Eradicating Wild Violets: Persistent Perennial Weed

Wild violets (Johnny-jump-ups) invade lawn. Tuberous rhizomes survive surface treatments. Needs eradication strategy.

Why They're Tough

• Rhizomes + tubers = energy reserves
• Waxy leaves shed herbicide
• Cool-season growth (spring/fall) when lawns vulnerable
• Seed + vegetative spread

Herbicide Strategy

Timing: When Actively Growing

• Mid-spring (flowering) OR mid-late fall (carbohydrate storage)
• Multiple applications 3-4 weeks apart
• 2-3 years for complete control

Effective Chemicals

Pre-Emergent (Prevention)

• Prodiamine, dithiopyr, pendimethalin in spring
• Blocks seed germination only
• Siduron (Tupersan) if seeding

Cultural Suppression

• Mow high (3.5-4") - shades violets
• Dense turf via overseeding/fertilizing
• Improve drainage - violets love moist soil
• Sunny, dry conditions weaken them

Organic/Manual

• Dig entire root system (tubers + rhizomes)
• Sheet mulch: cardboard + 4" mulch for season
• Iron HEDTA (Fiesta) - burns broadleaves, grass-safe

Application Tips

• Add surfactant (spreader-sticker) - cuts wax
• Spray when no rain 24 hrs, <85°F, low wind
• Don't mow 2 days before/after
• Mark treated spots for follow-up

Persistence wins. Combine fall triclopyr applications with spring pre-emergent and cultural density. Expect 2-3 year campaign.