawn with the black, clay-like soil, nothing grew there for a year - not even weeds. (the weeds came back the following year.)

When they dug the trench for the new sewer line a few months ago, the soil five feet down matched what is in my crawl space.

So, we'll see if native plants can grow in the crawl space soil. They still have to contend with me as their caretaker.