Crofton Weed Ageratina adenophora
This perennial evergreen is an herbaceous shrub that is a member of the Asteracea family, and originates from Central America (Mexico). It has opposite trowel-shaped serrated leaves that are 6–10 cm in length and 3–6 cm in width. The small compound flowers occur between August and December, and are found in terminal clusters. Each flower head is up to 0.5 cm in diameter and creamy white in colour. They are followed by a small brown seed with a white feathery 'parachute'. This plant is poisonous.