Controlling Aspen Suckers in the Landscape

Managing Aspen Root Suckers Without Harming the Parent Trees

Aspens (Populus tremuloides) spread aggressively via root suckers. Because suckers are connected to the parent’s root system, herbicides like glyphosate can damage or kill the main trees.

Safe, Effective Control

• Regular mowing: Cut suckers at ground level with a lawn mower or string trimmer as they appear. This depletes root reserves over time.
• Physical barriers: Install a deep (24–30 inch) root barrier (HDPE or metal) around the planting area to limit lateral spread.
• Hand removal: For small areas, dig out suckers with a sharp spade, taking as much root as possible.
• Mulch and groundcovers: Dense planting of competitive groundcovers can suppress sucker emergence.

What to Avoid

• Do not apply systemic herbicides to suckers if you want to keep the parent trees.
• Avoid deep cultivation that stimulates more suckering.

Persistent mowing is the most practical, low‑risk method for keeping aspen suckers in check.