Eradicating Persistent Honey Locust with Herbicide Strategy

Thirty-year-old honey locust surviving salt, oil, and coffee cans needs systemic herbicide. Glyphosate or triclopyr on foliage kills root system.

Herbicide Options

1. Glyphosate (Roundup): 1.5-2% solution (2-2.6 oz/gal) foliar spray on sprouts
2. Grazon P+D: 1 gal + 1-2 qt surfactant/100 gal, spring application
3. Remedy (triclopyr): 1-2 qt/100 gal, post-spring growth

Application Protocol

• Treat actively growing sprouts (4'+ tall for brush herbicides)
• Thorough coverage essential
• Repeat as needed—depletes massive root reserves
• Expect 1-2 years of persistence

Why Previous Methods Failed

• Salt/oil: Surface only, don't translocate
• Coffee can: Blocks light but roots survive on reserves
• Cutting alone: Stimulates vigorous resprouting

Systemic herbicide is the only method that reaches the extensive root system. Your persistence will eventually win.