It is described as looking like an ‘enormous cow parsley plant. When it is fully grown, it can reach towering heights of between 1.5m to 5m and have a spread of between 1 and 2cm. It forms a ...

Among the nitrogen-lovers thriving on exhaust fumes are those that Plantlife calls the "thugs of the plant world". They include stinging nettle, bramble, rough meadow-grass, cow parsley ...