Because of the size, it sounds as if you likely have a Butterfly bush (Buddleja/Buddleia) which has similar spier shaped clustered flowers- however is more of a bush that grows to approx 16ft. Reply
Because of the size, it sounds as if you likely have a Butterfly bush (Buddleja/Buddleia) which has similar spier shaped clustered flowers- however is more of a bush that grows to approx 16ft.