Crinum Thaianum (Crinum thaianum) Care Guide

Bulb plant with very long ribbon-like leaves up to 1.5 m; an iconic background specimen for tall tanks.

Overview

Crinum thaianum is an aquatic plant in the family Amaryllidaceae. Bulb plant with very long ribbon-like leaves up to 1.5 m; an iconic background specimen for tall tanks.

Taxonomy

• Family: Amaryllidaceae
• Genus: Crinum
• Scientific name: Crinum thaianum
• Other names: Onion Plant, Thai Onion Plant

Habitat

Endemic to the coastal plain of Ranong and Phang Nga Provinces in Thailand, where it grows in flowing streams with submerged bulbs and trailing ribbon-like leaves up to 150 cm long. Listed as Endangered on the IUCN Red List.

Growth requirements

• Light: medium (≈50-80 PAR at substrate)
• CO2: optional (CO2 improves growth and coloration)
• Temperature: 22-28 °C
• pH: 6-7.5
• GH: 4-16 °dGH
• Substrate: nutrient-rich aquasoil or fertilised gravel
• Nutrient demand: medium
• Growth rate: slow
• Difficulty: beginner

Placement

• Recommended placement: background
• Maximum height: 150 cm

Propagation

Propagated vegetatively in cultivation; specific method depends on the morphological group of the plant.