Cryptocoryne ferruginea

Cryptocoryne ferruginea is native to the peat-stained rivers of Borneo (Sarawak and Kalimantan), where it grows in shallow, soft, highly acidic water under dense forest canopy. Its narrow, lance-shaped leaves are mottled with rust-brown, copper, and olive-green tones that give the plant an almost painterly appearance — particularly striking under warm aquarium lighting. It is moderately demanding and performs best in established tanks with soft, acidic water that mirrors its natural blackwater environment.

Light: Low; mottling intensifies under very low, warm-spectrum lighting. CO2: Beneficial; soft acidic water with CO2 produces the richest rust colouration. Substrate: Soft, peat-enriched substrate; root tabs support steady growth. Planting: Expose crown; plant in small groups of 3 to highlight the colour pattern. Growth: Slow; very sensitive to water chemistry changes — maintain stable parameters.