How To Plant St Augustine Grass Runners – Step-By-Step Guide With Tips
To successfully plant St. Augustine grass runners, first prepare your soil by clearing weeds, loosening the topsoil, and ensuring good drainage. Source healthy runners, then lay them out in rows, burying the nodes (joints) every 6-12 inches while leaving the leaves exposed. Firm the soil around each buried section and water thoroughly immediately after planting, maintaining consistent moisture until establishment.
This method leverages the grass’s natural spreading ability to fill in bare areas or establish a new lawn efficiently, often more cost-effectively than sod and with faster coverage than seed.
Dreaming of a thick, emerald-green lawn that can withstand the scorching summer sun? St. Augustine grass is a beloved choice for warm-season climates, renowned for its lush appearance and resilience.
However, getting it established can sometimes feel like a puzzle, especially when you’re dealing with sparse patches or starting a new area.
This comprehensive guide will show you exactly how to plant St. Augustine grass runners, transforming bare ground into a vibrant, healthy turf. We’ll cover everything from preparation to post-planting care, ensuring your efforts lead to a thriving lawn.
Understanding St. Augustine Grass Runners: Your Lawn’s Natural Spreader
St. Augustine grass (Stenotaphrum secundatum) is a warm-season turfgrass celebrated for its coarse texture, blue-green color, and remarkable ability to thrive in hot, humid conditions. It’s a popular choice across the southern United States.
Unlike some grasses that spread primarily through underground rhizomes, St. Augustine relies heavily on its above-ground runners, also known as stolons.
What Makes St. Augustine Grass Unique?
This turfgrass forms a dense, carpet-like lawn, effectively outcompeting many weeds once established. It boasts good shade tolerance compared to other warm-season varieties like Bermuda grass, making it versatile for various landscape designs.
Its robust nature and beautiful appearance make it a homeowner favorite.
The Anatomy of a Runner (Stolon)
A St. Augustine runner is a horizontal stem that creeps along the soil surface. At various points along the runner, you’ll find “nodes” or joints.
These nodes are crucial because they contain the meristematic tissue capable of producing new roots and shoots. When these nodes make contact with moist soil, they root down, and new grass blades emerge, allowing the plant to spread rapidly.
Why Choose Runners Over Seed or Sod?
While St. Augustine grass can be planted as sod or, less commonly, from seed, runners offer a unique set of advantages. Planting runners is often more economical than laying sod, especially for larger areas, as you can often source them from an existing healthy lawn.
Runners also establish quickly, providing faster coverage than seeding, which is rarely successful with St. Augustine due to poor germination rates and seed viability.
Essential Preparations Before Planting
Success in gardening, especially with lawn establishment, is built on thorough preparation. Taking the time to prepare your site correctly will significantly improve the chances of your St. Augustine runners taking root and thriving.
Assessing Your Site: Sun, Soil, and Drainage
Before you even think about how to plant St. Augustine grass runners, evaluate your chosen location. St. Augustine grass prefers full sun (6-8 hours daily) but can tolerate partial shade (4-5 hours).
Good drainage is paramount; St. Augustine dislikes soggy conditions, which can lead to root rot and fungal diseases. Observe how water drains after a rain or manual watering.
Soil Testing and Amendment
A soil test is your best friend. It reveals your soil’s pH and nutrient deficiencies. St. Augustine grass prefers a slightly acidic to neutral pH, typically between 6.0 and 7.5.
Based on test results, amend your soil. If it’s too acidic, add lime. If too alkaline, incorporate elemental sulfur. For poor drainage or heavy clay, mix in organic matter like compost or aged manure to improve soil structure.
Clearing the Area: Weed Control and Debris Removal
Begin by removing all existing weeds, grass, and debris from the planting site. This is critical to prevent competition for water and nutrients.
You can achieve this through manual removal, solarization, or using a non-selective herbicide like glyphosate (always follow product instructions carefully, including wearing gloves and eye protection).
Once cleared, lightly till or loosen the top 4-6 inches of soil to create a hospitable environment for new roots.
