The Christmas fern (Polystichum acrostichoides, 15-18 in.) with rich dark glossy leaves, is one of the sturdiest and most dependable. Last year’s fronds are still green as this year’s new ones emerge. You can easily recognize the Christmas fern for each pinna is shaped like a long Christmas stocking, foot and all (foot against the stem). Light brown scales also cling to the stalk. One plant for years remains one plant. It spreads by spores alone, not by underground runners or by division of clumps.

The evergreen wood-fern, leather wood-fern or marginal shield fern (Dryopteris marginalise 2-3 ft.) weathers almost any winter and is found among snowy boulders in thickly forested areas. It is common, easy to grow, and spreads very slowly, remaining a single plant for some time. You will recognize this fern by fruit dots located on the margins of the pinnae, the chestnut brown scales on the stems, and its habit in the growing season of erupting its roots several inches up out of the ground!
The common polypody (Polypodium vulgare, 4-10 in.) sends a parade of erect fronds marching across the surface of rocky ledges where they are bright green whether surrounded by snow or by summer. They soften harsh ledges wherever they grow, also cling to steep banks, and make splendid terrarium material.

The ebony spleenwort (Asplenium platyneuron, 4-12 in.) is almost evergreen. You can find its twisting turning stem and delicate green pinnae snuggled in any bank of snow along with ground pine and cedar. It takes many hard freezes before this fern finally gives up.  It is ideal for terrariums.

This entry was posted on Wednesday, June 25th, 2008 at 6:02 pm and is filed under flowers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.