How to Remove Grass From Flower Bed | Three Working Methods

Removing grass from a flower bed takes about 4-6 weeks using sheet mulching, a weekend with manual digging, or two spray applications with herbicide — the right choice depends on your timeline and grass type.

Bermuda grass requires a different approach than fescue or bluegrass. The three routes — manual removal, sheet mulching, and targeted herbicide — each have a best-use case and a common mistake.

Manual Removal: Best for Small Patches This Weekend

If the invaded area is 4×4 feet or smaller, digging by hand is fastest. Water the bed the day before. Mark the edge with rope or spray paint. Use a flat-edge shovel to cut vertical lines 3-4 inches deep, stepping to punch through sod. Cut parallel lines about a foot apart, then perpendicular lines, forming 1×1 foot squares. Pry each up and roll it like a carpet, shaking loose soil back into the bed. Rake to pull out root fragments. Early spring or fall is best timing. Wear gloves. For a dedicated tool, see our tested roundup of the best grass-removal tools.

Sheet Mulching: The Set-It-and-Forget Method

Sheet mulching smothers grass by blocking light with cardboard or newspaper topped with mulch. It works on large beds but requires patience. Mow grass as low as possible. Lay overlapping brown corrugated cardboard with tape and staples removed, overlapping edges by at least 2-6 inches. Use 6-10 sheets of newspaper (10 for aggressive grasses) with black-and-white ink only — colored inks can contain heavy metals. Soak thoroughly with a hose. Cover with at least 2 inches of mulch (straw, pine needles, or wood chips). Wait 4-6 weeks for most grasses. For invasive Bermuda grass, extend to 4-6 months and do not cut holes for planting — Bermuda will re-invade through any opening. To plant, cut an X, peel back flaps, dig hole, set plant, and fold cardboard back around stem. Common mistake: not wetting the barrier enough — dry cardboard won’t smother effectively.

Herbicide Application: Fast Results When You’re Careful

For speed or large, deep-rooted infestations, glyphosate-based herbicide is the most direct option. Apply on a calm day with no rain expected for 24 hours. Cover nearby plants. One application kills top growth; a second spray 2-3 weeks later catches regrowth. Wait one full week after the second application before planting. Do not pull dead grass; plant directly into it. Wear protective gloves. Glyphosate is non-selective, so drift kills any plant. For readers who prefer to skip chemicals, the sheet mulching method above is the reliable alternative.

Preventing Grass From Coming Back

Keep grass out with edging. Install solid pound-in edging at least 8 inches high. Dig a trench with a 3-4 inch vertical cut into the lawn side, then create a 30-45 degree slope back into the mulch. Pound edging level with the ground surface, with the bottom edge 8 inches below the grass line. This stops Bermuda, zoysia, and fescue runners. Reapply mulch annually, and spot-pull any grass that appears in the first few weeks.

Key Comparison: What Works for Your Grass Type

FAQs

Can I just till the grass under instead of removing it?

Tilling breaks grass roots into hundreds of fragments, and most common lawn grasses — especially Bermuda — regrow from any fragment left in the soil. Tilling usually worsens the problem.

How deep should edging be to stop grass roots?

For most lawn grasses, 8 inches below ground level blocks surface runners and shallow rhizomes. Edging at 4-5 inches is often bypassed by Bermuda and zoysia within a single growing season.

Will landscape fabric work the same as cardboard for smothering?

Landscape fabric lets light reach grass over time, and grass roots grow through its weave. Cardboard or thick newspaper blocks light completely and breaks down into organic matter, making it a better choice for smothering.