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The Long-leaf Barclaya is a classical aquarium plant, however it has become quite rare in the hobby in recent years. This magnificent underwater plant belongs to the Waterlily family (Nymphaeaceae) and is native to Southeast Asia where it occurs in clear streams with soft, acid water. Its elongate, almost arrow-shaped, wavy, soft leaves get more than 30 cm long and sit in a rosette on a tuber or rhizome. An olive-green and a red form are available in the trade; the leaf underside of both forms is a mauve colour.
Medium lighting is sufficient for Barclaya longifolia; it grows best with nutrient-rich bottom (e.g. a type of Aquasoil or gravel with a little loam), soft to medium hard water and higher temperatures (optimum: 25-28 °C, tolerance range: 18-30 °C). The delicate leaves are prone to damage by snails. This plant is primarily propagated by sowing; it also develops fruits with seeds when the flowers remain below the water surface. After periods of lush growth and flowering the plant may decline in growth for several weeks; during this time it should not be replanted.
Barclaya longifolia looks pretty in not too small tanks, as solitary plant or small group in the midground or background. With its elongate, wavy leaves, it resembles certain larger Cryptocoryne species.