Discover a herbicide that does what others can't

By Lisa Beirn, Ph.D., technical services manager for Syngenta

With Tenacity® herbicide, you can control weeds at the same time you seed. Most herbicide products remove weeds from established turf, but Tenacity can also be used to prevent weeds from emerging in newly seeded or overseeded turf. When grass seed has a chance to grow without weed competition, root establishment is stronger, resulting in a healthier, denser turf stand.

A recent survey of lawn care operators1 found:

  • 97% said they value Tenacity because it has unique benefits other herbicides can’t deliver (e.g., pre AND post emergence, use at seeding, selective control of bentgrass, etc.)
  • 97% said Tenacity delivers consistently good results for their customers
  • 97% said they value Tenacity for its flexibility to be used at seeding as well as for pre- and post-emergent weed control
  • 90% said their customers have noticed fewer weeds in their lawn since they started using Tenacity

Give your customers an overview of how you can selectively protect their turf from weeds with Tenacity. Order free copies of the Selective Herbicide Brochure at

Whether you want to overseed in the spring or fall, re-seed bare areas or remove grass weeds like creeping bentgrass from your turf, Tenacity can help.

Seeding with Tenacity

Tenacity may be applied to labeled turfgrasses anytime up to, during and after seeding, but prior to emergence. Tenacity is one of the few herbicides that controls weeds during the seeding process and provides pre- and post-emergent control of many weeds. View the Tenacity and Hydroseeding Information Sheet to learn more about hydroseeding with Tenacity.

University of Maryland trial, 2010. Tenacity was applied at 5 oz. + 5 oz./A and Tupersan® herbicide was applied at 24 lb./A.

Applications are made based on comparable label recommendations. Performance evaluations are based solely upon interpretation of public information and field observations.

Keys to success

  1. Apply Tenacity at 5-8 fl. oz./A prior to, during or after seeding. A good quality non-ionic surfactant is recommended if weeds are present at time of application.
  2. Repeat application after second mowing, or three to four weeks after seedling emergence.
  3. Use the low rate (5 fl. oz./A) for existing stands containing greater than 50% ryegrass or fine fescue. Do not use on seed mixtures containing more than 20% fine fescue by weight.

White means it is working

Short-term, transient whitening may result from Tenacity applications. Its mode of action prevents production of carotenoids in new leaf tissue, a key stabilizer of chlorophyll (green color) in plants. This may also occur in new seedlings of the desired turfgrass species. The effect is temporary and with regular mowing, normal growth of green tissue resumes.

The resulting turfgrass stand will be weed-free during establishment and help ensure a healthy stand of grass.

For a complete list of target weeds controlled, view the Tenacity label. Below is a list of some common weeds controlled by Tenacity:

  • Common chickweed
  • Common dandelion
  • Creeping bentgrass
  • Crabgrass- large, smooth & southern
  • Florida betony
  • Ground Ivy
  • Henbit
  • Large hop clover
  • Lawn burweed
  • Mouseear chickweed
  • Nimblewill
  • Oxalis
  • Speedwell – persian, purslane
  • Annual bluegrass suppression
  • Shepherd’s purse
  • Sowthistle
  • Swinecress
  • White clover
  • Wild violet
  • Yellow nutsedge

Tenacity is also available in a convenient 8-ounce bottle that lets you measure the exact dosage without the need for a syringe. Check out the results below:

The Silver Cymbal video content referenced is a compensated endorsement.

To learn more about how Tenacity can control troublesome weeds in your area, contact your local Syngenta territory manager.

1Source: TechValidate survey of lawn care operators use of Tenacity, April 2022. N=33

Always consult the product label for complete use and application information.

All photos and videos are either the property of Syngenta or are used with permission.

Product performance assumes disease presence.

Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations. Trials reflect treatment rates and mixing partners commonly recommended in the marketplace.

© 2024 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties and/or may have state-specific use requirements. Please check with your local extension service to ensure registration and proper use. Tenacity® and the Syngenta logo are trademarks of a Syngenta Group Company. Tupersan® is a registered trademark of Gowan Company.

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