Gulf humidity plus a generous irrigation program is how St. Augustine gets fungus in The Woodlands and Houston. People treat the fungus and leave the 40-minute runtime. The sprinkler is the disease. Shorter, less frequent, and actually dry between cycles beats another fungicide in July.
This guide is written for Texas systems — piney-woods sandy loam over clay in The Woodlands, freeze risk in Houston, watering rules from The Woodlands Water / MUDs. It is not a national blog with the city name swapped in. If the hardware is already failing, skip to timer & controller repairs or call 888-427-5022.
What overwatering and lawn fungus actually looks like on a Texas lawn
Yellow patches that spread in wet weather. Mushrooms in the same arc as a head. A lawn that is soft at 8 a.m. every day. A water bill that looks like a leak but the meter is still when the clock is off.
In The Woodlands the same symptom often traces to low-volume retrofits under trees. In Houston we see more freeze and heave. In League City (City of League City) the program may be legal but the heads are wrong. Do not assume the YouTube fix matches The Woodlands Water / MUDs pressure.
Diagnose before you buy parts
Order of operations matters. Controller and rain sensor first, then the valve box, then heads with water on, then a shovel. Skipping steps is how people replace nozzles when the solenoid is open, or trench for a “root problem” when station 4 is dead at the clock.
- Read the program. Total minutes per week, not what you think it does.
- Check seasonal adjust left at 100% through a wet month.
- Look for low-head drainage that keeps one area soggy after the zone ends.
- Fix leaks and stuck valves before you talk about fungus chemistry.
- Cut runtime, add days off, water at night or dawn, not evening in humidity.
Keep a notepad of zone numbers. The FAQ covers the phone questions we ask so the truck shows up with the right fittings.
Parts that actually last in this climate
A working rain sensor or a Wi-Fi skip that you do not stack. Check-valve heads on slopes. That is the irrigation side. Fungicide is a lawn conversation after the water stops pooling.
We use matched-precipitation nozzles when we change a head, and we flush grit after a pipe cut so the next screen does not pack. Brand-specific notes live in the blog as well — start with Clogged Sprinkler Nozzles, Sunken Sprinkler Heads, Broken PVC Sprinkler Pipe.
What it costs in Texas (ranges, not bait)
A program correction is often part of a repair visit. A sensor, a check valve, or a leak is extra. We will not sell you a treatment plan; we will stop the extra water.
A written quote before work is the rule. See Timer & Controller Repairs for what a typical visit includes, and the full service list if more than one system is involved.
DIY vs calling a licensed irrigator
You can cut the program today. If the lawn is still soggy with the clock off, you have a leak or a stuck valve — not a programming preference.
Texas licenses landscape irrigators for a reason: backflow, buried electric, and municipal rules. If you are in The Woodlands, Houston, or League City, start on the city page — The Woodlands, Houston, League City — then book.
Mistakes that turn a one-hour job into a weekend
- Watering every day “because it’s hot” on clay that cannot take it.
- Evening watering in Houston humidity.
- Ignoring a rain sensor in bypass all summer.
How this ties to other repairs
Dry spots and overwatering can coexist on one zone with unmatched nozzles. Tune coverage first. See dry-spot and rain-sensor articles.
Coverage problems after a “fix” usually mean the program was never updated. Pair mechanical work with controller programming and, on clay, cycle-and-soak — not a longer single runtime.
What a good visit looks like on our trucks
We do not start with a parts cannon. Controller and sensor, then the box, then water-on, then dirt if the lateral is the problem. That order is how you avoid replacing a clock for a cut wire, or trenching a puddle that is eight feet from the break. If you want the short phone version, the FAQ is enough. If you want the long version, you are already in it.
Texas jobs change by metro even when the part number does not. The Woodlands clay hides water. Houston actually freezes brass. League City bills you through a different utility window. A national blog that only swaps the city name is how Google ends up indexing one page. We write the local constraint in the article because it changes the repair.
Bring zone numbers, whether the problem is new or slow, whether anyone dug recently, and whether the meter moves when everything should be off. Those four answers route the call — leak truck vs simple head work vs controller power path. Book on contact or call 888-427-5022.
Frequently asked
How many days a week in Houston summer?
It depends on restrictions and soil. Daily is rarely the right answer on clay. Cycle-and-soak on fewer days beats nightly sips.
Is fungus always overwatering?
No. But irrigation that never lets the canopy dry is the first thing to fix.
Need it fixed, not diagnosed over email? Call 888-427-5022 or use the contact page. Same-day windows are for active leaks and stuck-on valves. Everything else we schedule on emergency vs standard priority.
Texas context we will not skip
Gulf clay, Blackland prairie, and Edwards rock do not share a repair script. A wet spot in Houston is not a freeze crack in Dallas, and a SAWS stage day is not a MUD watering window in Katy. We write those constraints because they change the parts on the truck and the program we leave on the clock.
If this article is about a part, still run isolation before you buy a case of that part. If it is about a city, still open the valve box before you trench the first damp patch. If it is about a clock, still measure the solenoid. That order is the whole business.
Call 888-427-5022. Use the contact page if you need a gate code on the ticket. Hub pages: services, service areas, blog.