Best Edging to Keep Grass Out of Flower Beds

If you’re tired of creeping grass invading your flower beds, you’re not alone. Grass roots (rhizomes) and stolons can sneak past shallow barriers, choking your perennials and ruining the clean lines of your garden. The best edging to keep grass out of flower beds creates a physical and visual barrier that stops grass at the source—without harming your plants.

In this guide, we break down the top edging materials, installation tips, and costs to help you choose the perfect solution for your landscape. Whether you prefer a natural look or a modern metallic border, we’ve got you covered.

Top Edging Materials Compared

How to Choose the Right Edging

Selecting the best edging to keep grass out of flower beds depends on your budget, garden style, and the type of grass you’re fighting. Here’s what to consider:

• Grass Type: Bermudagrass and quackgrass have aggressive rhizomes that can go 6–8 inches deep. For these, choose steel or deep plastic edging (at least 6 inches below ground).
• Aesthetic: Steel and aluminum offer a clean, modern line. Stone and brick are classic and rustic. Plastic is the most versatile for curves.
• Installation: Plastic and steel can be DIY-installed. Stone and brick are best left to professionals unless you’re experienced.
• Budget: Plastic is the most affordable; stone is the most expensive. Steel offers a good mid-range option with longevity.

Step-by-Step Installation Guide

1. Plan your border: Use a garden hose or spray paint to mark the edge of your flower bed.
2. Cut a trench: Dig a trench about 6 inches deep and 2 inches wide along the line.
3. Install edging: Place the edging material in the trench, ensuring it's level and snug against the soil.
4. Backfill and compact: Pack soil firmly against both sides of the edging to eliminate gaps where grass can sneak through.
5. Add mulch: Apply a 2-3 inch layer of mulch inside the bed to suppress any remaining grass and retain moisture.

If you’re looking for a professional touch, consider custom concrete curbing for a seamless, permanent border.

Frequently Asked Questions

What is the best edging to keep grass out of flower beds?

Steel or aluminum edging is widely considered the most effective because it creates a solid, deep barrier that grass roots cannot penetrate. For a more natural look, stone or brick also work well but require professional installation.

How deep should edging be to stop grass?

Experts recommend at least 6 inches deep for most grasses. For aggressive species like Bermudagrass, go 8 inches or deeper.

Can I use plastic edging to keep grass out?

Yes, but choose commercial-grade plastic (at least 5mm thick) that is UV-stabilized. Budget plastic edging can become brittle and fail within a few years.

How much does professional edging installation cost?

On average, professional installation runs $5–$15 per linear foot, depending on the material. Steel edging installation is typically in the $10–$20 range.