Paclobutrazol in Hydroponic Solution Advances Inflorescence Development of Hydrangea `Merkitt's Supreme'

in HortScience
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  • 1 Institute of Plant Sciences, Knoxfield, Department of Agriculture, P. 0. Box 174, Ferntree Gully, Victoria, Australia

Miniature flowering potted Hydrangea macrophylla Thunb. cv. Merritt's Supreme plants (multistem, 15 to 20 cm tall) were grown in a modified hydroponic system. High-quality plants were produced by pulsing plants with paclobutrazol (0.2 mg·liter-1) for 4 weeks. Flower initiation was advanced in the terminal buds of treated plants by 12 days, and this earlier flower development was maintained through to flower maturity, without loss of inflorescence diameter. Chemical name used: β -[(4-chlorophenyl) methyl] -α-(1,1-dimethylethyl)-1 H -1,2,4-triazole-1-ethanol (paclobutrazol, ICI-PP333).

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