Hygrophila siamensis

Under water the leaves are light-green and dense. In open aquariums Hygrophila corymbosa 'Siamensis' grows easily above the water surface, where it forms blue-green leaves and small blue flowers. It grows fast and the shoots must be pinched out regularly if you want to keep the plant under water. An extremely hardy plant, suitable for beginners.

• Height: 15-40 cm
• Width: 15-20 cm
• Light: requirements low-very high
• Temperature: 20-28 °C
• Hardness tolerance: very soft-hard
• pH tolerance: 5.5-8
• Growth: fast
• Demands: easy

Hygrophilla  siamensis (family Acanthaceae) has light green coloured leaves when  grown in the aquarium. The internodes also shorten making the plant  more compact .This is probably a variety of corymbosa. Grown emersed the  plants leaves turn a dark almost blue green colour. These plants also  send out many light blue flowers in winter when it is grown out of water.  It propagates easily from cuttings and besides good lighting does not  need any special requirements.

Habitat

This is an aquatic emergent plant. It has very high moisture needs; suitable for bogs and water gardens. The plant naturally grows as an emergent, but it can survive long periods fully submerged.