The Reference Manual of Woody Plant Propagation
For most this is the propagator's bible. The book covers most species, and specific concentrations for rooting
hormones are specified. This is invaluable information since for many plants there is an optimal concentration and using a
higher or lower concentration reduces rooting success rates as well as root development.
Dr. Dirr has done all the research and you reap all the rewards. His conclusions are backed up by many scientific studies
by various individuals and groups. The first part gives a summary of the different propagation methods and the second part
has very detailed data on specific species.
If you are serious about creating your own bonsai material. This is a worthwhile and wise investment