Identifying and Controlling Wild Onion in a Rochester, NY Lawn

The Culprit

Shiny, grass‑like tufts with small bulbs (hundreds per clump) emerging in spring are wild onion (Allium vineale)—a horrible, persistent perennial weed.

Why It’s Tough

• Bulbs and bulblets break off easily, each capable of regenerating.
• Waxy leaves repel most herbicides.
• Grows in dense patches around trees and across lawns.

Best Eradication Method

1. Before lawn renovation, dig out entire clumps with a wide margin of soil.
2. Sift soil carefully to remove every bulblet.
3. Return clean soil.

In an established lawn, eradication is extremely difficult. Spot‑treat with a brush‑on glyphosate or a specialized wild onion herbicide (e.g., metsulfuron) if labeled for turf, but expect multiple years of effort.

Prevention

Clean mowers and tools after working in infested areas to avoid spreading bulblets.