Gathering Your Tools and Materials
Having everything ready before you start makes the planting process smooth and efficient. Here’s what you’ll need:
- Shovel or garden fork for soil preparation
- Rake for leveling
- Sharp utility knife or shears for cutting runners
- Garden hose or sprinkler for watering
- Gloves for protection
- St. Augustine grass runners
- Optional: Starter fertilizer (low nitrogen, high phosphorus)
The Step-by-Step Guide: How to Plant St. Augustine Grass Runners
Now that your site is prepped and your tools are ready, it’s time for the main event. Follow these steps carefully to ensure your St. Augustine grass runners establish successfully.
Sourcing and Preparing Your Runners
You can obtain runners from an existing healthy St. Augustine lawn, either your own or a neighbor’s with permission. Look for thick, vigorous runners that have several nodes.
Using a sharp utility knife or shears, cut sections of runners that are 12-18 inches long, ensuring each section has at least 3-4 healthy nodes. Keep the runners moist and out of direct sun until planting to prevent desiccation.
Laying Out Your Runners Strategically
This is where understanding how to plant St. Augustine grass runners truly comes into play. Lay the prepared runners directly onto the loosened soil surface in parallel rows. The spacing between rows depends on how quickly you want coverage.
For faster establishment, space rows 6-12 inches apart. If you have fewer runners or are patient, you can space them up to 18-24 inches apart. Ensure the runners are aligned with the natural slope of the land if possible, to aid in water distribution.
Securing and Burying the Nodes
Once laid out, gently press the runners into the soil. The critical step here is to ensure the nodes make good contact with the soil. You don’t need to bury the entire runner.
Instead, bury every 6-12 inches of the runner, focusing on covering the nodes. You can use a small amount of soil to create a slight mound over each node, or simply press them firmly into the loosened soil.
Leave the leafy parts of the runner exposed to sunlight. This allows photosynthesis to continue, powering the new root and shoot growth.
Initial Watering and Firming
Immediately after planting, water the entire area thoroughly. The goal is to moisten the soil deeply (at least 4-6 inches) to encourage root development. Use a gentle stream to avoid dislodging the newly placed runners.
After watering, you can gently walk over the planted area or use a roller to firm the soil around the runners. This eliminates air pockets and ensures excellent soil-to-runner contact, which is vital for rooting.
Nurturing Your Newly Planted Runners to Success
Planting is just the first step. The critical period for establishment is the first few weeks and months. Proper care during this time will determine the long-term health and density of your St. Augustine lawn.
Critical Watering Schedule
Consistent moisture is key for new runners. For the first 2-3 weeks, water lightly once or twice a day, ensuring the top 1-2 inches of soil remain consistently moist. Avoid overwatering, which can lead to fungal issues.
As the runners begin to root (you’ll notice new green growth and resistance when gently tugged), gradually reduce the frequency of watering but increase the duration. Aim for deep, infrequent watering to encourage deep root growth.
First Fertilization: NPK Ratios Explained
About 3-4 weeks after planting, once you see active new growth, you can apply a starter fertilizer. Look for a blend with a low first number (nitrogen) and higher middle number (phosphorus), such as an 8-16-8 or 5-10-15 NPK ratio.
Phosphorus promotes strong root development. Always follow the manufacturer’s application rates precisely to avoid burning the delicate new grass.
Weed Management Post-Planting
New lawns are vulnerable to weed competition. Avoid using pre-emergent herbicides on newly planted runners, as they can inhibit rooting. Instead, hand-pull any weeds that emerge.
Once your St. Augustine grass is well-established (usually after 2-3 months), you can consider using selective post-emergent herbicides labeled safe for St. Augustine, but always spot-treat if possible.
Mowing Your Emerging Lawn
Hold off on mowing until the runners are firmly rooted and show significant new growth, typically 4-6 weeks after planting. When you do mow, set your mower blades to the highest setting, ideally 3-4 inches.
St. Augustine grass thrives when mowed tall, as this encourages deeper roots and shades out weeds. Ensure your mower blades are sharp to make clean cuts and prevent tearing the grass.
Troubleshooting Common Challenges
Even with the best intentions, you might encounter a few hiccups. Knowing how to address them can save your lawn and your peace of mind.
Runners Not Rooting?
If your runners aren’t rooting, re-check soil contact. Air pockets are common culprits. Ensure nodes are firmly pressed into the soil. Insufficient watering or inconsistent moisture can also prevent rooting. Lastly, a soil test might reveal nutrient deficiencies or an unsuitable pH hindering growth.
