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Alder Tree Seeds
We offer fresh alder seeds, when you receive these seeds, you will need to soak them in warm water for 24 hours, then cold stratify, then sow.
E3140 Nepal Alder ( Alnus nepalensis )
A multipurpose alder tree found in the subtropical highlands of the Himalaya. It is called Utis in Nepalese and Nepalese Alder in English.
A deciduous alder with silver-gray bark that reaches up to 80 feet in height. It occurs throughout the Himalaya at 500-3000 m of elevation from Pakistan through Nepal and Bhutan to Yunnan in southwest China.
The leaves are shallowly toothed, 7-16 cm long and 5-10 cm broad. The flowers are catkins, unusually for an alder produced in the autumn, with the seeds maturing the following year. Utis wood is moderately soft. It is occasionally used for making boxes and in light construction, and as firewood.
The tree establishes rapidly on areas subject to landslides, binding the soil with its extensive root system and stabilizing the slope. Wood is soft, tough, even grained, rather durable, easily sawn, seasons well and does not warp. It is used to a limited extent in carpentry, house construction, tea boxes, for making furniture, rope bridges etc.
The tree grows quickly and is sometimes planted as erosion control on hillsides and for land recovery in shifting cultivation. It fixes nitrogen. It tolerates a wide variety of soil types and grows well in very wet areas. Zones 7-9.
E3141 Mountain Alder ( Alnus tenuifolia )
A deciduous Tree growing to 30 feet at a fast rate.
It is in flower in March, and the seeds ripen in October. The flowers are monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and are pollinated by wind.It can fix nitrogen.
This is an excellent pioneer species for re-establishing woodlands on disused farmland, difficult sites etc. Its fast rate of growth means that it quickly provides sheltered conditions to allow more permanent woodland trees to become established. In addition, bacteria on the roots fix atmospheric nitrogen - whilst this enables the tree to grow well in quite poor soils it also makes some of this nitrogen available to other plants growing nearby. Alder trees also have a heavy leaf canopy and when the leaves fall in the autumn they help to build up the humus content of the soil. Alder seedlings do not compete well in shady woodland conditions and so this species gradually dies out as the other trees become established. The tree has an extensive root system and can be planted to control banks from erosion.
The bark and the strobils are a source of tannin. A dark dye is obtained from the bark. The colour can range from orange through red to brown. Wood - soft, straight-grained, very durable in water. It is of no commercial value, though it is used locally as a fuel.
Suitable for medium and heavy soils and can grow in heavy clay and nutritionally poor soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist or wet soil. Zones 2-7.
E3142 Manchurian Alder ( Alnus hirsuta )
Manchurian Alder has grayish green foliage throughout the season. The oval leaves turn yellow in fall. It has deep purple catkins hanging below the branches in early spring before the leaves.
Manchurian Alder is a deciduous tree with an upright spreading habit of growth. Its average texture blends into the landscape, but can be balanced by one or two finer or coarser trees or shrubs for an effective composition. This is a relatively low maintenance tree, and is best pruned in late winter once the threat of extreme cold has passed. It has no significant negative characteristics.
Manchurian Alder will grow to be about 40 feet tall at maturity, with a spread of 30 feet. It has a low canopy with a typical clearance of 5 feet from the ground, and should not be planted underneath power lines. It grows at a medium rate, and under ideal conditions can be expected to live for 70 years or more.
This tree performs well in both full sun and full shade. It is quite adaptable, preferring to grow in average to wet conditions, and will even tolerate some standing water. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution.
E3143 Italian Alder ( Alnus cordata )
Italian alder is a pyramidal, fast-growing, small to medium-sized, deciduous tree that is native to Corsica and southern Italy. It typically grows to 30-50’ in cultivation. It is particularly noted for its attractive glossy green leaves. Flowers are monoecious (separate male and female flowers on the same tree) appearing in catkins. Male catkins are yellow-green (elongated to 2-3” long). Female catkins are reddish-green but very small (1/4" long). Catkins appear in March before the leaves emerge. Female catkins are followed by 1-inch long fruiting cones (strobiles) composed of winged seeds. These fruiting cones (largest in the Alnus genus) resemble small pine cones and are attractive to birds. They mature to reddish-brown in fall and persist into winter.
Mature bark is a light gray-brown with fissures and ridging. Ovate, finely toothed, glossy green leaves (to 2-4" long) remain on the tree late into fall (December), with insignificant fall color produced. Trees can fix nitrogen from the air. Alnus comes from the Latin name for alder. Cordata means heart-shaped in reference to the leaves.
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