The Thalia dealbata is an aquatic plant that can grow up to 6ft in height. A panicle above the foliage supports its small violet flowers, and its blue-green leaves have attractive purple edges. It is a truly dramatic plant that will add height and colour to your pond. This plant is half-hardy but it should grow without any trouble in the southern regions of England. In colder parts of the UK it might lose its foliage during winter, although it can be overwintered in a greenhouse.
Caring and Maintenance
If you live outside of the south of England it may be too cold in your garden to leave this plant outside all year around. It could lose some foliage and become deciduous. If there is a particularly sudden and cold winter snap then it is advisable to move the plant into a greenhouse until the frosts have passed. Propagate by division in spring.