How to Grow Signal Grass
Wikimedia Commons
Signal Grass
Brachiaria decumbens
grassSignal grass is a warm-season perennial bunchgrass native to Africa, widely cultivated as a pasture and forage crop in tropical and subtropical regions. It is known for its ability to establish quickly, tolerate poor soil conditions, and provide nutritious livestock feed. The grass produces distinctive signal-like seed heads that give it its common name.
When should you plant Signal Grass in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Signal Grass timeline · Pittsburgh, PA (Zone 6b)
-
Plant Signal Grass
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Signal Grass
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Signal Grass dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in USDA zones 9b-11; performs best in warm climates with temperatures above 50°F year-round
Sign up free to see if Signal Grass grows in your zone — and get a personalized planting timeline.
Get my Signal Grass timeline →Growth Stages
Germination & Seedling
2-3 weeksSeeds germinate in 7-14 days under warm conditions; seedlings develop fine, hair-like leaves characteristic of grasses
Keep soil consistently moist but not waterlogged; maintain temperatures above 60°F; protect from foot traffic; thin crowded seedlings if broadcast sown
Establishment
4-8 weeksYoung plants develop deeper root systems and secondary tillers; foliage gradually fills in coverage; plant height reaches 6-12 inches
Continue regular watering; avoid grazing or cutting during this critical period; allow 6-8 weeks before first harvest; monitor for weeds
Vegetative Growth
8-16 weeksRapid growth phase with extensive leaf and tiller development; plant reaches 18-36 inches tall; dense green foliage provides good ground coverage
Graze or harvest when grass reaches 3-4 feet tall; rotational grazing is recommended; apply nitrogen fertilizer during growing season for improved productivity; remove senescent material
Flowering & Seed Production
3-4 weeksCharacteristic seed heads emerge on stalks; inflorescences are distinctive signal-like racemes; seeds develop over 3-4 weeks
Avoid heavy grazing during flowering; allow seed heads to mature fully before harvest for seed; some operations delay this stage to maintain forage quality
Dormancy/Decline
Variable; may extend 4-6 months in cool wintersIn cooler zones, growth slows dramatically as temperatures drop; foliage may turn brown or yellowish; basal growth continues in warm climates year-round
In subtropical zones, reduce grazing pressure; allow plant to recover; apply winter fertilizer in areas with mild winters; replant if winter damage occurs in marginal zones
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Monitor populations; allow natural predators; consider insecticidal sprays if damage exceeds 20% leaf area; rotate grazing to disrupt life cycles
-
Monitor young growth; early grazing or cutting to remove infested material; encourage parasitoid wasps
-
Generally not economically damaging in established pastures; manage through proper grazing rotations; rarely requires chemical control
-
May occur in sandy soils; plant nematode-tolerant varieties if available; rotate with legumes; maintain soil health with organic matter
-
Maintain good air circulation through proper stocking rates; avoid overgrazing; rotational grazing reduces disease pressure; resistant varieties preferred
Uses
Livestock Forage
CulinarySignal grass is primarily used as high-quality pasture and hay for cattle, sheep, goats, and other livestock. It provides moderate protein content (8-12%) and good digestibility, making it valuable for beef and dairy operations. [source]
Mixed Pasture Blend
CulinarySignal grass is often seeded with legumes (clovers, alfalfa) to improve nitrogen fixation and overall nutritional value of pastures. This symbiotic relationship increases forage quality and reduces fertilizer requirements. [source]
Erosion Control & Soil Stabilization
HouseholdThe extensive root system and quick establishment make Signal grass valuable for controlling soil erosion on slopes and degraded lands. It is used to rehabilitate marginal soils in tropical regions. [source]
Wildlife Habitat
WildlifeSignal grass provides ground cover and food for wild herbivores and birds in its native and introduced ranges. Dense swards create protective habitat for small animals and nesting sites for ground-nesting birds. [source]
Climate Adaptation & Drought Tolerance
HouseholdSignal grass is increasingly used in climate-smart agriculture in tropical Africa, Latin America, and Asia for resilient forage production. Its drought tolerance and low input requirements make it suitable for marginal lands under changing climates. [source]
Harvest Tips
For grazing, allow grass to reach 3-4 feet before introducing livestock; graze to 2-3 inches height; rotational grazing is more productive than continuous grazing. For hay, cut at boot to early heading stage for maximum nutritional value; allow 3-4 week recovery periods between harvests. For seed production, allow plants to reach full maturity, then harvest with a combine when seed heads turn brown; seeds shatter readily when mature.
Fun Facts
- 🌱 Signal grass is native to Africa and has become one of the most important tropical pasture grasses globally, with over 100 million hectares under cultivation in Central and South America alone.
- 🌱 The common name 'Signal grass' comes from the distinctive shape of its seed heads, which resemble hand signals or flags waving in the wind.
- 🌱 Signal grass can produce viable seeds without fertilization and has naturalized in many regions, sometimes becoming invasive in tropical areas where it outcompetes native vegetation.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Signal Grass planting timeline
Tell us your zip code and we'll calculate exactly when to start Signal Grass seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Signal Grass timeline →