Sagittaria subulata from South America is an ideal, undemanding foreground plant whose short runners form a compact group. Place individual plants 2-4 cm apart. This plant may cause problems because in certain conditions it suddenly grows to a height of 50 cm when it grows older. But if it is then moved into the background it may become low again. In the aquarium it sometimes sends a long flower stem to the surface, and small white flowers unfold just above the water surface.