July Color Appears at the Center for Urban Horticulture

July 25th, 2015 by UWBG Arborist, Chris Watson

Featuring a Selection of Trees at the Center for Urban Horticulture

Selected cuttings from the Center for Urban Horticulture (July 20, 2015 - August 2, 2015)

Selected cuttings from the Center for Urban Horticulture (July 20, 2015 – August 2, 2015)

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.

4)  Lagerstroemia indica             Crape Myrtle

  • This amazingly resilient and adaptable tree has had three homes in its lifespan.
  • Planted in 1963 around the original Washington Park Arboretum (WPA) buildings,
  • Then moved in 1984 to the WPA Mediterranean beds.
  • Moved to its current resting spot at CUH, south side of Isaacson Hall in 1990.

5)  Juniperus scopulorum             Rocky Mountain Juniper

  • Cuttings would not be complete without featuring a Pacific Northwest native tree at CUH.
  • OK, so it’s not found in the Puget Sound area, but its range does include parts of eastern Washington.
  • This upright specimen can be found anchoring the southeastern corner of the Soest Herbaceous Display Garden.

July Color Appears at the Washington Park Arboretum

July 12th, 2015 by UWBG Horticulturist
Selected cuttings from the Washington Park Arboretum (July 6 - 20, 2015)

Selected cuttings from the Washington Park Arboretum (July 6 – 20, 2015)

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.
  • Located atop the rockery at the east end of the trail above the Gateway to Chile

5)  Rehderodendron macrocarpum                Mu gua hong

  • Native to Mt. Emei, Sichuan Province, China
  • Small deciduous tree 20 to 30 feet tall, related to Styrax
  • Located east of Azalea Way on the north end of the Rhododendron Hybrid bed

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

July 2nd, 2015 by Pat Chinn-Sloan
Selected cuttings from the Washington Park Arboretum (June 22 - July 5, 2015)

Selected cuttings from the Washington Park Arboretum (June 22 – July 5, 2015)

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

June Color Appears at the Washington Park Arboretum

June 15th, 2015 by UWBG Horticulturist
Selected cuttings from the Washington Park Arboretum (June 8 - 21, 2015)

Selected cuttings from the Washington Park Arboretum (June 8 – 21, 2015)

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.  This specimen is located along Azalea Way near the Hybrid Bed.

2)  Kalmia latifolila           Mountain Laurel

  • A dense, bushy shrub with glossy, dark green leaves and large corymbs of cup-shaped flowers, Kalmia latifolia is native to North America.  Thought by many to be our country’s most beautiful flowering shrub, it is the state flower of both Connecticut and Pennsylvania.
  • This specimen is located along the lower trail, near Rhododendron Glen.

3)  Quercus robur  ‘Concordia’           Golden English Oak

  • A standout specimen amongst the late spring flush of green, Q. robur ‘Concordia’ offers us bright yellow young foliage which will eventually turn color in the fall.
  • It is located on the east side of Azalea Way near the Woodland Garden.

4)  Pterocarya stenoptera           Chinese Wingnut

  • A large spreading tree with long pinnate leaves and winged green fruit produced in pendent spikes up to 12 inches in length.  Wingnuts are a member of the plant family Juglandaceae.
  • This specimen is located at the south end of the nut flats, just west of Azalea Way.

5)  Staphylea pinnata           Bladdernut

  • A deciduous shrub up to 15 feet high, S. pinnata is known for its curious bladder-like fruits in late spring and early summer.  This specimen is located amongst the True Ashes, west of Azalea Way.

May Color Appears at the Washington Park Arboretum

May 15th, 2015 by UWBG Horticulturist
Selected cuttings from the Washington Park Arboretum (May 11-24, 2015)

Selected cuttings from the Washington Park Arboretum (May 11-24, 2015)

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.
  • Alpine tree heath has white flowers versus light-gray, and the scent is reminiscent of honey.

3)  Hydrangea luteovenosa           Sweet Hydrangea

  • In full bloom now, this semi-trailing Hydrangea is located on the Ridgetop Trail in Rhododendron Glen.
  • Though widely distributed in western Japan, this species of Hydrangea is critically endangered in Korea.

4)  Rhododendron ‘Snow Lady’ x Rhododendron degronianum ssp yakushimanum

  • Hybrids are often created to blend two or more outstanding traits from two separate taxa into one single plant, e.g. flower color and leaf indumentum.
  • There are several areas in the Washington Park Arboretum, including Azalea Way, Loderi Valley, Rhododendron Glen and the Puget Sound Rhododendron Hybridizers bed, showcasing many hundreds of hybrids of Rhododendron.

