Equisetum japonicum - Barred horsetail

This waterplant is well suited to gardens with ponds. Although the plant can be planted outside of ponds as well, the plant can proliferate outside, potentially overrunning your garden. Equisetum japonicum has a water-filtering function, which keeps ponds 'healthy'.

Equisetum looks like green bamboo shoots sticking out of the water. It is a quite decorative plant for your pond.