Eriocaulon Cinereum polaris (InVitro) Aquarium plant from tissue culture in closed cup. The genus Eriocaulon is usually adapted to soft water. Eriocaulon cinereum is more tolerant than most and will thrive in medium-hard water.  Soft water will promote overall health. This is a quite small, very narrow-leaved and almost cushion-growing plant, that demands good supply of light and CO2 to develop. The plant usually flowers very willingly after planting in the aquarium and the numerous flower stems give a unique appearance. Flowering easily drains the energy of the plant, but given the right conditions, it will gather new energy and grow from basis after some time. Plant info Type: Rosulate   Origin: Cosmopolitan Country or continent where a plant is the most common. Cultivars arise or are bred in cultivation. Growth rate: Slow Growth rate of the plant compared to other aquatic plants. Height: 3 - 10+ Average height (cm) of the plant after two months in the tank. Light demand: High The average or medium light demand of an aquarium plant is 0,5 W/L. CO2 : High A medium need in CO2 is 6-14 mg/L. A high demand in CO2 is approx. 15-25 mg/L.