Marginal Wood Fern is a vase-shaped well-behaved, non-colonizing fern for the cool, woodland landscape. Never becoming aggressive, the broad, dark, leathery, evergreen fronds of marginal wood fern are from 1-3 ft. high and as much ... as 10 in. wide. Fiddleheads show up in spring and are golden brown and furry. In snowy winters, it can be glimpsed protruding through the snow, its blue-green coloration in contrast to the surrounding white.