Abstract
Foliar applications of the cytokinin, 6-benzylaminopurine (BAP) to Boronia heterophylla F. Muell. resulted in profuse lateral shoot development. Subsequently, if plants were over-wintered in a polyhouse, these short BAP-induced laterals developed flowers in spring. The resultant plants were compact, highly branched and produced an attractive display of flowers. The most suitable BAP concentration was 50 mg l −1 applied over 4 applications. More frequent application substantially reduced flowering. Manual pinching of the leading shoots was an unsatisfactory treatment for increasing branching and led to a reduction in flower numbers. Transferring plants between a polyhouse and an environmentally-controlled glasshouse indicated that a prolonged period of cold is needed for adequate flower development in B. heterophylla. Whether this reflected a specific cold-requirement for the flower buds or competition from active vegetative growth could not be determined.
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