Eight bedding plant species were grown from plugs obtained from two sources
. The plugs were transplanted into jumbo sis packs and sprayed with a solut
ion of chlormequat/daminozide with concentrations of 1000/800, 1250/1250, o
r 1500/5000 mg.L-1 when new growth was approximate to5 cm in height or widt
h. Three different species were grown in the fall (Dianthus chinensis L.,'T
elstar Mix', Petunia xhyhrida Hort. Vilm.-Andr., 'Dreams Red', and Viola xw
ittrockiana Gams,,'Bingo Blue'), winter [Antirrhinum majus L., 'Tahiti Mix'
, Matthiola incana (L.) R. Br., 'Midget Red', and P. xhybrida, 'Dreams Mix'
], and spring [Catharanthus roseus (L.) G. Don, 'Cooler Pink', Salvia splen
dens P. Sellow es Roem. & Schult., 'Empire Red', and Begonia xsemperflorens
-cultorum Hort., 'Cocktail Mix']. The treatments significantly reduced fini
shed plant size of all species for each season. There was a significant dif
ference in finish size between sources for Dianthus, Antirrhinum, Matthiola
, Catharanthus, Salvia, and Begonia. The efficacy of chlormequat/daminozide
also differed for each source of Dianthus, Matthiola, and Begonia, but the
treatments minimized the differences in finish size between sources for Pe
tunia and Viola. Chemical names used: (2-chlorethyl) trimethylammonium chlo
ride (chlormequat); (N-dimethylaminosuccinamic acid) (daminozide).