Texas Sod & Drainage Pros

Comprehensive Guide to St. Augustine Grass

St. Augustine grass, with its dense mat of lush, vibrant green blades, is the crown jewel of many southern landscapes. Renowned for its ability to flourish in warm climates, this grass variety paints neighborhoods from Florida to California in shades of emerald. However, the beauty of St. Augustine grass is not without its demands. Proper care and maintenance are essential to keep this turf at its best.


A Seasonal Care Guide

01. Spring

As winter recedes, St. Augustine grass awakens. This period demands early preparation to ensure a lush, healthy lawn. Begin with a pre-green up mow, setting your mower to about 2 inches. This helps remove dead grass and prevents thatch buildup. Transition to regular mowing, keeping the grass about 2 1/2 inches tall, to encourage dense growth without stressing the turf​​.

Fertilization is crucial, but timing is key. Wait until the threat of frost has passed to encourage healthy growth without risking frost damage. Soil testing can guide your fertilization strategy, ensuring your grass gets precisely what it needs. Weed control starts now, with pre-emergent herbicides applied early in the season, followed by post-emergent treatments as needed​​.

Spring’s natural rainfall often suffices, but irrigation may be necessary during drier spells. Aim for deep, infrequent watering to encourage robust root development, setting the stage for a resilient lawn as temperatures rise​​.

02. Summer Care

St. Augustine thrives in the heat, necessitating frequent mowing to maintain a height of 3-4 inches. This height protects against weeds and drought stress. The lawn will require more frequent cuts during this vigorous growth period, especially in warmer climates where it remains active year-round​​.

Irrigation becomes more critical as the mercury climbs. St. Augustine prefers to dry slightly between watering sessions, promoting healthy root systems. Water deeply, ensuring the top 6 inches of soil are moistened, to cover the entire root zone​​.

Fertilize with a balanced approach, providing 2 to 4 pounds of nitrogen per 1,000 square feet annually, split over multiple applications. Late summer is the time for potassium-rich fertilizers to prepare the grass for cooler months, though phosphorus should only be added if a deficiency is identified​​.

03. Fall and Winter

Reduce watering as St. Augustine enters dormancy in cooler parts of its range. This is also the time to scale back on fertilization, allowing the grass to harden off in preparation for colder weather. Aeration and dethatching, if needed, should be completed in early fall to minimize stress on the lawn​​.

Year-Round Vigilance

01. Aeration and Dethatching

One of the secrets to a thriving St. Augustine lawn is ensuring the soil and grass roots get ample air and water. Aerating the soil every couple of years prevents compaction, a common issue with this grass type due to its dense growth. Use a core aerator rather than a spike aerator to avoid further compacting the soil​​.

Dethatching is equally crucial. A thatch layer thicker than ½ inch can block moisture, nutrients, and air from reaching the soil, stifling your lawn’s health. Use a manual dethatching rake for this task to minimize damage to the grass’s vital stolons​​.

02. Irrigation

St. Augustine’s water needs are nuanced. While it requires consistent moisture, overwatering can be detrimental. The goal is to let the lawn dry out slightly between waterings, promoting deeper root growth and drought tolerance. Aim to saturate the top 6 inches of soil, ensuring the entire root system receives moisture​​.

03. Fertilization

Proper nutrition is paramount for St. Augustine’s health and color. Apply 2 to 4 pounds of nitrogen per 1,000 square feet annually, distributed over several feedings. Potassium is crucial in late summer to fortify the grass against cooler temperatures, while phosphorus should only be used when necessary​​.

04. Mowing

St. Augustine grass thrives when kept longer than many other grass types, especially in shaded areas or during extreme heat or drought. This longer blade length helps protect the roots and maintain moisture. Adjust your mowing height seasonally, keeping blades between 2 to 4 inches tall​​.

Advantage of St. Augustine

St. Augustine grass stands out for its lush appearance and shade tolerance but requires more maintenance and water than Bermuda or Zoysia grass. It’s less wear-tolerant, making it less suitable for high-traffic areas. However, its aesthetic appeal, particularly the tropical vibe of its wider blades, makes it a beloved choice for many homeowners​​​​.

Bermuda grass, with its aggressive growth and fine texture, is ideal for sports fields and golf courses. Zoysia, offering drought resistance and adaptability to various climates, presents a lower-maintenance alternative with a manicured look​​​​.

Choosing St. Augustine grass is a commitment to both its beauty and its demands. With regular care, it rewards homeowners with a thick, vibrant lawn that’s a testament to the life and color of warmer regions. Its care routine—mowing, watering, fertilizing, and pest management—may be intensive, but the results are a lush, inviting outdoor space.


Mastering St. Augustine grass care is an art that blends science with dedication. From the right mowing height to precise watering, every aspect of care is geared towards nurturing its thick, carpet-like spread. While challenges like pests and diseases loom, proactive and informed care can keep these issues at bay, ensuring your St. Augustine lawn remains a luxuriant, green oasis year-round.

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