Dryopteris erythrosora var. KOIDZUMIANA Japanese Rosy Buckler fern, autumn fern
size/type
low perennial,low perennial
usual height
0,3-0,4m
usual width
0,3-0,5m
leaves
evergreen broadleaf
colour of leaves
location
semi-shade to shade
soil type
acidic (peaty) to neutral
soil moisture requirements
evenly moist (dislikes drought)
USDA zone (lowest)
7 (down to -23°C)
winter protection
for zone 5+6
for zone 7
categorized
Dryopteris
Japanese Rosy Buckler Fern (autumn fern) is an evergreen and very attractive fern species easily distinguished by brightly coloured young leaves and distinctly regular fronds. Koidzumiana is a variety selected and introduced by the former president of the American Fern Society, Barbara Jo Hoshozaki (1925-2012). She devoted most of her life to ferns, their study and well as correcting taxonomic errors.Description of the plant:
Koidzumiana is a Japanese Rosy Buckler fern which stands out for its beautifully coloured young leaves, like all varieties from this group. But koidzumiana has a more prominent rusty red shade, which changes to bronze-golden, and later leaves mature to deep green. The leaves are glossy, bi-pinnate and form 30-50 cm long, slightly arching fronds. Their size is directly proportional to the amount of nutrients in soil and location – this variety prefers a warmer spot. New leaves once or even twice more during the growing season and remain handsome until the first hard frosts. In spring they are perhaps the slowest to show up.Japanese fern is a reliable and undemanding species, fern growers often make fun of it saying that it is for amateurs because it is almost indestructible. It can handle worse soil conditions and virtually thrives on neglect. It prefers partial shade but lives deep shade, too, acidic soil will enhance foliage colour but is not a must, and even moisture will help produce a dense tuft. It will not live in heavy clay or water-logged ground. Remove all foliage after winter. Hardy to about -24 ° C (USDA zone 6).
Last update: 23-04-2023
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GLOSSARY
- STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
- DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
- EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
- STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
- HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
- SHRUB - a woody plant with branches growing bushy from the ground level.
- HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
- FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
- GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
