Barclaya longifolia Green

Barclaya longifolia is a member of the Nymphaeaceae family native to slow-moving tropical streams and forest pools across Myanmar, Thailand, and India, where it grows in warm, soft, acidic water under shaded canopy. The green form produces long, strap-like leaves in olive-green to bronze-green with strongly undulating, ruffled margins and prominent ribbing, all emerging from a central compact rhizome. The plant resembles a cross between an Aponogeton and a water lily in habit, and its flowers — rarely seen in aquarium conditions — are self-pollinating and cleistogamous, never fully opening.

In the aquarium, Barclaya longifolia demands warm, soft, slightly acidic water and moderate shaded lighting — it does not tolerate hard, alkaline conditions or strong, direct light well. It is a plant for the intermediate to advanced aquarist who can provide and maintain the specific conditions it requires. When well grown it is one of the most elegant and distinctive aquatic plants available, and a centrepiece specimen in any serious planted tank.

Avoid disturbing the rhizome once established, and plant in a nutrient-rich substrate. Root tabs placed nearby provide essential nutrition without causing nutrient spikes that can stress the plant.

Light: Medium and diffused (30–60 PAR); strong direct light causes leaf bleaching. CO2: Beneficial; maintains strong leaf production and prevents leaf melt in the transition period. Fertilisation: Root tabs every 8–10 weeks near the rhizome; avoid high-nitrate dosing — use low-concentration liquid fertiliser. Placement: Midground or background as a solitary specimen; do not disturb rhizome once settled. Propagation: Division of the rhizome when side shoots develop; seeds occasionally form by cleistogamous self-pollination.