Eradicating Invasive Wild Roses: Herbicide Timing & Mechanical Control

Wild roses (likely Rosa multiflora or similar) laughing at Roundup? You're using the wrong strength at the wrong time.

Why Your Herbicide Failed

• Consumer Roundup (1-2% glyphosate) only kills grasses/annuals
• Woody brush requires 18-41% concentrate ("stump & vine" strength)
• Application timing is everything: spray at peak growth (late spring)

Effective Chemical Protocol

1. Buy 41% glyphosate concentrate (farm supply stores)
2. Mix per label for woody brush (typically 2-3 oz/gal)
3. Choose sunny, calm day, 60-80°F, no rain forecast 24 hrs
4. Spray to drip—cover every leaf, stem, base
5. Wait 2 weeks. Re-treat regrowth.

Mechanical + Chemical Combo (Most Reliable)

1. Mow/bush-hog to 6 inches in early summer
2. Allow 12-18" regrowth (maximizes leaf surface)
3. Hit with concentrated glyphosate
4. Repeat annually for 2-3 years

Why It Takes Years

Wild roses root 4+ feet deep. One inch of stem regenerates. Seed bank persists. Persistence beats strength.

Wear protective gear. Follow all label laws. Consider professional application for large infestations.