Since it is very fertile and grows true from seed, it has occasionally been able to naturalise in woodlands beyond its origins in the protected Fontainebleau woods, as at Abney Park Cemetery (an early Victorian garden cemetery in Stoke Newington, London).
Given its high fertility and ability to grow true from seeds, it has occasionally expanded beyond its native boundaries within the protected Fontainebleau woods, as seen at Abney Park Cemetery (a Victorian-era garden cemetery in Stoke Newington, London).