Rosebay Willow herb (Epilobium angusti folium) Up to 120cm high it is widely spread throughout Britain flowering July -September.
The next is common ragwort (Senecio jacobaea) . A biennial that grows on waste ground and sand dunes. Flowering June - October.
"Ragwort thou humble flower with tattered leaves
I love to see thee come and litter gold
So bright and glaring that the very light
Of the rich sunshine doth to paleness turn
And seem but very shadows in thy light.
John Clare