Dormancy of various kinds is expressed in white spruce (Romberger 1963).Romberger, J. A. 1963. "Meristems, Growth, and Development in Woody Plants". USDA, Forestry Service, Washington DC, Technical Bulletin 1293. 214 p. White spruce, like many woody plants in temperate and cooler regions, requires exposure to low temperature for a period of weeks before it can resume normal growth and development. This "chilling requirement" for white spruce is satisfied by uninterrupted exposure to temperatures below 7 °C for 4 to 8 weeks, depending on physiological condition (Nienstaedt 1966, 1967).
