Decreasing light intensities by 0, 35, 55 and 80% light exclusion increased Easter lily (Lilium longiflorum Thunb. ’Ace’) height and reduced stem caliper and chlorophyll content but did not affect days to flower or flower number. Increasing concentrations of ancymidol [α-cyclopropyl-α-(ρ-methoxyphenyl)-5-pyrimidine-methanol] applied as a postemergence drench at 0, 0.25, 0.50, and 1.0 mg a.i. (active ingredient) per plant sequentially reduced height under all light intensities, but 1.0 mg increased days to flower. Using ancymidol to control height, commercial-quality lilies can be forced under suboptimal light conditions.Key words: Easter lily, ancymidol, light intensity, growth, flowering