Woody > Cryptomeria > Cryptomeria japonica > Cryptomeria japonica 'Spiralis'
Cryptomeria japonica
'Spiralis'
Origin: Originated in Japan in the mid 1800, the cultivar name was published in 1844 by Siebold and Zuccarini.
Mike's
Opinion
"
Cryptomeria japonica ‘Spiralis’ is a very eye-catching evergreen with bright green foliage. It is a tree from the Cupressaceae family. With another common name it has ‘Granny Ringlets’ describing the habit of the foliage on the unique cultivar. The needles twist spirally around the branches giving the plant its distinctive look. As Cryptomeria japonica ‘Spiralis’ matures it starts mounding, later developing an upright leader. However, it can be pruned to keep rounded form. It’s pretty hardy and prefers colder temperatures around -6°C - 0°,and looks the most attractive in the winter time. ‘Spiralis’ doesn’t produce flowers or fruit, so it is propagated by cuttings and is not used in the landscape as much as I thought for being such a unique cultivar.
Michael Pascoe, NDP., ODH., CLT., MSc. (Plant Conservation)
"
| Family |
| Cupressaceae |
| Genus |
| Cryptomeria |
| Species |
| japonica |
| Cultivar |
| 'Spiralis' |
| Category |
| Woody |
| Type |
| Tree (evergreen) |
| USDA Hardiness Zone |
| 5 - 7 |
| Canadian Hardiness Zone |
| 5b - 9a |
| RHS Hardiness Zone |
| H4 |
| Temperature (°C) |
| (-6) |
| Temperature (°F) |
| 20 |
| Height |
| 6 - 10 |
| Spread |
| 7 - 8 |
Photographs
Description and Growing Information
Flowering Period
| General Description |
| Is a medium to large evergreen and moderately slow growing Japanese Cedar cultivar. The light green foliage of ‘Spiralis’ twists around the branches throughout the entire plant, hence the name spiral. |
| Landscape |
| Cryptomeria japonica ‘Spiralis’ only has a couple uses in the landscape. It’s a vigorous, globe shaped plant when young. ‘Spiralis’ will develop a leader and a broad, upright habit that makes a dramatic impression in the landscape as an accent or specimen plant. Or can be a screen when mature because of its density. |
| Cultivation |
| Prefers to be grown in full sun in a sheltered location. Tolerates most but thrives in sandy, well-drained soils. Proper pH should be acidic to neutral soils with an ideal 5.0-7.0 pH. It’s slightly salt tolerant and completely tolerant to deer. |
| Shape |
| Rounded and dense for the first 10-15 years of its life, when matured it will develop an upright leader making the plant more pyramidal. |
| Growth |
| Medium |
| ID Characteristic |
| Has light green, awl type foliage that spirals around the branches. When young the plant is more rounded, but as it matures it becomes more pyramidal. This cultivar is also non-flowering. |
| Pests |
| Has no serious insect or disease problems. Leaf blight and leaf spot are the only two diseases that can affect this cultivar. |
| Habitat |
| Horticultural Origin. |
| Bark/Stem Description |
| Slightly pendulous branches, with exfoliating reddish bark. |
| Flower/Leaf Bud Description |
| Has bare, light brown coloured buds about 1-2 cm long. |
| Leaf Description |
| Has short, light green awl-like foliage that covers the entire branch top to bottom by spirally wrapping around it. Also mildly variegated on the tips of branches. |
| Flower Description |
| Cryptomeria japonica ‘Spiralis’ is a sterile cultivar and does not produce flowers. |
| Fruit Description |
| Cryptomeria japonica ‘Spiralis’ is a sterile cultivar and does not produce fruit. |
| Colour Description |
| Leaves stay the same light green colour all year long, until it matures and is at full height where the foliage turns a darker shade. The bark is mostly brown with a reddish tint. |
| Texture Description |
| Medium |
| Notable Specimens |
| There is a notable specimen in the Akatsuka Botanical Garden in Itabashi, Tokyo. |
| Propagation |
| Propagation of Cryptomeria japonica ‘Spiralis’ is best done from semi-hardwood cuttings. Semi-hardwood cuttings generally root easily and don’t require a lot of extra knowledge. You take cuttings from the growing tips of the plant, ideal lengths are 4-6 inches using your pruners. The cutting should be healthy and have no signs of pests or disease. Plant the semi-hardwood cutting in a container filled with unfertilized potting mix and coarse sand. Water the cutting well and cover it with doms for moisture. Place in indirect sunlight because direct sunlight may be too harsh and scorch the cutting. |
| Ethnobotanical Uses (Disclaimer) |
| Cryptomeria japonica was extremely important in early Japanese society, both for a source of building materials and for its spiritual aspects. Traditional Japanese culture places high value on natural items, and this attitude persists to the modern day. The ancient Japanese religion of Shinto represented a connection between man and nature and tall trees had special significance. Cryptomeria japonica are found at the center of many Shinto shrines. I couldn't find any specific research about ‘Spiralis’ but I imagine it would be used in similar ways. |
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