Astro turf. No grass can grow in heavy shade.

Your neighbor is drunk if he seen turf under a tree.

It was growing fine years ago because the trees were much smaller!
I would not try to grow grass under huge trees.
I would either mulch the area or put down decorative stone!

What about creeping red fescue?

"What about creeping red fescue?"

It's certainly an option, and is probably the most shade tolerant of the major cool season grasses, but my only worry would be if it could tolerate the heat and humidity of St. Louis. To be honest any grass in those conditions is going to struggle, including tall fescue. NTEP tests fine fescues in Virginia, so if you do decide to go that route, then use varieties that perform best there. The Kentucky location doesn't mow it's fine fescue plots, so that data is probably not very good for your needs.

Tiemco has a good point. Fine fescues do well with less sun, less water and less fertilizer than tall fescue and KBG, but fine fescues tend to suffer in heat. They'll often go dormant even if they have sufficient water. If the shade makes it cool enough, creeping red fescue may work fine, but it's likely to go dormant for a good portion of the summer in STL.

Texas Weed, Have you got a loose screw in your head or something? Your statement, No grass can grow in heavy shade." Whatever.......Have you ever been to Louisiana and gazed upon some of those beautiful St. Augustine yards that have been there for decades under gigantic Oaks and Pine Trees? It grows right up to the trunks. I can't get that coverage where I am but I have seen it many times all over Louisiana.

I think one person's "dense shade" is another person's 'filtered sunlight.' I talk about my yard having dense shade but I don't have to go very far down the street to find yards with a lot more shade than I have.

The densest shade comes from dense trees that are low to the ground. As the canopy moves away from the ground, more light comes in and the grass gets better access to the sun.

Texas Weed, Have you got a loose screw in your head or something? Your statement, No grass can grow in heavy shade."

No but apparently you do if you think grass can grow in heavy dense shade. Yeah some varieties of Saint Augustine can grow in filtered shade, not all, but that do tolerate shade still needs at least 4 hours of direct sunlight. As Dave says you can raise the canopy up to get enough morning and afternoon sun, but heavy dense shade no grass will grow.

A few of my screws have fallen out so I still think you may have a few loose ones. Better get them checked.

A few of my screws have fallen out so I still think you may have a few loose ones. Better get them checked.

Will do thanks ole friend. :>)