Controlling Grass in Monkey Grass (Liriope)

Unwanted Grass Invading Monkey Grass Beds

A gardener divided their monkey grass (Liriope) and now faces invasive grass growing among the clumps. Weed-B-Gon killed the monkey grass in a test spot. They want to avoid using a weeder or mower.

Identify Your Monkey Grass Type

• Solid green Liriope – unwanted grass blends in; just trim taller grass blades with a string trimmer to match height.
• Variegated Liriope – grass is more visible; must be removed by hand.

Control Methods

1. Hand removal – use a hand trowel to dig out grass roots. Tedious but effective for variegated types.
2. Foam herbicide – apply a foam formulation (e.g., Roundup Foam) directly to grass patches, shielding monkey grass with cardboard. Targets specific spots without overspray.
3. Prevent grass clippings – mow so clippings blow away from beds.

Important Note

Standard Weed-B-Gon (containing 2,4-D) can damage Liriope. Always test a small area first. Foam or gel herbicides allow precise application.