Propagation
Sow fresh seeds during spring and maintain a temperature of 10º to 13º C. (50º to 55º F).

Divide established clumps (rhizome) during spring.
Take basal cuttings during summer.

Note:
It tolerates a wide range of conditions and in some regions has become a weed. 
This herbal plant has been used for stomach disorders, coughs, flatulence and at the start of fevers. It is also used in cooking with fish and meat.

Botanic information
Leaf: The dark green ovate leaves have an obtuse to an acute apex and a short petiole. They are arranged in opposite pairs and may be pubescent. They are highly aromatic with a minty-aroma and are commonly used in cooking or as a herbal remedy.

Flower: The white to pink tubulate flowers are accompanied by whorls of overlapping purple-green bracts and are arranged in a loose panicle or corymb-like cluster that appears from midsummer to early autumn.

Fruit: The tiny fruit contains 4-nutlets. The seeds are viable but the plant may be reproduced vegetatively.