Protecting your seeding investment from the start

By Ron Townsend, M.S., technical services manager for Syngenta

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

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 germinating in newly seeded or overseeded turf. When grass seed has a chance to grow without weed competition, fall root establishment is stronger, resulting in a healthier, denser turf stand in the spring.

Lawn care operators were asked about their experiences with Tenacity. Here’s what they had to say:

  • 97% of those surveyed said they value Tenacity for its flexibility to be used at seeding as well as for pre- and post-emergent weed control
  • 88% of those surveyed that used Tenacity at seeding said it allows them to seed bare ground without any weeds emerging
  • 97% of those surveyed 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.).1

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

Seeding with Tenacity

Tenacity herbicide may be applied to labeled turfgrass species anytime up to, during and after seeding, but prior to turf emergence. Tenacity controls weeds during seeding and provides pre-emergent and some post-emergent control of many weeds. View the Tenacity and Hydroseeding Information Sheet to learn more about hydroseeding with Tenacity.

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 emergence.
  3. Use the low rate (5 oz./A) for existing stands containing greater than 50% ryegrass. 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 and southern
  • Florida betony
  • Ground ivy
  • Henbit
  • Large hop clover
  • Lawn burweed
  • Mouse-ear chickweed
  • Nimblewill
  • Oxalis
  • Speedwell – persian, purslane
  • Annual bluegrass suppression
  • Shepherd’s purse
  • Sowthistle
  • Swinecress
  • White clover
  • Wild violet
  • Yellow nutsedge
To learn more about how Tenacity can control troublesome weeds in your area, contact your local Syngenta territory manager.

1Source: TechValidate survey, April 2022. N=33.

© 2023 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. All other trademarks are the property of their respective third-party owners. 

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