Abstract
The effects of container type (round vs. square), solar exposure (100% vs. 50%) and hardening-off time (0, 3 or 6 weeks) on winter damage to Ilex crenata Thumb. ‘Hetzii’ (Hetz Japanese holly) and Buxus sempervirens L. (common boxwood) were studied. Container type and hardening-off time had significant effects on plant viability of Ilex crenata ‘Hetzii’ after exposure to freezing temperatures. Plants in square containers achieved substantially higher viability ratings than plants in round containers after freezing. Buxus sempervirens was significantly affected by hardening-off time only. Plant viability increased greatly with 3 or 6 weeks of hardening-off as compared to no hardening-off. Common boxwood plants in square containers did not achieve the same level of growth as plants in round containers during the 1980 growing-season (before freezing). Optimum growth for Buxus sempervirens occurred under full solar exposure.
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