POPULUS Tremuloides Height: 20-30' Spread: 20-30' Shape: Pyramidal Foliage: Green Fall Color: Yellow/Red Hardiness: -50 F Dark green leaves with excellent yellow and sometimes red or orange fall color. Leaves flutter in the slightest breeze, giving it the name of "Quaking" Aspen. Smooth white bark on a pyramidal and narrow tree when young, with a rounded crown of maturity. Fast Growing