Taming Lily of the Valley: Controlling an Aggressive Spreader

Why It's So Persistent

Lily of the valley (Convallaria majalis) spreads via underground rhizomes, forming dense colonies that readily invade lawns and garden beds. Even small root fragments left behind can regenerate.

Control Methods

Digging (Preferred for Small Areas)

• Remove entire clumps, including all rhizomes.
• Expect regrowth—monitor and repeat as needed.
• Empty spots will fill in quickly from surrounding plants.

Spot-Treatment with Herbicide

• Apply glyphosate (Roundup) directly to leaves using a paintbrush or sponge.
• Shield desirable plants; avoid drift.
• Multiple applications may be necessary.

Long-Term Management

• Install deep edging (12+ inches) to block rhizome spread.
• Plant in contained beds or pots sunk into the ground.
• Accept that ongoing vigilance is required—it's a "constant battle."

Despite its invasiveness, many gardeners keep it for its heavenly spring fragrance and delicate bell flowers.