Crinum (Crinum thaianum)

Crinum (Crinum thaianum) — also known as the Onion Plant or Water Onion — is a hardy, low-maintenance bulb plant prized for its long, strap-like green leaves that bring graceful vertical structure to the aquarium. Growing from a large bulb, Crinum is extremely tolerant of a wide range of water conditions and is an excellent choice for beginners looking to add height and texture to the back of the tank.

Care at a Glance:

• Light: Low–Medium (tolerates low light well)
• CO₂: Not required
• Placement: Background (can reach 40–60 cm)
• Temperature: 22–28 °C
• Growth Rate: Slow to moderate
• Substrate: Nutrient-rich; bury only the lower third of the bulb
• Difficulty: Beginner-friendly — avoid burying the entire bulb to prevent rot