There is no such thng as lunar "soil". Technically, the powder on the
surface of the boon and the broken rocks eneath are called "regolith"
which is a soil-like material without any biological content.
The same goes for Mars and the asteroids; there is no "soil", only regolith.

Matthew Ota

Bill Carson wrote:

I been pondering what the grey moon soil is really like and whether
you can simply "just add water" to make it suitable for plants!
Seriously, does the soil on the moon need to have organic nutrients to
support plants or can you turn lunar soil into growing soil just by
adding water?

You could argue the same for soil on Mars and the asteroids.

BC