How to Edge Mulched Beds Properly
Spade-cut, plastic edging, steel edging, brick — five edging options ranked by labor, cost, and lifespan.
Crisp, well-defined edges between mulched beds and lawn are half of curb appeal. The other half is the mulch itself. This tutorial walks through three edging methods, from quickest to longest-lasting. Use our mulch calculator for bed sizing.
Quick spade edge (annual refresh)
Use a flat spade. Cut a 4-inch deep V-shaped trench between bed and lawn. The bed side is vertical; the lawn side slopes back at 45 degrees.
The trench takes about 10 minutes per 50 feet of edge. Annual refresh in spring is needed because grass roots colonize the edge over the growing season.
Semi-permanent edging materials
Aluminum edging (3-4 inch height) sets the line for 10+ years. Drives into soil with a hammer or rubber mallet. About $2-4 per linear foot.
Steel edging (corten or galvanized) — 20+ year lifespan, decorative weathered look (corten) or clean (galvanized). $5-8 per linear foot.
Brick or stone — permanent, decorative, $10-20 per linear foot installed. Set in mortar for the longest lifespan.
Installation steps for hard edging
Mark the desired bed line with a hose or rope. Adjust until the curves look right from the main viewing angle.
Cut and remove sod along the marked line. Excavate 4-6 inches deep depending on edging height.
Set the edging level. Backfill on both sides. Tamp firm. Apply mulch on the bed side.
Maintenance
Spade edges need annual refresh in spring (March-April in zones 6-7).
Aluminum and steel edges need only occasional realignment if frost heave shifts them.
Brick and stone edges need mortar repair every 5-7 years in freeze-thaw climates.
Related reading
- 10 Decorative Mulches for Front-Yard Curb Appeal — Black dyed, river rock, dark cedar — 10 mulches photographed from the street and ranked.
- How to Spread Mulch Properly: A 6-Step Pro Guide — Edge, lay, fluff, smooth — the spreading technique professional landscapers use to make a yard look magazine-finished.
- How to Prevent Mulch Color Fading: A Pro Guide — Why dyed mulch fades, which dyes hold up best, and the maintenance schedule that keeps color all season.
- How to Prevent Mulch from Blowing Away — Material choice, edging, weight, and the spring soak-down routine that locks new mulch in place.
Frequently asked questions
What is the cheapest way to edge a mulched bed?+
Spade edge — free, takes 10 minutes per 50 feet. Annual refresh required.
Is aluminum or steel edging better?+
Aluminum lasts 10+ years and costs less. Steel lasts 20+ years and offers decorative options (corten weathered look).
How deep should I cut a spade edge?+
4 inches. Cut vertical on the bed side and 45-degree slope on the lawn side.
Will edging prevent mulch migration?+
Yes — hard edging contains mulch displacement from wind, foot traffic, and rain.
How often do I refresh a spade edge?+
Annually in spring. Grass roots colonize the trench over the growing season.
References & further reading
Sources we lean on for the figures, definitions, and best practices in this post.
- wikipediaWikipedia — Mulch
- extensionClemson Cooperative Extension — Mulch
- wikipediaWikipedia — Landscaping