Range and localities [?]: Southernmost part of Thailand (Malaian peninsula) and adjacent north of West Malaysia1
Cryptocoryne cordata var. blassii originates from swamplands in southern Thailand, Malaysia and on the island of Borneo. It is the most popular variety of C. cordata and very easy in cultivation.
This Cryptocoryne is an undemanding slow grower. It needs low to medium light (0.25-0.5 watts per litre), as its natural habitat is in shaded rivers. It does not require additional CO2, however, CO2 fertilisation may have a positive effect on growth. It can be kept in hard water very well. In order to reach its full height it needs a substrate rich in nutrients.
The emersed cultivation of C. cordata var. blassii is easy. It only needs low light and should be sprayed with water from time to time in order to increase the humidity. It also needs a nutrient-rich substrate when cultivated above the waterline.
In the aquarium, this plant can reach a height of about 20 cm in time, given that it grows in a nutrient-rich substrate. Cut off yellowish or decomposing leaves with a sharp pair of scissors.
Its singular leaf form and greenish red coloured leaves as well as the dark red leaf undersides make it an excellent choice for the middleground of an aquarium. In Dutch aquaria this plant lends itself to making "streets".
This Cryptocoryne is undemanding, but also slow-growing. Low to medium light intensity (0.25-0.5 watts per litre) is recommended, since it is found in shady rivers in its natural habitat. CO2 supply is not necessary, but can have a positive influence on growth. This species can also still be kept very well in hard water. To reach its full size, a nutrient-rich substrate should be present.
This plant can reach a height of approx. 20 cm in the aquarium, which is achieved with a nutrient-rich substrate and sufficient time. Yellowish or disintegrating leaves can be cut off with sharp scissors.
C. cordata var. siamensis can be kept emersed very easily. It must receive only low light and should occasionally be sprayed with water to increase the humidity. The substrate should be nutrient-rich.
References and further reading:With its distinctive leaf shape and greenish-red leaf colouration with deep red leaf undersides, Cryptocoryne cordata var. siamensis is a good choice for the midground. In planted aquariums in the Dutch style, this Cryptocoryne can also be used for "plant streets".
References and further reading:
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