5)  Syringa reflexa           Nodding Lilac

  • The buds of Syringa reflexa start out a rosy–red before opening to pink and eventually fading to almost white.
  • The specific epithet “reflexa” refers to the nodding habit of the flower heads.
  • Lilacs are located throughout the Washington Park Arboretum, though many are found just south of the Woodland Garden along Azalea Way.

The Boys and Girls and Their Boats

May 1st, 2015 by UWBG Horticulturist
Selected cuttings from the Washington Park Arboretum (April 27 - May 10, 2015)

Selected cuttings from the Washington Park Arboretum (April 27 – May 10, 2015)

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.

2)  Pinus lambertiana        Sugar Pine

  • Keels of Pocock’s boats were made from this soft, even-grained Oregon native.
  • Sugar pine has very low shrinkage when it dries, so hull warping and cracking was kept to a minimum with this choice wood.

3)  Xanthocyparis nootkatensis        Alaska Yellow Cedar

  • Cheeks (two lowest timbers at the head rails) and washboards (thin planks fastened to the side to keep out water) were made from this honey-colored wood.
  • Pocock was especially fond of the way Xanthocyparis aged with Thuja plicata.

4)  Picea sitchensis       Sitka Spruce

  • Hand-carved seats and gunnels (uppermost plank in a hull) were made from these giants from Vancouver, BC.

5)  Picea engelmannii        Engelman Spruce

  • Oars used in rowing competitions are made from Engelman Spruce.
  • The oar consists of three bonded pieces made from one single plank of Engelman spruce split to make mirror-imaged sides, and another piece is cut for the center.

Resources:  http://www.pocockclassic.org, http://shipwrightjournal.blogspot.com

April Color Appears at the Washington Park Arboretum

April 19th, 2015 by UWBG Horticulturist
Selected cuttings from the Washington Park Arboretum (April 13 - 26, 2015)

Selected cuttings from the Washington Park Arboretum (April 13 – 26, 2015)

1)  Acer cissifolium        Vine-leaf Maple

  • A three-leaf maple native to Japan.
  • The extraordinary racemes of tiny flowers give the tree a cloud-like appearance.
  • Located in the Asiatic Maple Collection.

2)  Acer rubrum        Red Maple

  • This popular street tree is native to eastern North America.
  • On this sample the petals have fallen, leaving the elongating peduncles and their tiny, immature samaras.
  • Located in grid 3-5E on Arboretum Drive.

3)  Cornus florida        Flowering Dogwood

  • Named for its showy bracts.
  • Native to the eastern United States.
  • These cuttings are from ‘Royal Red’ near the south end of Azalea Way and from an unlabeled white cultivar near the north end.

4)  Cornus nuttallii        Pacific Dogwood

  • A west coast native named for Thomas Nuttall– a British botanist and explorer.
  • Natural seedlings are scattered throughout the Arboretum.
  • This is the provincial “flower” and floral emblem of British Columbia.

5)  Cornus nuttallii x florida    ‘Eddie’s White Wonder’

  • So named because it was one of a few survivors of a flood at Henry Eddie’s nursery near Vancouver, B.C.
  • It is a hybrid of Cornus nuttallii and C. florida.
  • Several specimens are growing along Azalea Way.

Core Collection Highlight: Viburnum

April 5th, 2015 by UWBG Horticulturist
Selected cuttings from the Viburnum Collection at the Washington Park Arboretum (3/30/15-4/13/15)

Selected cuttings from the Viburnum Collection at the Washington Park Arboretum (3/30/15 – 4/13/15)

Our Viburnum Collection is recognized as one of the top three national collections. Our taxonomic display currently is home to over 100 different kinds and 330 living specimens.
[Description references: “Viburnums — Shrubs for Every Season” by Michael Dirr.]
Here are a few samples of this diverse and ornamental shrub.

