Kills Weeds and Grow Grass (At The Same Time!)

If you have a lawn that is riddled with weeds and has plenty of thin and bare spots, we have some really good news for you!

There is a way to kill weeds and grow grass at the same time!

Let's talk about how to kill existing weeds in your lawn at the same time as you overseed thin and bare spots with grass seed.

Restoring a Lawn Full of Weeds in 3 Steps

  1. Spray existing weeds in your lawn with the right selective herbicide
  2. Core aerate your lawn
  3. Spread grass seed

Restoring a lawn full of weeds is really as simple as stated in these 3 steps.

DIY Lawn Care Products Equipment

Step 1: Killing existing weeds is a very important step as weeds suck valuable water and nutrients from the soil which the grass seed will need to germinate.

Step 2: Aerating your lawn with a core aerator creates thousands of holes which creates a perfect environment for good 'seed to soil' contact which is very important in grass seed germination.

Step 3: If you want to grow grass, you will need to spread some grass seed!

Bonus - Important things to consider: The 3 steps noted above will get you results.  If you would like to increase the effectiveness of your lawn renovation, we have a couple additional tips.  

Consider a repeat application of weed control safe for grass seed 10-21 after your 1st application to gain control of hard-to-control weeds.  Consider applying a start fertilizer in addition to spreading grass seed after core aerating your lawn.  Water your lawn daily until the new grass has matured enough to be mowed at the same height as the rest of your lawn.

Tenacity Herbicide

Why you need to use Tenacity herbicide when treating weeds and sowing grass seed

Tenacity is hands down my favorite weed control product but there are some things you need to be aware of before using it.  We'll cover grass species Tenacity is safe to be used on and weeds controlled plus cover mixing ratios and how to apply it.

My only qualm with Tenacity is that is turns the weeds white as it works.  The weeds in your lawn will literally turn as white as a sheet of paper.  It's only temporary, but can be a shock if your lawn is full of weeds and you aren't expecting this!

For the best price on Tenacity herbicide, use our link below.  We may earn a small commission if you do choose to make a purchase.

Shop For Tenacity Online

Grass Types Tenacity is Safe For

Tenacity is safe for use on common grass types for lawns across the USA.

  • Kentucky bluegrass
  • Centipede
  • Tall fescue
  • Perennial ryegrass*
  • Fine fescue* (creeping red, chewings and hard)
  • St. Augustine* (grown for sod)

*Read label instructions

Weeds Controlled by Tenacity

The weeds controlled by Tenacity is what makes it so impressive!  It literally controls grassy weeds, nutsedge, common broadleaf weeds, and hard-to-control broadleaf weeds like wild violets and oxalis.

  • Barnyardgrass
  • Bentgrass, Creeping
  • Bluegrass, Annual
  • Buckhorn Plantain
  • Buttercup
  • Carpetweed
  • Chickweed, Common
  • Chickweed, Mouseear
  • Clover, Large
  • Clover, White
  • Crabgrass, Large
  • Crabgrass, Smooth
  • Crabgrass, Southern
  • Curly dock
  • Dandelion, Catsear
  • Dandelion, Common
  • Florida Betony
  • Florida Pusley
  • Foxtail, Yellow
  • Galinsoga
  • Goosegrass
  • Ground Ivy
  • Healall
  • Henbit
  • Lambsquarters, Common
  • Lawn Burweed
  • Lovegrass, Tufted
  • Marestail
  • Nimblewill
  • Nutsedge, Yellow
  • Oxalis
  • Pigweed,Redroot
  • Pigweed, Smooth
  • Purslane, Common
  • Shepherd's purse
  • Smartweed, Pale
  • Smartweed
  • Pennsylvania
  • Speedwell, Persian
  • Speedwell, Purslane
  • Sowthistle
  • Swinecress
  • Thistle, Canada
  • Verbena
  • Wild Carrot
  • Wild Violet
  • Windmillgrass

Tenacity Herbicide Graduated Syringe

Tenacity Mixing Instructions & Application Method

Tenacity is best applied using a handcan or backpack sprayer.  Reference the table below for the amount of tenacity to add to your mix depending on the number of gallons of water your handcan or backpack sprayer holds.

Gallons of Water Amount of Tenacity
1 Gallon 1/2 Teaspoon
2 Gallons 1 Teaspoon
4 Gallons 2 Teaspoons


1 bottle of Tenacity goes a long way!  To make measuring Tenacity as easy as can be every bottle comes with a graduated cylinder syringe with the same information in the table clearly written on it.

Shop For Everything You'll Need To Renovate Your Lawn Online

If you are ready to get started, we have links below to all of the products and equipment you will need to renovate your lawn.

Our equipment and product recommendations are for DIY lawn care homeowners and lawn care companies, we'll leave notes if you should know any additional information.


Buy Handcans or Backpack Sprayers Online

Buy This Broadcast Spreader For Grass Seed & Fertilizer*

*If you are a company, consider purchasing a true commercial-grade broadcast spreader but the one we recommend above is very well built and could certainly be used for commercial use.


Buy Grass Seed Online*

*Be sure to buy the appropriate type of grass seed for your area!

Buy Tenacity Online

Buy Starter Fertilizer Online

Ryan Sciamanna

Ryan is the owner and founder of Lawn Crack, LLC the parent company of iGoPro Lawn Supply. He has worked in almost every capacity within the lawn and landscape industry for small local companies, nationwide companies, and of course, owning his own lawn & landscape business which he sold in 2018 before starting selling lawn and garden products online. Learn more about Ryan by subscribing to the LawnCrack YouTube Channel.