Any suggestions on what maintenance I should be doing into the third year? I have never aerated. Yard looks great. I put down an Atrazine / feed twice a year and try not to water too much. Mow on highest setting.

Have you tried Palmetto St Augustine? Delmar?

Now with that said Raleigh SA is one of the least shade tolerant of the SA grasses. Check around and see if you can get Palmetto SA as it is one of the most shade tolerant SA grasses and has some of the best cold tolerances of SA like Raleigh.

But to answer your question directly there is no grass that you can mix with SA that has better shade tolerance and use atrazine on as both the shade and atrazine will kill any other grass. And if you are talking deep shade, no grass will grow there.

To increase your chance thin and raise the canopy up to allow more light under the trees, and maintain your SA as high as your mower will cut as this maximizes leaf surface area to take in as much sun as possible.

The label is attached.

FOR RETAIL SALE TO AND USE ONLY BY CERTIFIED APPLICATORS OR PERSONS UNDER THEIR DIRECT SUPERVISION, AND
ONLY FOR THOSE USES COVERED BY THE CERTIFIED APPLICATOR'S CERTIFICATION.

It is a federal law policed by the EPA.

"Manufacturers have elected to label professional liquid formulations of atrazine as a Restricted Use Pesticide, so that only licensed users may apply those formulations, with the stipulation that they may not be applied after tax day, April 15th, until October 1st, although different labels describe this differently. (Surprisingly, homeowners can purchase both granular weed-and-feed mixtures as well as certain liquid atrazine formulations, and do not have strict prohibition from April 16 through September 30th)."

In any case, lest we venture too far off topic, keithw, you should not be using a weed and feed product. Use them separately. Feed first and come back in 2 weeks to spot spray individual weeds.

And get a couple pieces of a more shade tolerant St Aug for your shady areas. You'll be fine.

When I say atrazine can be put on bermuda or zoysia, I was stating that in terms of biology, not terms of law.

Ambiguous terms strike again.

Well then I apologizes to all as I was referring to professional use products. The link that was given in this thread is for aerial use from helicopters and airplanes, or commercial farming with tractor sprayer. All personal using and handling it has to wear PPE gear.

But to be honest I did not realize they sold consumer grade in the liquid form. I truly thought it was only available to consumers in the granular forms. I can only guess the concentration level is so low that it is not considered hazardous to humans. Kind of hard to imagine because the professional grade stuff requires protective clothing, gloves, boots, and face shields to use and mix. Heck even the flaggers for crop dusting are required to wear PPE and respirators.

Sorry for the confusion TW.

Ok 4% vs 43%. Makes sense now.