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The Siamese water trumpet is a variety of Cryptocoryne cordata from southern Thailand. It occurs predominantly in calcareous, shaded flowing waters, in contrast to typical Cryptocoryne cordata which is found in rather acid, soft waters of the Malayan peninsula. There are different forms of the variety siamensis, for example "Cryptocoryne blassii". They are long known as undemanding aquarium plants, however they have become rare in the aquarium hobby.
The siamensis form offered by us (Dennerle short name C30) is propagated by meristem culture and has narrow, lanceolate leaves with an attractive pattern of dark veins and a reddish underside. It is slow growing, can be kept in hard to soft water and has a low light demand. For a long time the plant does not exceed a height of 20 cm and is suited for the midground. However, after a long period of growth it may get taller, especially with low light and ample nutrient supply. With time, it forms a lush, dense stand by underground runners.
When Cryptocoryne cordata var. siamensis is grown in shallow water or emersed, one can expect its attractive inflorescences with yellow spathe.