St. Augustine Grass Care in Spring TX: How to Keep It Healthy in Summer Heat
If you own a home in Spring, TX, there is a good chance your lawn is St. Augustine grass. It is the most widely planted turf grass in the Houston area because it handles the local climate better than most alternatives: it tolerates heat, establishes in shade that kills Bermuda, and produces the lush, thick canopy most homeowners want. But it has specific care requirements, and getting those wrong is the most common reason St. Augustine lawns thin out, turn yellow, or develop disease problems over time.
At Exo Services, St. Augustine grass care is a core part of our lawn care services in Spring TX. Here is exactly what this grass needs through the year.
Why St. Augustine Thrives in Texas
St. Augustine (Stenotaphrum secundatum) is a warm-season grass native to the Gulf Coast and Caribbean, which tells you a lot about why it works in Houston. It is built for heat and humidity. It goes dormant in cold weather but recovers aggressively when temperatures rise. It is one of the few lawn grasses that tolerates partial shade, making it viable under tree canopies and in north-facing areas where other grasses fail.
The most common variety in the Spring TX area is Raleigh St. Augustine, which is the most cold-hardy cultivar and handles the occasional hard freezes this area sees. Floratam is also common and has better chinch bug resistance, though it is less shade-tolerant and more cold-sensitive than Raleigh.
What makes St. Augustine demanding to care for is that it does not tolerate neglect in the same forgiving way that Bermuda does. It is more sensitive to improper mowing, certain herbicides, overwatering-related diseases, and chinch bug pressure. Managed correctly, it is excellent. Managed incorrectly, it declines steadily.
Watering St. Augustine in Spring TX
St. Augustine is a moderately water-intensive grass compared to Bermuda or Zoysia. During active summer growth, it needs approximately one inch of water per week. In peak heat, that can climb to one and a half inches.
The key variables are timing and depth, not just volume.
Timing: Water in the early morning, between 5 and 7 AM. This gives the blades time to dry as temperatures rise during the day, which is critical for preventing fungal diseases like brown patch. St. Augustine lawns watered in the evening or overnight are significantly more prone to fungal issues, which are the most common reason St. Augustine lawns in this area develop circular brown patches.
Depth: Infrequent, deep watering is better than frequent, shallow watering. Watering deeply two to three times per week encourages roots to grow downward, which produces more drought-tolerant turf. Daily light watering keeps roots shallow and creates grass that needs watering more and more frequently to avoid wilting.
Watch for wilt signals. St. Augustine shows drought stress by folding its leaf blades lengthwise and developing a blue-gray color before turning brown. This folding is an early warning sign. A lawn showing folded blades in the morning, before heat builds, needs water. A lawn that folds briefly in mid-afternoon and recovers by evening is likely adequately watered and just responding to heat stress.
Mowing Height and Schedule for St. Augustine
St. Augustine should be mowed at three and a half to four inches in the Houston area during summer. This is higher than most homeowners instinctively cut it, but the taller canopy is functional: it shades the soil surface, which reduces soil temperature and moisture evaporation at the root zone.
Scalping St. Augustine (cutting it down to an inch or less) during summer is one of the fastest ways to damage it. Short blades lose their self-shading ability, root zones overheat, and the grass struggles to photosynthesize enough energy to maintain itself during peak heat.
Mow frequently enough that you are never removing more than one-third of the blade height in a single cut. During the fast-growing weeks of May and June, that may mean mowing every five to six days. During the slower weeks of August and September, every eight to ten days is typically sufficient.
Keep mower blades sharp. Dull blades tear the grass rather than cutting it cleanly, which creates ragged edges that brown and create entry points for disease.
Fertilization and Weed Control for St. Augustine
St. Augustine has specific fertilization needs and does not tolerate every herbicide product on the market.
Fertilization schedule: Feed St. Augustine lawns in spring (late March to April) when green-up is underway, again in early June, and a final time in early September. Avoid late-season nitrogen applications after September, which push soft growth that is vulnerable to cold damage. Use a fertilizer formulated for St. Augustine with a nitrogen source appropriate for the season. Slow-release formulas are preferable for spring and summer to avoid pushing excessive top growth at the expense of root development.
Iron supplementation: St. Augustine is prone to iron chlorosis (yellowing between leaf veins while the veins stay green) in alkaline soil. The Houston area has naturally alkaline clay soils. Iron supplement applications, typically chelated iron sprays, address this yellowing without nitrogen overload. If your St. Augustine is yellowing despite adequate fertilization, iron deficiency is the most likely explanation.
Herbicide caution: This is critical. St. Augustine is sensitive to atrazine (which it tolerates) but is damaged or killed by several other common herbicides including many broadleaf weed killers that contain dicamba or 2,4-D at incorrect rates. Always verify that any herbicide product is labeled safe for St. Augustine before applying. Read the label, not just the front of the package.
For a complete fertilization program appropriate for St. Augustine in the Spring TX area, a professional assessment ensures you are applying the right products at the right times for your specific soil and grass condition.
When to Call a Pro for Your St. Augustine Lawn
Some St. Augustine issues are straightforward to address with the right product and timing. Others signal problems that require professional diagnosis to avoid making worse.
Call a professional when you see: circular brown patches that are expanding (likely brown patch fungal disease, which is very common in Houston area St. Augustine and treatable with fungicides but not herbicides), widespread yellowing that does not respond to fertilization (may be nematodes in addition to iron deficiency), chinch bug damage in sunny exposed areas during summer (requires specific insecticide application), or thinning that does not improve despite good watering and fertilization (may indicate soil pH, compaction, or nematode issues requiring testing).
St. Augustine is a resilient grass when it is managed correctly. When it starts declining, diagnosing the right cause before treating it is the difference between a solution and a setback.
Professional St. Augustine Care from Exo Services
Exo Services handles full St. Augustine lawn maintenance programs for residential and commercial properties in Spring TX. From fertilization timing and mowing schedules to pest management and disease response, we keep St. Augustine lawns in the condition this grass is capable of when it is managed properly.
Contact us to schedule a lawn assessment or call (832) 819-4442. We will look at what your St. Augustine needs right now and put a plan together that makes sense for your property.