October Color Appears at the Washington Park Arboretum

1)  Cedrus atlantica ‘Glauca’                Blue Atlas Cedar A large coniferous tree with vivid, glaucous blue foliage, making it easy to identify. Native to Algeria and Morocco on the Atlas Mountains, these specimens can grow up to 100 feet tall and beyond. Located in the Pinetum near the Lynn Street play area. 2)  Cunninghamia lanceolata                China Fir Members of the family Taxodiaceae, these trees are named after James Cunningham, who originally found C. 

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A Wind in the Willows (and Cedars, Firs, Maples…)

How some trees react to high winds. 1)  Pseudotsuga menziesii                Douglas Fir The detritus lying on the ground following a wind event in the Pacific Northwest provides ample evidence of how P. menziesii defends itself against wind. The wood of P. menziesii is brittle and can snap. When a strong wind acts on a Douglas Fir, the tree sacrifices small pieces of foliage to shed the wind’s energy. 

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Pittosporum (Pitta=pitch, Sporum=seed) : August 17 - 30, 2015

Native to New Zealand (and Australia, Asia, and Africa). Flowers are sweetly scented and seeds are coated with a sticky substance giving the plant its name, pitch-seed. All plants below can be seen growing in the New Zealand Forest in the Pacific Connections Garden. 1)   Pittosporum eugenioides               Lemonwood New Zealand’s tallest Pittosporum, P. eugenioides can reach 40 feet. Its yellow-green leaves with curly edges have a strong scent of lemon when crushed. 

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Leafless in Seattle

1)  Clematis afoliata Native to the dry, eastern side of New Zealand. Now growing in our New Zealand Focal Forest. Eventually becomes a wiry mound with fragrant spring flowers. 2)  Hakea epiglottis Native to Tasmania and growing outside our Education Office. Hakea needs sun and dry, infertile soil. The round “stems” are true leaves despite their appearance. 3)  Phyllocladus aspleniifolius Another Tasmanian native, this tree prefers moist lowlands. 

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July Color Appears at the Center for Urban Horticulture

Featuring a Selection of Trees at the Center for Urban Horticulture 1)  Acer japonicum  ‘Aconitifolium’                         Fern Leaf Maple Grove of six located in McVay Courtyard Planted in 1986, original design element for McVay Courtyard Beautiful leaf texture with extraordinary fall color The most iconic tree at the Center for Urban Horticulture (CUH) 2)  Cedrus deodara             Deodar Cedar Two mature specimens located at northeastern entrance to Event Lawn (x from Greenhouse) The only conifers remaining from pre-CUH development Probably planted post-war years (1950s) for UW married student housing 3)  x Chitalpa tashkentensis  ‘Morning Cloud’                                                                           Morning Cloud Chitalpa An inter-generic cross between Catalpa bignonioides and Chilopsis linearis A hardy drought tolerant tree currently in flower, hence its cultivar namesake Several specimens located in bed along NE 41st Street, west entrance to CUH. 

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July Color Appears at the Washington Park Arboretum

1)  Itea ilicifolia                Holly-leaved Sweet Spire Native to western China Evergreen shrub growing up to 16 feet tall and 10 feet wide Bears fragrant racemes of greenish-white flowers in late summer and fall Located west of the Magnolia Collection near the south end of the Asiatic Maples 2)  Lomatia myricoides                Long-leaf Lomatia Native to New South Wales in southeastern Australia One of the hardier members of the Proteaceae Honey-scented white flowers are much visited by bees in summer Located across Arboretum Drive from the New Zealand Focal Forest 3)  Pterocarya stenoptera                Chinese Wingnut Native to China Deciduous tree to 70 feet or greater, with a trunk diameter as large as 8 feet Located west of Azalea Way, north of Loderi Valley 4)  Quercus vacciniifolia                Huckleberry Oak Native to western North America, mountains of the Sierra Nevada and southern Cascade Range Leaves and acorns are an important food source for birds and mammals within its native range. 

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June Color Appears at the Washington Park Arboretum (Part II)

1)  Quercus gilva                    Evergreen Oak Native to China and Japan Reaches heights of 90-100 feet in its native range Located in the Oak Collection along the South Oaks Extension Trail 2)  Rhododendron calophytum           Beautiful-face Rhododendron Native to China Large species rhododendron capable of becoming a tree Located along trail between Loderi Valley and the Woodland Garden 3)  Sequoia sempervirons  ‘Cantab’                     Coast Redwood A cultivar of the coast redwood with unique needles Specimens vary in form from shrubby to tree-like Located in the north end of the Pinetum, along the Pinetum Trail 4)  Thujopsis dolobrata                    Hiba Arborvitae A Japanese native Capable of reaching 100 feet or more in Japan, yet large specimens are rare in the Seattle area Located along the south slope of the Woodland Garden 5)  Viburnum rhytidophyllum                    Leatherleaf Viburnum Native to China Large evergreen shrub recorded to heights of 30 feet Located along the trail through the Viburnum Collection 

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June Color Appears at the Washington Park Arboretum

1)  Cornus controversa           Giant Dogwood A rounded deciduous tree bearing spreading, tiered branches and alternate, elliptic leaves, C. controversa can potentially reach 40 feet in height.  White flowers are borne in large, flattened cymes in early summer.  Following the flowers, masses of deep red fruit develop, changing to blue-black. Native to China, the Himalayas and Japan, C. controversa is less cold tolerant than our native dogwoods.  

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May Color Appears at the Washington Park Arboretum

1)  Cytisus x praecox ’Luteus’           Warminster Broom This broom is a hybrid of C. multiflorus and C. purgans and is located on Arboretum Drive in the Legume Collection. Many of the brooms are blooming now or soon to bloom, including the pineapple broom, Argyrocytisus battandieri, whose fragrance earned it its common name. 2)  Erica arborea var. alpina           Tree Heath While non-alpine tree heath can reach heights in excess of 20 feet, the alpine variety is the “short” one, reaching only 10 to 15 feet. 

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The Boys and Girls and Their Boats

Opening Day crew races through the Montlake Cut, and the 1936 USA Olympic gold in rowing may never have happened without these following trees: 1)  Thuja plicata        Western Red Cedar UW’s world-renowned boat maker, George Pocock followed the lead of Native Americans and used this Pacific Northwest giant for the hulls of his Pocock Classics. The skin is made from a single plank of 3/32″ thick cedar and offers a combination of stiffness and springiness that eliminates the need for the extra weight of a hull. 

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