How to Propagate aspen?
Propagate from hardwood cuttings in winter or suckers in autumn or late winter

aspen · Populus tremula
Also known as: aps; asp; haps tree; quaking aspen; trembling tree
Grow in moist but well-drained, humus-rich, fertile soils but avoid planting in vicinity of buildings due to vigorous root system; it has the potential to become a nuisance. Very useful as a screen or as part of a shelter belt and grows very rapidly
Propagate from hardwood cuttings in winter or suckers in autumn or late winter