Abstract

A study conducted from 1997 to 2000 determined the effects of thidiazuron (TDZ) on shoot formation, whole plant size, and phytotoxicity in Nandina domestica Thunb. ‘Harbour Dwarf’ and ‘Compacta’ (2000 only). Single foliar applications of up to 4000 ppm TDZ increased shoot formation in both cultivars, with minimal effect on plant size or appearance. Single substrate drenches of up to 2500 ppm TDZ increased shoot formation in ‘Harbour Dwarf’ nandina but were severely phytotoxic, often resulting in foliar distortion and necrosis, or plant death.