Unknown plant in a clump

Unknown plant in a clump

Observation - Unknown plant in a clump. Description: (Ignore the plant at the bottom of the photo)Anyone got any idea what the clump of stems is with leaves in pairs that rotate round the stem. The plant is approx as tall as a road cone. The area has lots of domestic & formal gardens nearby so it might not

(Ignore the plant at the bottom of the photo)Anyone got any idea what the clump of stems is with leaves in pairs that rotate round the stem. The plant is approx as tall as a road cone. The area has lots of domestic & formal gardens nearby so it might not be 'wild'.