Tickseed Coreopsis lanceolata
This herbaceous perennial derives from Central and south-eastern United States and belongs to the Asteraceae family. It grows in small clumps but forms extensive colonies, reaching little more than half a metre in height. It has leaves that grow to about 7-11cm in length, opposite, and sometimes alternating near the top where the leaves are fewer. Flower heads are yellow, and are between 3 and 4cm across and occur between October and December.