Illustrative photo.
Mahonia 'Myoy' VOLCANO hybrid threadleaf mahonia, Oregon grape
size/type
medium-sized shrub,medium-sized shrub
usual height
0,5-1m
usual width
0,5-1m
leaves
evergreen broadleaf
colour of leaves
flowers
showy
colour of flowers
blooming time
October-November
location
semi-shade / partial sun
soil type
any (acidic to alkaline)
soil moisture requirements
evenly moist but well-drained
USDA zone (lowest)
8 (down to -18°C)
winter protection
for zone 5+6
for zone 7
categorized
Mahonia
threadleaf mahonia (Oregon grape) is a Chinese taxon formerly known as mahonia confusa. Perhaps only with it rising popularity thanks to newly invented varieties its name was changed to m.eurybracteata. The first successful varieties were Narihira, Soft Caress, and Sweet Winter.Description of the plant:
Japanese breeder Seiju Yamaguchi from Mizunami-shi in Prefecture Gigu has been working with mahonias for some time now. In 2023, he comes with a completely unique product – a hybrid of threadleaf mahonia which is the world's first registered variety with golden yellow flowers and orange buds. Its name is VOLCANO and the inflorescence resembles that of mahonia Cabaret® variety, but the foliage is entirely different.Volcano mahonia bears evergreen leaves, only about 1-2 cm wide, leathery yet soft to touch, glossy, dark green when mature and copper orange as they emerge. They form loose fronds on an airy shrub. In autumn unroll 10-20 cm tall, upright racemes composed of small, deep yellow, fragrant flowers which open from rich orange buds. If pollinated, they are followed by purple blue, edible berries that taste like barberry berries. If autumn is cold, flowers wait until warmer parts of late winter or spring to open.
It grows moderately into a dense shrub about 1m tall and wide. It loves a bit of sun and midday shade, or partial shade all day long. Plants grown in full sun set more flowers but are prone to sunscorch in colder climates. Still, they regenerate readily after spring pruning. This mahonia will be a jewel among other large-leaved evergreens and a fine-textured understory of mid-sized trees providing filtered sunlight.
Threadleaf mahonia requires fertile soil of any pH (acidic, neutral, and alkaline). It likes constantly moist but well-drained soil. We experienced the best results with acidic soil where its foliage produced the richest colour. It does not like drought so keep it mulched all year long. Its hardiness has been tested to -18 °C (USDA zone 7) so far, and we continue with hardiness trials as we believe it might take a few degrees lower.
Last update 09-10-2024
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