You all think you have a grass type problem. Wait till some Bermuda grass starts showing up. YUCK!

Or you could spray round-up on your side of the line. Then maybe they would complain about your brown spots? St. Augustine and other grasses can send out runners that go under or over bricks or blocks.

I had no idea there were different types of St. Augustine. Thank you for this info.

If I had to guess, I would guess The Villages has Floratam St. Augustine? Is that the sod that is sold in Home Depot and Lowes here in The Villages?

South of 44 in District 13, where I live, they used ProVista SA that is glyphosate tolerant, (eg; Roundup), but according to a different thread, they may have switched to Floratam in District 14, (Dabney and Lake Denham).

I’m not sure about the areas north of 44 that have SA as the original sod but I would guess Floratam.

Looking on the Lowe’s and Home Depot websites, it shows they offer three or four different SA cultivars from two different sod farms.

This will knock down the Bremuda and other grassy weeds like sand spur.

Take a rake to pull the runners up before straying.

It can (will) take several applications per the instructions.

https://a.co/d/2V2FY2N

I like this little sprayer for spot application.

Solo 420 2-Liter One-Hand... Amazon.com

If you both have St. Augustine, I would not do anything. Creepers are in that type of grass. If neighbor had Zoysia, different story.