Photo, picture:
Die Samen der Echten Zaunwinde koennen ueber 30 Jahre ausharren ehe sie austreiben - (Gemeine Zaunwinde - Foto Echte Zaunwinde bluehend)
Hedge Bindweed, seeds can remain viable as large as 30 years - (Larger Bindweed - Photo Hedge Bindweed blossoms)
Calystegia sepium

Gallery overview