Woody > Juniperus > Juniperus scopulorum > Juniperus scopulorum 'Gray Gleam'
Juniperus scopulorum
'Gray Gleam'
Gray Gleam Juniper, Gray Gleam Rocky Mountain Juniper
Origin: Scott Wilmore created this cultivar in 1944, from a chance seedling in Morrison, Colorado, United States of America. He went on to patent it in 1949, and it is still supplied by Wilmore nurseries.
Mike's
Opinion
"
An upright juniper that offers winter interest in the landscape. Not just snowflakes sparkle! This ‘Gray Gleam’ Juniper has lovely silvery foliage that brightens in the cold weather and looks its best in the winter. ‘Gray Gleam’ can be pruned as desired and requires little maintenance due to its slow growth rate.
Michael Pascoe, NDP., ODH., CLT., MSc. (Plant Conservation)
"
| Family |
| Cupressaceae |
| Genus |
| Juniperus |
| Species |
| scopulorum |
| Cultivar |
| 'Gray Gleam' |
| Category |
| Woody |
| Type |
| Tree (evergreen) |
| USDA Hardiness Zone |
| 4 - 7 |
| Canadian Hardiness Zone |
| 3 - 5 |
| RHS Hardiness Zone |
| H7 |
| Temperature (°C) |
| -35 - -12 |
| Temperature (°F) |
| -30 - -10 |
| Height |
| 4 - 6 m |
| Spread |
| 2 - 3 m |
Photographs
Description and Growing Information
Flowering Period
| General Description |
| Juniperus scopulorum 'Gray Gleam' is hardy in cold climates, low maintenance, and used for colour in the urban landscape. Small and slow growing, it offers its colour throughout the seasons, although is at its best in the winter. It has green to blue-silvery scaled foliage and is easy to care for with only occasional pruning. Tolerant of a wide variety of soils with a need for full sun. Used for functional purposes in the garden, such as hedges and windbreaks, or simply to be admired. |
| Landscape |
| Used as a single accent plant in the landscape or grouped as a hedge to provide privacy, this cultivar has a showy look. The cold weather enhances its colour, ideal for winter interest and to offer colour in a season that often lacks vibrant attraction. |
| Cultivation |
| A relatively vigorous and low maintenance cultivar, it can grow in poor, acidic or alkaline soils, and is urban and cold weather tolerant. Not able to abide excessive water, it requires sparse watering and is drought tolerant, provided it gets plenty of sun. |
| Shape |
| ‘Gray Gleam’ can be pruned into desired shapes; however, it has a natural upright and densely compact growing habit throughout its lifespan. |
| ID Characteristic |
| With an upright, narrow conical growth habit, this cultivar has a unique, silvery grey glimmer and dense, scaled foliage on display during the winter. |
| Pests |
| There is no recorded pests of note that may deteriorate the planting of this cultivar, although this may be due to lack of substantiated research. Straight species have been recorded as a host for diseases such as cedar-apple rust, hawthorn rust, and quince rust, especially in warmer climates. Bagworms and mites are opportunistic pests commonly known to junipers as well. |
| Habitat |
| Horticultural origin. |
| Bark/Stem Description |
| The bark is dark reddish-brown in colour. It's thin, fibrous, and it usually shreds with age. |
| Leaf Description |
| Scaled needles that are blue green, turning silvery green in the winter in thin but densely compact branchlets. Takes on a frosted like appearance in the colder months. |
| Flower Description |
| Dioecious tree that flowers through April – June. Flower is supposedly so insignificant as to be ornamentally unmentionable in research, and it is not a factor in landscape usage for ‘Gray Gleam’. |
| Fruit Description |
| Female fruit is dark blue with a waxy filament and berry-like structure, ripening throughout the early autumn during September-October. The fruits are small, 0.4-0.7 cm, and male fruits are ovoid-ellipsoid in form, cone-like, and beige coloured, 0.2-0.4 cm. Neither are considered ornamentally significant, but attract birds. Fruits require 2 years to fully mature. |
| Colour Description |
| Blue-grey foliage in spring and summer with hints of silver in the autumn, fully brightening in the winter. Reddish-brown bark is obscured by dense foliage. |
| Texture Description |
| Medium textured plant through all seasons. |
| Notable Specimens |
| Arboretum at the University of Guelph, Ontario Canada, has a specimen part of their Conifer Tree Collection. |
| Propagation |
| This tree can be propagated through ripe berries and cuttings. Ripe berries can be gathered through September-October once seeds are fully mature, and then dried to 10-205 moisture, and stored at cold temperatures. Treat with sulfuric acid for 120 minutes, proceed with seed extraction and follow with 6 weeks of warm stratification at 20 - 30°C (70 to 85°F), or summer planting, then 10 weeks of prechilling at 4°C (40°F). Seeds can then be planted in seedbeds 15-20 cm apart, and covered with a 0.6 cm layer of soil, with a recommendation to sow in the autumn for prechilling advantages. Cuttings are to be rooted in the greenhouse, and can be taken at any time during the winter. They can alternatively be rooted outside on heated beds. Exposing the stock plants to several hard freezes seems to give better rooting. For propagating in an outdoor cold frame, cuttings are taken in late summer or early fall. There may be advantages to using bottom heat. Lightly wounding the base of the cuttings is sometimes helpful, and the use of root-promoting chemicals, especially IBA, is beneficial. |
| Ethnobotanical Uses (Disclaimer) |
| The Cheyennes steeped the leaves of the Rocky Mountain juniper, and drank the resulting tea to relieve persistent coughing or a tickling in the throat. This tea was used as a treatment for respiratory ailments, as well as to hasten labour in pregnant women. Tribes such as The Blackfeet and The Crow used it for other similar purposes, in the form of topical application of boiled leaves for aches and pains, and for consumption as medicinal teas. ‘Gray Gleam’ is reserved for ornamental use, but straight species have notable healing properties. |
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