At the heart of the Bog Garden is a magnificent royal fern, Osmunda regalis. The huge clump is around 7ft in height and comprises both sterile and fertile fronds.
The sterile fronds are a beautiful light apple green and are bipinnate, the 7-9 pairs of broad and long pinna subdividing down to a further 7-13 pairs of pinnules. The unfurling tips of new fronds have perfectly packed pinnae, mustard edged emerald.
In contrast, the fertile fronds are shorter, stouter and more rigidly upright and the dense covering of sporangia give a crumbly texture to the feather. The different stages of maturation of the sporangia means that the fertile fronds are a beautiful mix of sea green and biscuit brown.