Tsi, Houttuynia cordata
This plant likes to grow in wet soils and shallow water. Some plants catalogues also sell it as a plant for moist soils in shade.
Tender young shoots and leaves are eaten raw or cooked as a pot-herb.
The leaves and young shoots are harvested in the spring when about 8cm long. Strongly aromatic according to one report whilst others say that it is rather smelly and somewhat like rotten fish. Our experience is that the leaves have a delicious orange-like smell and make a marvellous flavouring in salads.
One report says that there are two distinct chemotypes of this species. Plants from Japan have an orange scent, whilst those from China have a smell resembling coriander leaves (Coriandrum sativum). Some people seem to really like this leaf, others are indifferent to it or strongly dislike it. It also varies quite considerably according to the time of year. In the spring and summer it has a very acceptable flavour, but by autumn a distinct bitterness has crept in.
The root can be used cooked. Same comments on the smell as for the leaves.
Fruit. No further details, but the fruit is a capsule that contains many small seeds.
A decoction is used internally in the treatment of many ailments including cancer, coughs, dysentery, enteritis and fever.
Its use is said to strengthen the immune system.
Externally, it is used in the treatment of snake bites and skin disorders.
The leaves and stems are harvested during the growing season and used fresh in decoctions.