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Five vegetatively propagated perennial species that received 0 or 15 weeks of cold treatment were placed under seven photoperiods (10-, 12-, 13-, 14-, 16-, 24-, and 4-hour night interruption). Cuttings were harvested every 3 weeks, and their number and total fresh weight were recorded. Cutting bases were dipped in a 1200 ppm IBA solution for 5 seconds, stuck in perlite, and placed under mist for 3 weeks. Results varied by species. Stock plants of  Achillea  `Moonshine' produced the most cuttings under a 12-hour photoperiod. Noncold treated  Coreopsis verticillata  `Moonbeam' only produced cuttings under photoperiods longer than or equal to 14 hours. Cold treated `Moonbeam' produced cuttings under all photoperiods in the first flush. Eighty percent of cuttings from the first flush of  Phlox paniculata  `Eva Cullum' rooted when taken from plants growing under the 10-hour photoperiod, but only 1.2 cuttings per plant were harvested; 2.5 cuttings per plant were taken from  Phlox  grown under the 24-h photoperiod, but only 20% rooted. Only stock plants of  Sedum  `Autumn Joy' receiving a 14-hour photoperiod produced significant numbers of vegetative shoots. Cutting production and rooting of  Veronica  `Sunny Border Blue' was not affected by photoperiod.

Influence of Stock Plant Photoperiod on Cutting Production and Rooting