The Jezo spruce or Yezo spruce (Picea jezoensis or Picea yezoensis) is a large evergreen tree growing up to 45 m tall and with a trunk diameter of up to 2 m. It is native to northeast Asia, from the mountains of central Japan and the Changbai Mountains on the China-North Korea border, north to eastern Siberia, including the Sikhote-Alin, Kuril Islands, Sakhalin and Kamchatka.
It is found in cold but humid temperate rain forests, and nowhere does its range extend more than 400 km from the Pacific Ocean.
The bark is thin and scaly, becoming fissured in old trees. The crown is broad conic. The shoots are pale buff-brown, glabrous (hairless) but with prominent pulvini. The leaves are needle-like, dark green above.
Jezo Spruce is very closely related to Sitka Spruce (Picea sitchensis), which replaces it on the opposite side of the north Pacific. They, particularly subsp. jezoensis, can be difficult to distinguish, with the absence of stomata on the upper surface of the leaves of P. jezoensis being the best feature. Its leaves are also somewhat blunter, less sharply spine-tipped, than Sitka Spruce.
This species is not very successful in Britain. Whilst it is very cold-hardy when dormant, it comes into new growth too early in the spring and this growth is often cut back by late frosts.
It is also occasionally planted as an ornamental tree in large gardens.
The Ainu string instrument called tonkori has a body made from Jezo Spruce.
Genus - Picea
Species - Jezoensis
Common name - Jezo Spruce
Pre-Treatment - Required
Hardiness zones - 3 - 7
Height - 75-150' / 22 - 45 m
Spread - 20'-30' / 6 - 9m
Plant type - Tree
Vegetation type - Evergreen
Exposure - Full Sun
Growth rate - Medium
Soil PH - Acidic, Neutral
Soil type - Sandy, loamy, clay
Water requirements - Average, moist
Landscape uses - Large specimen evergreen that grows best in cool summer climates. Bonsai
Leaf / Flower color - Green / --
1. Soak the seeds in room temperature water overnight.
2. Keep the seeds in refrigerated, soil-filled zip-lock bags for 2-3 months after the initial soaking, a process that mimics the natural dormancy period they would experience during winter months in the wild. Some experts recommend this method, and others say seeds may be planted immediately after soaking. If soaked seeds are not kept in soil, they may be refrigerated for up to 14 days before use.
3. Place a 7 cm (3") layer of dry soil, such as peat moss or clean sand, in a small vase. Bury spruce seeds 5 mm (1/4") below soil. Cover soil with mulch layer. Keep the vase in a partially shaded place. Water occasionally, so that the soil is always slightly moist.
4. Seed will sprout in three to eight weeks. For one year, keep seedling in partially shaded place. Water occasionally, so that the soil is slightly moist.
5. After one year, transfer the seedling to a gallon-sized vase or larger, maintaining a balance of dry, clean soil and mulch. The seedling may now be kept in full sun. Continue watering occasionally, so that soil is slightly moist. (info source: eHow.com)
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