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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.

Cutting Production and Flowering Shoots from Penstemon and Dianthus Stock Plants