St. Augustine Grass
Stenotaphrum secundatum
Family: Poaceae
St. Augustine Grass (Stenotaphrum secundatum) is a popular warm-season grass known for its shade tolerance and lush, blue-green blades. It creates a thick carpet that handles foot traffic well.
Complete Care Guide
Light Requirements
Best near south or west-facing windows with sheer curtains. Wants lots of light but not direct sun rays hitting leaves.
Watering
Water when the top 1-2 inches of soil feel dry. Consistent moisture is preferred but brief dry periods are tolerated.
Typical schedule: every 3 days (adjust for season and environment).
Humidity
This plant loves moisture in the air. Keep humidity above 50-60% using a humidifier, pebble tray, or by grouping plants together. Bathrooms with natural light are often ideal.
Temperature
Keep between 60–95°F (16–35°C). Avoid cold drafts, heating vents, and sudden temperature changes.
Size & Growth
Mature size: approximately 6 inches tall × 36 inches wide. Growth rate is fast. Habit: bushy. Stays compact enough for desks and shelves.
Difficulty Level: 3/5
Moderate care requirements. Needs reasonably consistent watering, appropriate light, and attention to humidity. Best for someone with a few plants already.
Quick Tips
- ✓Best shade tolerance of warm-season grasses
- ✓Needs 1 inch of water per week
- ✓Mow to 3-4 inches height
- ✓Spreads by stolons — no seeding needed
- ✓Susceptible to chinch bugs — monitor in summer
Common Problems & Solutions
Brown leaf tips
Cause: Low humidity, inconsistent watering, or mineral buildup from tap water
Fix: Increase humidity with a pebble tray or humidifier. Use filtered water. Water on a consistent schedule.
Pale or leggy growth
Cause: Insufficient light — plant is stretching toward the nearest light source
Fix: Move to a brighter location. Rotate plant quarterly for even growth.
Drooping or wilting
Cause: Usually underwatering or sudden temperature change
Fix: Water thoroughly and ensure consistent moisture. Avoid cold drafts and heating vents.
Crispy leaf edges
Cause: Humidity too low for this tropical plant
Fix: Group plants together, use a humidifier, or place on a pebble tray. Bathrooms often provide ideal humidity.
Pet Safe
St. Augustine Grass is non-toxic and safe for households with cats and dogs. Verified against the ASPCA Toxic and Non-Toxic Plant Database.
Best For
Frequently Asked Questions
Is St. Augustine Grass safe for cats and dogs?▼
Yes! St. Augustine Grass is non-toxic to both cats and dogs according to the ASPCA. Safe to keep in homes with pets.
How often should I water St. Augustine Grass?▼
Water approximately every 3 days, but always check the soil first. Water when the top 1-2 inches of soil feel dry. Consistent moisture is preferred but brief dry periods are tolerated. Adjust frequency based on season — less in winter, more in summer.
How much light does St. Augustine Grass need?▼
St. Augustine Grass prefers bright indirect conditions. Best near south or west-facing windows with sheer curtains. Wants lots of light but not direct sun rays hitting leaves.
How big does St. Augustine Grass get?▼
Indoors, St. Augustine Grass typically reaches about 6 inches (15 cm) tall with a spread of around 36 inches. Growth rate is fast. Size depends on pot size, light, and care.
Is St. Augustine Grass good for beginners?▼
St. Augustine Grass has a difficulty rating of 3/5, so it's best for intermediate plant parents. It needs more specific conditions to thrive.
Similar Plants You Might Like
Polka Dot Plant
Hypoestes phyllostachya
Tall Fescue
Festuca arundinacea
Cat Grass
Dactylis glomerata
Oxalis Triangularis
Oxalis triangularis