Question
I live in Dallas area and most of the neighbors has bermuda grass lawns. My next door neighbor recently decided to pull up the bermuda grass and install st. augustine grass. My fear is the st. augustine grass will spread into my yard. Do I need to put some sort of border between the yards? If so, any ideas?

Thanks!

Answer
St Augustinegrass and Bermudagrass are very different species.  Bitterblue and Seville strains of St Augustine can take a LOT of shade, and St Augustine generally is considered reasonably shade-tolerant.  Bermuda can't.

St Augustine spreads in a flash with stolons -- above-ground runners.  But it has ZERO tolerance for traffic.

Go over to the edge of your property line and make a clear demarcation point to separate your plot from your neighbor's.  Yank all renegade St Augustinegrass stolons that dare cross the property line into the Bermuda lawn.

But bear in mind that St Augustine probably does not have the kind of aggressive will to overtake Bermuda.  Bermudagrass on the other hand generally overtakes St Augustinegrass in any contest like this; it is more aggressive and grows at ground level, creeping along with underground rhizomes.  One professional I know nailed aluminum roof flashing to a series of wood 4 x 4's, then inserted them into the ground to halt the spread of a neighbor's unwanted Grass into his yard.  This does however demand due diligence to keep both Grasses contained.

Thanks for writing.

THE LONG ISLAND GARDENER