Cornus florida Flowering Dogwood Size: Variable with location, in some areas 20' in height represents a magnificent species, however, the tree can reach 30 to 40' in height with a spread equal to or greater than the height. Hardiness: Zone 5. Habit: Low-branched tree with horizontally spreading lines, layered effect, usually with a flat-topped crown. Excellent plant for winter habit. Rate: Slow to medium. Culture: Sun, partial shade.