Many attractive species and hybrids of Passiflora have commercial potential, grown in containers. While most Passiflora hybrids and cultivars are easily grown from cuttings, controlling the subsequent vigorous growth is a limiting factor in their commercialisation. A variety trial with more than 50 species, cultivars and hybrids of Passiflora was conducted at the University of Kentucky Arboretum in Lexington. Among the best performers based on plant habit, flower number, and quality were P. `Blue Bouquet' (P. caerulea x P. amythestina), P. `Sapphire' (P. caerulea x P. edulis) and P. x violacea (P. caerulea x P. racemosa). Significant height reduction was attained with Bonzi at 25 and 50 ppm, with greatest control at the higher concentration. At 21 days after treatment with 50 ppm, there was a 28 and 33% reduction in height for P. `Blue Bouquet' and P. `Sapphire', respectively, compared to untreated plants. Regardless of concentration, no reduction in plant height was observed with P. x violacea. Although 28% and 33% height reduction is significant, plants were still larger than would ideally be desired for greenhouse or nursery production. Perhaps multiple Bonzi treatments possibly at higher concentrations, or Bonzi coupled with cultural practices such as reduced fertilization or pruning, could be used to further reduce plant height. Bonzi treatment had no affect on the number of nodes (Passiflora flowers on new growth at each node) produced in any of the selections under trial. All plants grew out of the height control after approximately one month after Bonzi treatment. No floral buds were observed during the 21 days of examination, but all plants initiated flower buds in the month following treatment. www.ca.uky.edu