How to Fertilize Japanese aspen?
Balanced perennial feed every four weeks from spring through summer

Japanese aspen · Populus sieboldii
Cultivated for their very rapid growth as specimen trees and useful for windbreaks. Tolerant of any soil other than constantly waterlogged soils. Avoid growing within 40m of buildings as the vigorous root systems may damage drains and foundations, particularly on clay soils. It has the potential to become a nuisance. For more advice see tree cultivation
Balanced perennial feed every four weeks from spring through summer