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Red Alder

Alnus rubra

Alnus rubra (red alder) is a deciduous broadleaf tree in the Betulaceae (Birch) family native to western North America. In California it is found primarily along the coast from San Luis Obispo County northward. In southern california Alnus rhombifolia is the more commonly found alder. Red Alder is the largest species of alder in North America and one of the largest in the world, reaching heights of 20-30 meters. The official tallest red alder (1979) stands 32 meters tall in Clatsop County, Oregon (USA). The name derives from the bright rusty red color that develops in bruised or scraped bark. The bark is mottled, ashy-gray and smooth, often draped with moss. Large trees are often unbranched for a considerable distance from the ground. The leaves are ovate, 7-15 centimeter long, with bluntly serrated edges and a distinct point at the end; the leaf margin is revolute, the very edge being curled under, a diagnostic character which distinguishes it from all other alders. The leaves turn yellow in the autumn before falling. The male flowers are dangling reddish catkins 10-15 centimeter long in early spring, and female flowers are erect catkins which develop into small, woody, superficially cone-like oval dry fruit 2-3 centimeter long. The flowers are wind pollinated, and a large amount of airborne pollen is produced in early spring. The seeds develop between the woody leaves of the 'cones' and are shed in the autumn and winter.

Surface roots can be problematic if the tree receives frequent, shallow watering. Better to water deep and infrequently. Established trees with deep roots can be surprisingly drought tolerant. This is a large tree that requires plenty of space. Best suited for restoration or large gardens with bioswales or streams.

Bert Johnson Little Sur Manzanita

Arctostaphylos edmundsii 'Bert Johnson'

Horticultural selection from Arctostaphylos edmundsii. Arctstaphylos edmunsii 'Bert Johnson' originates from the Tilden Botanic Garden, and is a special selection from A. edmunsii manzanitas growing in the county of Monterey, California. A. Bert Johnson is a low growing manzanita that forms a nearly perfect mat, standing less than 1 foot high but spreading 6 feet. This manzanita makes an excellent ground cover and is equally attractive spilling over walls or boulders. Bert Johnson's cascading habit allows it to thrive on hillsides; its low branches root as they spread, helping to keep the soil in place and erosion under control. Bert Johnson manzanita is also known by the name Bronze Mat manzanita, owing to the fact that the new growth on this plant is tinged a delicate bronze color. The densely clustered leaves are small on this manzanita, and a dark gray-green color, giving the plant a sophisticated appearance reminiscent of boxwood. In late winter and spring, A. Bert Johnson is covered in pink-tinged white flowers, and is beloved by butterflies and hummingbirds. A. Bert Johnson would like full sun in coastal conditions, but might benefit from a little afternoon shade in very hot inland areas. This plant prefers well-drained soil, enjoying occasional summer watering to look its best but ultimately remaining staunchly drought tolerant. A great choice for a native groundcover. Tolerates almost any soil type. Prefers sun in coastal sites, and part shade in inland sites. Introduced by Tilden Botanic Garden.

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