Blythe et al 2007. Methods of auxin application in cutting propagation: a review of 70 years of scientific discovery and commercial practice
Excellent review of everything you'll need to know about how to use rooting hormones and why they work. EK Blythe, JL Sibley, KM Tilt, and JM Ruter. J. Environ. Hort. 25(3):166–185 (2007).
Blythe Rooting hormone review JEH 25-3-166-185.pdf
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