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Effects of fall fertilization programs on cold hardiness of young  Cornus alba  `Argenteo-marginata' and  Weigela florida  `Rumba' plants were examined. At the end of Summer 1992, four fertilization programs were applied to 1-year-old woody plants that were propagated in 1991 by cuttings. Fertilization treatments were as follows: 1) discontinuation of liquid fertilizer treatments on 30 Aug., 2) decreasing N concentration (100 to 0 mg·liter -1  of 20N–20P–20K) from 15 Aug. to 30 Sept., 3) constant N concentration (100 mg·liter -1  of 20N–20P–20K) from 15 Aug. to 30 Sept., and 4) high K concentration (110 mg·liter -1  of 7N–11P–27K) from 15 Aug. to 30 Sept. Whole plants were then removed from pots and roots were cleaned. Plants were then placed under freezing temperatures from 0 to –20C at 2C intervals, with plant samplings done three times during fall—at the end of September, October, and November. After the freezing test, plants were stored at –2C and repotted in May 1993 for winter injury evaluation. Preliminary results indicated that the four fertilization programs did not induce a significant effect on cold hardiness of the two species. However, it was clear that the degree of cold hardiness was different for each species:  Weigela  was ≈10 degrees less hardy compared to  Cornus  in September and October. In November, species demonstrated hardiness at temperatures less than –20C.  Cornus  also showed cold hardiness at less than –20C in October.

COLD HARDINESS OF CORNUS ALBA `ARGENTEO-MARGINATA' AND WEIGELA FLORIDA `RUMBA' UNDER DIFFERENT FALL FERTILIZER TREATMENTS