Wild Violet Control Guide

How to Identify Wild Violet

Wild violet has three signature features that separate it from other heart-shaped-leaf lawn weeds:

• Heart-shaped to kidney-shaped leaves with scalloped edges, growing from a basal rosette with each leaf on its own stem rising from the crown.
• Five-petaled purple, blue-purple, or white flowers in spring, on slender stems above the rosette.
• No smell when leaves are crushed. This separates wild violet from creeping charlie, which has opposite leaves on square stems and a mint smell.

Growth pattern: Penn State says wild violet forms thick, branching rhizomes that give rise to new plants, grows best in moist, fertile soils, and persists in both full sun and shade. It tolerates mowing at any height. We have not found a published per-year spread rate, so we do not give one.

Why Spring Spraying Fails

Most homeowners notice wild violet when it flowers in spring. The instinct is to spray the broadleaf product already in the garage, usually a 2,4-D, dicamba and MCPP three-way mix. Those products handle dandelions and clover. Wild violet is a different problem.

Penn State gives two reasons. Wild violet has a thick, waxy cuticle that interferes with herbicide uptake. It also has robust underground rhizomes with strong recuperative potential. Burn the leaves without reaching the rhizomes, and the plant regrows.

Penn State says herbicides containing triclopyr provide the best control. Two sources of triclopyr for home lawns: Turflon Ester Ultra, a professional concentrate, and Ortho Weed B Gon Chickweed, Clover & Oxalis Killer for Lawns Concentrate (8% triclopyr triethylamine salt). Read the active ingredient list, not the brand name.

The Fall Window

Purdue research by Zac Reicher found that broadleaf herbicides applied from October 1 through November 1 improved long-term ground ivy control compared with the same herbicides applied in September. Purdue's ground ivy and violet article says the findings would likely apply to violet. Three practical conditions:

1. Apply in October. Purdue's explanation is that late-fall applications either kill weeds directly or weaken them so they succumb to winter.
2. Pick a dry, warm, sunny day. Purdue's guidance is above 55°F.
3. Leaves must still be green. The herbicide goes in through the foliage.

Spring applications are a touch-up, not a program. Iowa State work cited by Purdue found a second application 3-4 weeks after a late May application improved control. Penn State says repeat applications over the growing season and over multiple years may be needed.

Mix Rate: Where the Label Meets Purdue's Floor

Purdue says for best control, use more than 0.5 lb of triclopyr per acre. It notes that Turflon Ester Ultra at 1 pint per acre delivers 0.5 lb, and 1 quart per acre delivers 1.0 lb. The Turflon Ester Ultra spot-treatment rate is 3/8 to 3/4 fl oz per 1,000 sq ft.

Put those side by side. One pint is 16 fl oz per acre. Divided across 43.56 thousand square feet, that is about 0.37 fl oz per 1,000 sq ft, which is the 3/8 fl oz bottom of the label range. The top of the range, 3/4 fl oz, is about 33 fl oz per acre, or roughly 1 lb of triclopyr. So mixing at the low end of the label puts you right at the floor Purdue says to exceed. Mix toward 3/4 fl oz per 1,000 sq ft. Stay at the bottom and you pay for an application that sits at the edge of what Purdue calls best control.

Product Selection

• Turflon Ester Ultra (triclopyr): professional concentrate. Spot rate 3/8 to 3/4 fl oz per 1,000 sq ft; broadcast 1/2 to 1 quart per acre. Labeled for tall fescue, perennial ryegrass and bluegrass lawns only.
• Ortho Weed B Gon Chickweed, Clover & Oxalis Killer for Lawns Concentrate (8% triclopyr): 1 fl oz per gallon of water per 200 sq ft. Not for bahia, bermuda, centipede, kikuyu or St. Augustine lawns.
• SpeedZone EW (carfentrazone + 2,4-D + MCPP + dicamba): lists wild violet on its label, but it is not a triclopyr product. Its label says not to apply it to St. Augustine, centipede, bahia or carpetgrass.

Why Wild Violet Keeps Coming Back

• The shade condition isn't addressed. Wild violet fills in where turf thins. Killing violet without raising mowing height, limbing up tree canopy, or overseeding shade-tolerant fine fescue leaves room for the next wave.
• The treatment is applied only once. Penn State says repeat applications over the season and over multiple years may be needed. Plan a spring touch-up after the fall application.

