""'Hacquetia epipactis " "'( Plant Hardiness Zones 5 to 7 according to the United States Department of Agriculture ( though it is hardier than indicated and can be grown easily down to at least Zone 3 ), and looks best in a woodland setting which imitates its native habitat.
22.
Downy birch ( " Betula pubescens " ), common sallow ( " Salix caprea " ) and alder ( " Alnus glutinosa " ) grow on sections of the site, beneath which can be found the narrow-lipped helleborine ( " Epipactis leptochila " ), characteristic of metalliferous sites in Northumberland and uncommon elsewhere.
23.
The eastern part of the site is undisturbed grassland which, as well as species commonly associated with magnesian limestone, has a small population of the locally rare mountain everlasting, " Antennaria dioica ", and good populations of dark-red helleborine, " Epipactis atrorubens ", and perennial flax, " Linum perenne " subsp . " anglicum ", both of which are nationally scarce.
