Abstract
To examine the effect that media have on cooling rates and subsequent plant regrowth, bare-rooted Kentville Select Clone 28 (KSC28) apple (Malus domestica Borkh.) roots were placed in various media (water, sawdust, soilless mixture and plastic bag) and set in a controlled environment chamber preset to −12 °C. Cooling rates differed between media with water and the plastic bag requiring the most and the least time to reach −12 °C, respectively. Shoot and root regrowth were similar for all treatments except water, which was significantly reduced. The plastic bag treatment provided the most uniform temperature gradients throughout the root system and the fastest cooling rate, was the easiest to handle, and allowed good regrowth. Key words: KSC28 apple rootstock, sawdust, soilless mix, cold hardiness testing
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