What Should I Prune This Fall — and What Should I Leave Alone?
Fall makes us want to clean everything up. Trees and shrubs usually benefit from a little more restraint.
Once leaves start dropping, it is tempting to treat fall as pruning season. For many trees and shrubs, however, major pruning is better saved for another time.
Fall is useful for inspection. You can see structure more clearly as leaves disappear, identify broken or dead material, and make a plan for dormant-season work.
Good reasons to prune now
- Broken branches that could fall or tear further.
- Clearly dead branches where removal can be done safely.
- Diseased material when the specific disease calls for removal and sanitation.
- Small clearance corrections where waiting creates an immediate problem.
What can usually wait
Routine structural pruning of many deciduous trees is commonly handled during dormancy, when branch structure is visible and the tree is not actively producing leaves. Late winter is often a convenient period for that work.
Heavy pruning simply to make a tree look 'clean' before winter is rarely necessary. Removing live canopy without a specific objective can reduce the tree's stored-energy production and create unnecessary wounds.
Shrubs are species-specific
Flowering shrubs cannot all be treated the same way. Some bloom on wood produced the previous year, so indiscriminate dormant pruning can remove next season's flowers. Before cutting a shrub hard, identify it and find out whether it blooms on old or new wood.
Sources & further reading
These Field Notes translate Colorado horticultural guidance into practical homeowner language. For the underlying recommendations, start with the original CSU Extension resources: