Abstract
Stock plants of two perennial species (Penstemon and Dianthus) were grown in either a warm (16C NT) or cool (10C NT) greenhouse under either natural-day (ND) or long-day (LD) continuous-lighting treatments. Black plastic curtains were placed between the treatments from 1600 to 0800 hr. Starting Apr. 1994 through Jan.1995, the number of cuttings produced and the number of flowering shoots per plant were recorded at ≈3-week intervals. Preliminary analysis shows significantly more cuttings were produced by Dianthus in a warm vs. a cool greenhouse under both ND and LD photoperiods. Penstemon showed only a slight trend toward more cuttings produced in a warm greenhouse. Conversely, Dianthus produced fewer flowering stems in ND as compared with LD conditions in the warm house, due mainly to a greater proportion of stems remaining vegetative in the ND photoperiod. No significant differences in number of flowering stems of Penstemon occurred between any of the treatment combinations.
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