One of the most popular stem plants, Hygrophila Polysperma (sold frequently as “Blue Stricta”) grows large, pointed bright green leaves with silvery undersides. A cluster of these stems in the midground of your aquarium will quickly grow to create a lush green bush.
Hygrophila Polysperma is exceptionally easy to grow, requiring only low to moderate lighting and fertilisation to thrive. CO2 injection is not required with this plant, making it an excellent choice for low tech aquariums.
Few aquatic plant species are as tough or as accommodating as this one. Light intensity seems to be rather unimportant, though lower light values will result in proportionately slower and more diminutive growth. Fertilization, as well, seems to be of limited significance in the maintenance of this species. Its stems will tolerate a variety of hardness values without showing a noteworthy decline in their exceptionally quick growth. CO2 supplementation is definitely not a necessity for this species, and it can be grown in non-CO2 aquaria without problems. In this light, it is a recommendable beginnerï¿½s plant.
Since H. polysperma develops a multitude of lateral shoots at its leaf nodes, propagation is a simple matter of removing these and replanting them. An aquarist might also ï¿½topï¿½ the stems by removing and discarding all of the shoot apexes that rise above a given level in the aquarium; new growth will shortly materialize. The growth of this species is often so rapid that a trim of some sort is required within two or three weeks of the last pruning.
A group of stems of H. polysperma is best suited to the midground area of the aquarium, where they will add an interesting geometry to the aquascape. They are of limited contrast value, making them excellent 'filler' plants in stem plant dominated layouts. Although most hobbyists discount the decorative value of this species, Takashi Amano frequently uses this plant in his layouts.