For deep shade where violet won't quit, consider whether uniform turf is the right goal. A groundcover, or a managed violet patch for pollinators, may suit the site better than yearly herbicide.

Frequently Asked Questions

Why doesn't my usual weed killer kill wild violet?

Penn State Extension says wild violet is hard to control because of a thick, waxy cuticle that interferes with herbicide uptake and robust underground rhizomes that let it recover. It says herbicides containing triclopyr provide the best control. A spray that burns the leaves without reaching the rhizomes lets the plant regrow.

When is the right time to spray wild violet?

Fall. Purdue research by Zac Reicher found broadleaf herbicides applied from October 1 through November 1 improved long-term ground ivy control compared with the same herbicides applied in September, and Purdue notes those findings would likely apply to violet. Apply on a dry, sunny day above 55°F while leaves are still green. We have not found a published percentage comparing spring and fall kill on wild violet, so we do not quote one.

How do I identify wild violet versus other heart-shaped leaf plants?

Three field markers. (1) Heart-shaped leaves with scalloped edges, each on its own stem rising from the crown. Creeping charlie instead has opposite leaves on square, creeping stems. (2) Five-petaled purple, blue-purple or white flowers in spring. (3) No mint smell when crushed. Creeping charlie smells of mint.

Will repeated mowing kill wild violet?

No. The leaves regrow from the crown and the rhizomes stay intact at any mowing height. Wild violet also produces small self-pollinating flowers near the soil surface that mowing does not remove.

My lawn is shaded under a maple. Will wild violet take over no matter what I do?

Wild violet takes over where turf thins, and shade thins turf. Penn State notes it persists in both full sun and shade. The durable fix combines fall triclopyr with more light (limbing up the canopy), overseeding a shade-tolerant fine fescue in fall, and accepting mulch or groundcover in the deepest shade.

Can I dig out wild violet by hand?

For very small patches, yes. Penn State says wild violet forms thick, branching rhizomes that give rise to new plants, so lift the whole root mass and any rhizome pieces. Bag the plants rather than composting them.

Are wild violets bad for the lawn or should I leave them?

Wild violet is a native North American plant that supports native bees and is a host plant for fritillary butterflies. It is not harmful to the lawn beyond crowding out grass. The choice to kill or keep it is aesthetic.

Will glyphosate kill wild violet faster than triclopyr?

Glyphosate is non-selective, so it kills the surrounding grass too. It fits an isolated patch you plan to reseed. Inside an otherwise healthy lawn, triclopyr is the selective option. Never broadcast glyphosate over a lawn.

Related Resources

• Lawn Weed Identification & Control Pillar: full pillar with all weed types
• Creeping Charlie Control: the other heart-shaped-leaf perennial that needs triclopyr
• Dandelion Control: the easier broadleaf perennial that 2,4-D actually kills
• White Clover Control: broadleaf perennial that responds to fall application timing
• October Lawn Care: the primary triclopyr application month
• November Lawn Care: late-fall application window
• Fine Fescue Care: shade-tolerant overseed species for violet-prone zones
• Fine Fescue Master Guide: full reference on shade-lawn species selection
• Fall Lawn Care Hub: September-November program

Sources

• Penn State Extension: Wild Violet (triclopyr gives best control; waxy cuticle and rhizomes; repeat applications)
• Purdue Turfgrass Science, Aaron Patton: Wild Violets (more than 0.5 lb triclopyr per acre; pint and quart conversions)
• Purdue Turfgrass Science, Zac Reicher: Broadleaf Control Improves Later in Fall (October 1 to November 1 vs September; above 55°F)
• Purdue Turfgrass Science: Controlling Ground Ivy and/or Violets (findings likely apply to violet; second application 3-4 weeks after late May)
• Turflon Ester Ultra label directions (DoMyOwn) (spot and broadcast rates; labeled grasses)
• Ortho Weed B Gon Chickweed, Clover & Oxalis Killer for Lawns Concentrate (triclopyr; mix rate; grasses not to treat)
• SpeedZone EW label (wild violet listed; grasses not to treat)