Alex wrote:
Hi,

I would like to know if there are books on using worm castings
only, as a medium?

Alex

Probably not but you never can tell what somebody will publish a book about.

Worm castings are generally used as a feriliser and soil conditioner.
Assuming that you had enough to fill a tub or garden bed it wouldn't be such
a good idea to do it. A growing medium should be the right combination (for
the species) of the ability to hold water, air, nutrients and trace
elements, to support the root structure and to support beneficial microbes.
Straight worm castings is likely to fail several of these requirements for
most plants and even if it didn't it would be a profligate consumption of a
valuable resource. Good growing practice is about balance.

D