Pest and Disease Prevention
Newly established St. Augustine grass can be susceptible to pests like chinch bugs or diseases such as brown patch. Healthy soil, proper watering, and good air circulation are your best defenses. If you spot issues, identify them quickly and use targeted, environmentally friendly treatments where possible.
Always avoid broad-spectrum pesticides that harm beneficial insects.
Dealing With Bare Spots
Despite your best efforts, some bare spots might remain. Don’t despair! St. Augustine’s aggressive spreading nature means it can often fill in minor gaps over time.
For larger bare areas, you can repeat the process of how to plant St. Augustine grass runners, placing new sections into the empty patches. Ensure adequate moisture and sunlight for these new additions.
Expert Tips for a Thriving St. Augustine Lawn
Beyond the initial planting, long-term care is what truly sets apart a good lawn from a great one. Incorporate these expert tips into your routine for a perpetually lush St. Augustine lawn.
Seasonal Care Calendar
Tailor your lawn care to the seasons. In spring, apply a balanced fertilizer to kickstart growth. Summer demands vigilant watering and higher mowing heights. In fall, apply a “winterizer” fertilizer (higher potassium) to prepare for dormancy and reduce watering frequency.
Avoid heavy fertilization in late fall, which can stimulate tender growth susceptible to frost damage.
Cultivar Considerations (E.g., Floratam, Palmetto)
Not all St. Augustine grass is the same. Cultivars like Floratam are known for excellent heat and insect resistance but are not cold-tolerant. Palmetto offers better cold tolerance and shade performance.
Choosing the right cultivar for your specific climate and site conditions makes a huge difference in long-term success.
Aeration and Dethatching Benefits
Over time, St. Augustine can develop a thick layer of thatch – a build-up of organic material between the soil surface and the green grass blades. Thatch can prevent water and nutrients from reaching the roots.
Dethatch every 1-2 years if the thatch layer exceeds ½ inch. Core aeration, punching small holes in the soil, improves air and water penetration, especially beneficial for compacted soils.
Frequently Asked Questions About St. Augustine Grass Runners
When Is the Best Time to Plant St. Augustine Grass Runners?
The ideal time to plant St. Augustine grass runners is during the warm growing season, typically late spring through early summer, when soil temperatures are consistently above 65°F (18°C). This allows the runners ample time to establish before cooler weather arrives.
How Long Does It Take for St. Augustine Runners to Establish?
You should see initial rooting and new growth within 2-4 weeks. Full establishment, where the runners have spread significantly and formed a dense turf, can take anywhere from 2-4 months, depending on conditions and initial spacing.
Can I Plant St. Augustine Runners in Sandy Soil?
Yes, St. Augustine grass generally tolerates sandy soils well, which are common in many warm-season regions. However, sandy soils often require more frequent watering and may benefit from incorporating organic matter to improve nutrient retention.
What’s the Ideal Soil pH for St. Augustine Grass?
St. Augustine grass prefers a soil pH range of 6.0 to 7.5, which is slightly acidic to neutral. A soil test will confirm your current pH and guide you on necessary amendments.
How Often Should I Fertilize St. Augustine After Establishment?
Once established, fertilize St. Augustine grass 2-4 times a year, typically in spring, early summer, and fall. Adjust frequency based on soil test results, grass appearance, and specific cultivar needs. Always use a fertilizer formulated for warm-season grasses.
Conclusion: Your Path to a Beautiful, Resilient St. Augustine Lawn
Mastering how to plant St. Augustine grass runners is a rewarding skill that empowers you to create and maintain a stunning, resilient lawn. By understanding the biology of this unique grass, preparing your site meticulously, and providing consistent care, you’re setting yourself up for success.
Remember, patience and observation are your greatest tools in gardening. Watch your runners grow, adapt your care as needed, and soon you’ll be enjoying the lush, green beauty of a thriving St. Augustine lawn. Happy planting!
Taylor pairs an engineer's eye with years of hands-on work in soil, lawns and outdoor machinery. He tests ideas in his own garden, keeps tractors and mowers running himself, and speaks to local horticulture groups. Every Garden Aider guide is written to be practical, accurate and safe to follow.
“To bring life alive, you just need to mix some love with the compost, bedding, and gardening machines.”