Gymnocarpium dryopteris 'Plumosum'is commonly known as the oak fern. This is a low-growing, spreading, deciduous fern with triangular, 3-pinnate fronds. It is a north American native byt is hardy here in the UK.
Fronds are light to yellow-green when young, turning dark green with age.
Has a spreading habit and grows to a height of up to 45 cms.
Likes moist, rich, woodland soil.
Keep in shade or semi-shade.
Not invasive, but forms a gentle mounding spread of up to 100cms.