Folia Horticulturae

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The effect of plant shading on growth and winter hardiness of Blue Holly (Ilex × meserveae S. Y. Hu.) cultivars

Ewa Chojnowska

Research Institute of Pomology and Floriculture
Waryńskiego 14, 96-100 Skierniewice, Poland
e-mail: echojnow@insad.pl

In 1997-2000 growth and winter hardiness of four cultivars (‘Blue Boy’, ‘Blue Girl’, ‘Blue Princess’, and ‘Blue Prince’) of Ilex × meserveae S. Y. Hu. was evaluated in the climatic conditions of central Poland. Plants of ‘Blue Boy’ had the lowest number of primary shoots, while plants of ‘Blue Princess’ - the highest. Plant shading significantly decreased the number of primary shoots of ‘Blue Girl’ plants. Generally, plant shading affected the length of primary shoots. In 1997 and 1998 the length of primary shoots of ‘Blue Boy’ plants did not differ significantly and unshaded plants of ‘Blue Girl’ had longer shoots than shaded plants. Generally, shaded plants of all investigated cultivars had longer primary shoots. During four years of experiment unshaded plants had more lateral shoots. However, in 2000 the differences were fewer and for ‘Blue Boy’ were not significant. Shading of plants significantly increased the length of lateral shoots, except for ‘Blue Girl’ in 1997-98 where differences were not significant. In the field conditions there was no visible plant damage caused by low temperature in winters 1997/1998, 1998/1999, and 1999/2000.

Chojnowska E., 2004. The effect of plant shading on growth and winter hardiness of Blue Holly (Ilex × meserveae S. Y. Hu.) cultivars. Folia Horticulturae 16/1: 125-132.