With its bright pink flowers and fairly common appearance in Europe, and North America, when Himalayan balsam blossoms it can grow up to two metres tall with rough, reddish stems and shiny oval-shaped leaves. As alluring as it sounds, this plant, frequently found along waterways or damp areas, is highly invasive and causes a number……

Halting the spread of Himalayan balsam: a CABI interview — Invasive Species Blog