Indian Balsam

Indian Balsam

Observation - Indian Balsam. Description: Lilac purple 2.5-3cm long flowerhead, quite widespread throughout the woodland shade. Plants about 1-1.5m tall. I really don't know what this plant is. I cannot find it in any of the identification guides I've got.

Lilac purple 2.5-3cm long flowerhead, quite widespread throughout the woodland shade. Plants about 1-1.5m tall.
I really don't know what this plant is. I cannot find it in any of the identification guides I've got.