‘Siamensis’ originates from Thailand and have stems from 15-40 cm and 10-15 cm wide. 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.
When planting this plant in the substrate try using 2 or 3 rocks to surround the stem, this will highlight the plant and help bring out the colour.