heat requirement

Chilling and Heat Unit Levels Affect Foliar Budbreak of Selected Red and Freeman Maple Cultivars
Barrett C. Wilson, Jeff L. Sibley, James E. Altland, Eric H. Simonne and D. Joseph Eakes
- Arboriculture & Urban Forestry (AUF) May 2002, 28 (3) 148-152;
- DOI: https://doi.org/10.48044/jauf.2002.022