This incudes a number of species and hybrids in the Mentha spicata group, which are cultivated in gardens and often naturalised.  They are very difficult to separate.  Usually strongly and sweetly aromatic. Leaves lanceolate to narrowly ovate, sharply toothed, flowers pinkish, purplish or white 2 to 3.5 mm long in a long dense spike, sometimes branched.

other mints, including hybrids and garden varieties

Damp habitats, waster ground, former allotments.

July to October.

Perennial.

Widely naturalised in Britain, but rather occasional and local. It is classed as an 'archaeophyte' (ancient introduction).