Table 4.

Cold hardiness level of arborvitae subjected to different soil water conditions

Cold hardiness level (expressed as lowest temperature ° C tolerated without severe injury)
Water Treatment ml/potExperiment 1 (1977 study)Experiment 2 (1978 study)
Date tested
10/610/2111/210/210/1611/311/1312/14
400–13–18–24–9–18–27—36z-57z
100–17–18–27–12–24–24–33–57z
50–10–18–24–9–18–24—36z–48y
100-400 Oct. 1–24–27–36z–57z
100-400 Oct. 15–24–36–57z
100-400 Nov. 1-36z-57z
50-400 Oct. 1–18–21–36z–57z
50-400 Oct. 15–18–36z–57z
50-400 Nov. 1–33— 51x
  • z — lowest temperature tested

  • y — considerable injury evident at –51 but not completely killed at-57.

  • x — considerable injury evident at –54 but not completely killed at-57.