1)  Viburnum carlesii var. bitchiuense        Bitchu Viburnum

  • Wonderfully fragrant flowers in early spring.
  • Closely allied to V. carlesii.  Botanists still debate whether to “split” or “lump”.
  • Located across from the Graham Visitor Center in full flower. Grid: 40-3E

2)  Viburnum macrocephalum       Chinese Snowball Viburnum

  • 6’-10’ rounded shrub.
  • Known for 3″ – 8″ wide, hemispherical cymes, hence the name “Snowball”.
  • Located along maintenance facility mixed-shrub border fence. Grid: 43-5E

3)  Viburnum propinquum

  • Large evergreen shrub with glossy three-veined leaves.
  • Known to be tender in cold Pacific Northwest winters.
  • Located in the Rhododendron Glen parking lot landscape. Grid: 12-8E

4)  Viburnum x rhytidophylloides ‘Alleghany’        Lantanaphyllum Viburnum

  • National Arboretum introduction in 1958.
  • Handsome dense evergreen shrub with abundant inflorescences.
  • Located in Viburnum Collection. Grid: 25-5W

5)  Viburnum utile        Service Viburnum

  • Rare in commerce, but important evergreen species for breeding.
  • Dirr doesn’t think it has much ornamental value. I (David Zuckerman) disagree.
  • Located in Viburnum Collection. Grid: 26-4W

March Color Appears at the Washington Park Arboretum, Part II

March 23rd, 2015 by UWBG Arborist, Chris Watson
Selected cuttings from the Washington Park Arboretum (March 16-30, 3015)

Selected cuttings from the Washington Park Arboretum (March 16 – 30, 3015)

1)  Acer tegmentosum  ‘Joe Witt’        Stripebark Maple

  • A small- to medium-size tree with distinct striped patterns along the bark and branches
  • Named for a former Washington Park Arboretum curator
  • Located in the Joe Witt Winter Garden

2)  Berberis x media  ‘Arthur Menzies’        Hybrid Mahonia

  • Multi-stemmed shrub with prominent winter flowers
  • Loved by hummingbirds as a source of winter nectar
  • Located in the Joe Witt Winter Garden

3)  Ceanothus  ‘Puget Blue’        California Lilac

  • A fast growing, medium-sized shrub
  • Known for small dark, evergreen leaves and purplish-blue late spring flower
  • Located along the fence in the Graham Visitors Center’s parking lot

4)  Magnolia x kewensis  ‘Wada’s Memory’        Hybrid Magnolia

  • Selected from a group of seedlings from nurseryman, Koichiro Wada
  • Known for large and abundant spring flowers
  • Two specimens flank Arboretum Drive near the Hydrangea Collection

5)  Nothofagus antarctica  ‘Puget Pillar’        Southern Beech

  • A medium-sized deciduous tree native to Argentina and Chile
  • Known for a somewhat fastigiate growth habit
  • Located along the shore near Duck Bay

Early Spring Has Begun!

March 6th, 2015 by UWBG Horticulturist
Selected cuttings from the Washington Park Arboretum (March 2 - 16, 2015)

Selected cuttings from the Washington Park Arboretum (March 2 – 16, 2015)

1)  Acer triflorum        Three Flower Maple

  • A small, slow-growing deciduous tree 20’ to 45’ where it is native in Manchuria and Korea.  An excellent landscape tree boasting light grey vertically-furrowed bark and vivid red and orange fall color.  The name refers to its flowers, which are borne in clusters of three.
  • Discovered by noted plant explorer, Ernest H. Wilson in 1917.
  • Located in the Asiatic Maples Collection.  Grid: 26-B

2)  Corylopsis sinensis var. calverescens        Winter Hazel

  • A medium-sized deciduous, broadly vase-shaped shrub in the Witch Hazel family.
  • Bean describes it as flowering in April.
  • Located in the Witt Winter Garden.  Grid: 34-1E

3)  Magnolia x loebneri‘Ballerina’        Magnolia

  • This small deciduous tree is a hybrid between M. x loebneri ‘Spring Snow’ and M. stellata ‘Water Lilly’.
  • The specific epithet honors Max Loebner, a German horticulturist, who made the first cross of this hybrid in the early 1900s.
  • Located on the west side of Arboretum Drive in the Magnolias Collection.  Grid: 28-4E

4)  Rhododendron thomsonii ssp. thomsonii        ‘Glory of Penjerrick’

  • A large evergreen shrub with a rounded crown noted for very early bloom time.
  • An early hybrid used as parent for many subsequent Rhododendron hybrids.
  • Located west of Azalea Way, north of the path to the Wilcox foot bridge.

5)  Sorbus caloneura        Whitebeam

  • This small upright deciduous tree is native to southeastern China and Tibet.
  • The leaves are heavily pleated, giving them the appearance of beech leaves.
  • Fruit are extremely hard and persist well into winter.
  • Located at the south end of the Sorbus Collection.  Grid: 20-4E