Controlled Flowering of Herbaceous Perennial Plants

摘要: We have determined the juvenility, cold (vernalization), photoperiod, and cultural requirements necessary to flower many herbaceous perennials on specific dates at specified sizes. identified long-day (LD) requirement by conducting critical photoperiod experiments in which is defined as that elicits a complete, rapid, uniform flowering response population. The LD for all tested can be met either continual of 16 hours or more, four light an interruption middle night. Nightinterruption lighting two adequate some species. Incandescent, cool-white fluorescent, metal halide, high-pressure sodium lamps effectively promote response; differences among irradiance levels required induction are horticulturally insignificant. To maintain vegetative growth quantitative qualitative species, photoperiods should 10 fewer.