Cryptocoryne cordata var. siamensis

Aquarium suitability: yes
Usage: Background, Midground, Specimen plant
Difficulty: easy
Growth: slow
See also: Cryptocoryne cordata var. cordata , Cryptocoryne cordata var. siamensis 'Rosanervig' , Cryptocoryne × purpurea
Range and localities: 

Southernmost part of Thailand (Malaian peninsula) and adjacent north of West Malaysia1

  • Cryptocoryne blassii de Wit
  • Cryptocoryne evae var. evae Rataj
  • Cryptocoryne evae var. recordata Rataj
  • Cryptocoryne siamensis Gagnep.
  • Cryptocoryne siamensis Gagnep. var. ewansii Rataj

Trader names [?]: 
  • Cryptocoryne cordata var. blassii

Misapplied names: 
  • Cryptocoryne × purpurea

Habit, plant type:

  • rosette
Botanical name [?]: Cryptocóryne cordáta Griffith var. siaménsis (Gagnepain) N. Jacobsen & D. Sookchaloem

Major group (unranked): Seed plants: Flowering plants (Angiosperms)
Order: Alismatales
Family: Araceae
Genus: Cryptocoryne


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".

References and further reading:
  1. Bastmeijer, Jan D. & al. (2010): Notes on Cryptocoryne (Araceae) of Thailand, including a new species from Loei Province. - Thai For. Bull. (Bot.) 38: 179–183.
  2. Cryptocoryne cordata var. cordata 'blassii' in the APC Plantfinder (, accessed 08 June 2013)
References (range and localities):
  1. Bastmeijer, Jan D. & al. (2010): Notes on Cryptocoryne (Araceae) of Thailand, including a new species from Loei Province. - Thai For. Bull. (Bot.) 38: 179–183.
Light low to medium 
Temperature tolerance 17 to 30 °C
Optimum temperature 23 to 28 °C
Carbonate hardness 2 to 12 °dKH
pH value 4.5 to 7 
Carbon dioxide (CO2) 10 to 40 mg/l
Nitrate (NO3-) 10 to 50 mg/l
Phosphate (PO43-) 0.1 to 3 mg/l
Potassium (K+) 5 to 30 mg/l
Iron (Fe) 0.01 to 0.5 mg/l

Growth: slow

Propagation: Runners, Rhizomteilung, Splitting, cutting off daughter plants

Can grow emersed?: yes

Suited for outdoor cultivation / ponds: unknown

Winter hardiness: not hardy in Germany

There are no further design information for this plant yet.
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