A lawn edger is worth buying if you have hard-surface borders — driveways, sidewalks, or garden beds — where grass consistently creeps over the line, since no string trimmer held at an angle replicates the clean vertical cut a dedicated edger delivers.

A lawn edger works by spinning a steel blade vertically through the soil line rather than horizontally across grass tops, which is what makes the border definition so sharp and long-lasting. For yards with fewer than 50 linear feet of hard-edge borders, a string trimmer used carefully can substitute. But for larger properties or anyone who wants a professional-looking edge line that holds for 7–10 days between maintenance sessions, a dedicated lawn edger justifies the cost and storage space.

  • Lawn edgers produce a vertical cut 1–3 inches deep along hard borders; string trimmers cut at roughly 30–45 degrees.
  • Electric corded lawn edgers typically run 12–15 amps; battery-powered models run on 40V–80V platforms for comparable runtime.
  • A lawn edger edge line holds definition for approximately 7–10 days on actively growing turf in summer.
  • Gas-powered lawn edgers weigh 10–18 lbs; battery-powered models typically run 8–13 lbs depending on blade width.
  • Blade widths on walk-behind lawn edgers range from 7 to 9 inches; 8-inch blades are the most common residential size.

How to Choose

  • Pick a dedicated lawn edger if: your property has 50+ linear feet of hard borders — driveways, sidewalks, or concrete beds — where grass regrows over the edge every week.
  • Pick a corded electric lawn edger if: your border runs are close to the house and you want lighter weight at 12–15 amps without managing battery charge between sessions.
  • Pick a 40V–80V battery-powered lawn edger if: your hard borders extend past cord range or across the front and back yard in a single session without stopping.
  • Skip a lawn edger and use a string trimmer if: your hard-surface borders total fewer than 50 linear feet and you already own a trimmer you're comfortable angling vertically.
  • Pick a gas-powered lawn edger if: you're edging a large property — over a quarter acre of border footage — where battery runtime or cord access makes electric models impractical.