Alligator-Weed
Alternanthera philoxeroides
Family: Amaranthaceae
Alligator-Weed (Alternanthera philoxeroides) is a upright plant from the Amaranthaceae family.
Complete Care Guide
Light Requirements
Thrives near east-facing windows or a few feet back from south/west windows. Needs consistent but not intense light.
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 6 days (adjust for season and environment).
Humidity
Average household humidity (40-50%) is usually fine. Misting occasionally or grouping with other plants can help during dry winter months.
Temperature
Keep between 60–80°F (16–27°C). Avoid cold drafts, heating vents, and sudden temperature changes.
Size & Growth
Mature size: approximately 41 inches tall × 30 inches wide. Growth rate is moderate. Habit: upright.
Difficulty Level: 2/5
Easy to moderate care. Forgiving of minor mistakes but benefits from consistent attention. Good for beginners ready for a small step up.
Quick Tips
- ✓Water every 7 days
- ✓Prefers medium light
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.
Scorched or bleached leaves
Cause: Too much direct sunlight burning the foliage
Fix: Move away from direct sun. This plant prefers filtered or indirect light.
Drooping or wilting
Cause: Usually underwatering or sudden temperature change
Fix: Water thoroughly and ensure consistent moisture. Avoid cold drafts and heating vents.
Toxic to Pets
Alligator-Weed is toxic to cats and dogs. Ingestion may cause oral irritation, excessive drooling, vomiting, and difficulty swallowing. Keep this plant out of reach or consider a pet-safe alternative.
Browse pet-safe alternatives →Frequently Asked Questions
Is Alligator-Weed safe for cats and dogs?▼
No — Alligator-Weed is toxic to both cats and dogs. If ingested, it may cause oral irritation, drooling, vomiting, or difficulty swallowing. Keep out of reach of pets or choose a pet-safe alternative.
How often should I water Alligator-Weed?▼
Water approximately every 6 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 Alligator-Weed need?▼
Alligator-Weed prefers medium light conditions. Thrives near east-facing windows or a few feet back from south/west windows. Needs consistent but not intense light.
How big does Alligator-Weed get?▼
Indoors, Alligator-Weed typically reaches about 41 inches (104 cm) tall with a spread of around 30 inches. Growth rate is moderate. Size depends on pot size, light, and care.
Is Alligator-Weed good for beginners?▼
Yes! With a difficulty rating of 2/5, Alligator-Weed is very forgiving and suitable for beginners. It tolerates imperfect conditions and bounces back from mistakes.
Similar Plants You Might Like
A Tropical Laural
Persea caerulea
Adam-And-Eve
Arum maculatum
Alocasia Jacklyn
Alocasia jacklyn
Alocasia Maharani
Alocasia maharani