Abstract: A study was undertaken to investigate the effect of foliar spray of different growth retardants (Cycocel and B-nine) on growth and flowering of Erysimum marshallii. The plants were sprayed with three concentrations of growth retardants viz. 500, 1000 and 1500 mg L-1 prepared in 0.1% Tween 80. Plant height was decreased by the Cycocel application but B-nine application was not effective in decreasing the plant height. The fresh and dry mass of roots, leaves and stem was decreased by the spray application of both Cycocel and B-nine. Cycocel application did not show any effect on the flowering and number of laterals in Erysimum marshallii but B-nine applications slightly decreased the flowering yield and number of laterals. The flower diameter was slightly decreased by the spray application of both cycocel and B-nine. Reduced leaf area was the characteristic feature of plants of Erysimum marshallii sprayed with cycocel and B-nine. The present investigation has suggested that the growth retardants decreased the plant height as also fresh and dry mass of the plants but did not improve the display value of plants in Erysimum marshallii.