How to Water a Bermuda Lawn in New Braunfels: Rocky Soil, One Watering Day, No Irrigation

The two things we see go wrong most often on lawns around New Braunfels, San Marcos and Seguin aren't weeds or bugs. They're not enough soil and the wrong watering. The first one you mostly inherited from the builder. The second one you can fix this week.

Start with what's under the grass

Dig a hole in most newer-subdivision yards here and you'll hit rock within two or three inches. The builder laid Bermuda sod over a thin layer of fill on top of limestone and caliche. That fill drains fast and holds almost nothing, so water you put down on Monday is gone by Wednesday, and a long soak just runs off or puddles on the rock. A Bermuda lawn on that profile has shallow roots because there's nowhere deeper to go, and shallow roots are why the lawn goes gray and crunchy in July no matter how much the water bill says you put on it.

You can't change the rock. You can change how you water on top of it, and over a few seasons you can build soil over it.

The schedule that works on this soil

On your assigned watering day, run each zone for about 20 minutes in the early morning, before sunrise if your controller allows it, and then run each zone for another 20 minutes that evening. Two short cycles, same day. Splitting it lets the first round soak in before the second goes on, instead of one 40-minute run that overwhelms three inches of fill and sends the rest down the gutter. If you're hand-watering with a hose and a sprinkler, the same idea applies: move it every 20 minutes rather than leaving it in one spot for an hour.

During NBU's drought stages that's all you get, and on this soil it's enough to keep Bermuda alive through August if the lawn isn't fighting other problems. Bermuda is built for this. It will thin out and brown in a bad stretch, and it will come back when the rain does. St. Augustine won't, which is one reason the builders put Bermuda in.

What not to do

• Don't water in the heat of the day. On a 100-degree afternoon a good share of it evaporates before it reaches the roots.
• Don't water a little every day even when restrictions allow it. Daily light watering keeps roots in the top inch, which is exactly where the heat is.
• Don't ignore runoff. If water is sheeting off onto the sidewalk after ten minutes, that zone is done for now; it's not absorbing anymore. Shorter cycles, more of them.
• Don't skip the day after a treatment. Pre-emergent needs about a quarter inch of water within a few days to activate. We time applications ahead of your watering day; if you're not sure which day is yours, tell us and we'll schedule around it.

Building soil so you can water less

The lasting fix for rocky fill is to add organic matter on top of it, which is what top dressing is. A layer of compost over the lawn once a year, spring or fall, adds the material that actually holds water between waterings. Lawns we've top dressed for a few seasons need noticeably less water to stay green, and they're the ones that look best in a dry August. If your lawn also has low spots that scalp when you mow, leveling with a sand-and-compost mix in spring does the same job and smooths it at the same time; NBU grants a temporary watering variance while a leveled lawn recovers, and we have a guide to requesting one.

Mow high, water deep

One more thing that costs nothing: raise the mower. We mow residential Bermuda that hasn't been leveled at about 3 inches. Taller grass shades the soil, slows evaporation, and pushes roots deeper. Scalping a Bermuda lawn to an inch in June is the fastest way to turn a watering problem into a dead-lawn problem.

When watering isn't the problem

If you're watering right and the lawn is still pale, it's probably iron. Our alkaline soil locks up iron so the grass can't use it, and no amount of water or nitrogen fixes that. We wrote up how to tell the difference in Why Your Bermuda Is Yellow Even Though You Fertilized. And if the problem is weeds in thin turf, that's a calendar problem, not a water problem; see when to put down pre-emergent here.

Dave Brandt is the owner of Lemonade Lawn Care, a New Braunfels lawn care company founded in 2017 and voted Best Lawn Care Service in New Braunfels by Herald-Zeitung readers eight years running (2018–2025). Questions about your lawn? Call (830) 730-8022.