They've declined by 30% in the last 10 years alone and there are now thought to be fewer than a million left in the UK, according to the RHS. | more… https://www.google.com/url?rct=j&sa=t&url=http://www.shropshirestar.com/lifestyle/gardening/2015/10/06/a-prickly-subject/&ct=ga&cd=CAIyHDQxMjEzYTNjZmYwOWZjYzQ6Y28udWs6ZW46R0I&usg=AFQjCNGGGaC0R9ix9I9H7VECRZfTdTe1lA