You might have a think about which variety they are too. If I recall correctly there are the lovely English versions and the 'terrible' Spanish ones. The Spanish ones can hybidise with the English ones essentially wiping them out as a species (I may be over egging it a bit). The advice we had was to remove them and allow English ones to flourish.
Yup, Spanish bluebells (although scented so hybrid). I've let them flower but thinking I'll pull them up after. They certainly are aggressive - feels like three as many as last year!
You might have a think about which variety they are too. If I recall correctly there are the lovely English versions and the 'terrible' Spanish ones. The Spanish ones can hybidise with the English ones essentially wiping them out as a species (I may be over egging it a bit). The advice we had was to remove them and allow English ones to flourish.
http://www.bbowt.org.uk/blog/bbowtblog/2016/04/18/how-tell-difference-between-native-bluebell-and-spanish-bluebell
PS our allotment bod is not Nigel Farrage.