Seattle Transportation recommends low growing plants (less than 24” high) for traffic circles and planting strips within 30’ of an intersection. Other planting strip plants may reach a height of 36”




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Seattle Transportation recommends low growing plants (less than 24” high) for traffic circles and planting strips within 30’ of an intersection. Other planting strip plants may reach a height of 36”. Trees should be pruned to provide visibility of oncoming traffic and the W-81 reflector sign. Rocks and wood or metal posts are NOT allowed in traffic calming devices within the street right-of-way.

 THESE PLANTS ARE LISTED AS SUGGESTIONS ONLY. AVAILABILITY MAY VARY 


PLANTS

NORTHWEST GARDEN

PERENNIAL GARDEN

HERB GARDEN

OTHER FUN PLANTS

Trees


Adirondack Crabapple (disease resistant)

Mt Ash


Dogwood ‘Eddies White Wonder’

Amelanchier (Serviceberry)

Washington Hawthorn

Others may be acceptable depending on site





Flowering Cherry**

Flowering Pear

Goldenrain Tree

Jacquemontii Birch

Maple

Raywood Ash



Thornless Cockspur Hawthorn


Ginkgo biloba

Honey Locust

Jackmontii Birch

Crabapple ‘Adirondack’



Deciduous Magnolia

Evergreen Magnolia

Goldenrain Tree

Red Oak


Washington Palm Tree


Shrubs


Evergreen Azalea, dwarf (not drought tolerant)

Heathers & Heaths, various low growing varieties

Mahonia nervosa (low Oregon grape)

Dwarf Rhododendrons



Mt Vernon Laurel

Dwarf Nandina

Potentilla fruticosa

Boxleaf Euonymous

‘Kobold’ Green Barberry

Forsythia ‘Bronxensis’



Lavender

Rosemary (low forms)

Sage

Hebe glaucophylla




Escallonia ‘Newport’ (not super drought tolerant)

Juniper ‘Blue carpet’

Spirea bumalda ‘Little Princess’

Ilex crenata ‘Helleri’



Other Ornamentals






Phormium ‘Jack Spratt’ & ‘Thumbelina’ (matures at or less than 2’ Tall)

Blue Fescue

Penesetum orientale




Alstroemeria (spreads)

Crocosmia ‘Kathleen’



Perennials

Astilbe, Campanula, Columbine, Coral bells, Dicentra, Geranium sanguineum, Penstemon, Sedum (dwarf varieties), Rockcress, Deer fern, Sword fern, Viola

Asters, Coreopsis, Day lily,

Dianthus, Dwarf Shasta Daisy,

Helianthemum (Sunrose),

Iris sibirica



Anthemis

Dusty Miller

Euphorbia

Sedum – many low growing ones



Bergenia

Kniphofia ‘Little Maid’

Lily ‘Miss America’

Salvia x jamensis ‘San Takao’



Ground Cover

Epimedium, Fragaria, Kinnikinnick

Mahonia repens, Rubus calycinoides




Bergenia crassifolia

Cottoneaster dammeri

Genista pilosa

Juniperus horizontalis

Liriope spicata


Ajuga

Woolly & Creeping Thyme




Raoulia autralis

Sedum & Sempervivum



Bulbs, Corms, etc.

Supplied by Volunteers

Anemone

Iris douglasiana




Dutch Iris, Iris sibirica, Iris setosa, Daffodils, Crocus






 THESE PLANTS ARE LISTED AS SUGGESTIONS ONLY. AVAILABILITY MAY VARY 

For a list of recommended trees, look at our web site: http://www.ci.seattle.wa.us/td/landserv.asp **Flowering Cherries are not

recommended at this time because of their susceptibility to the Cherry Bark Tortrix, a moth that damages these trees.

Low growing, drought tolerant, and encourages butterflies or hummingbirds

Latin Name

Common Name

Flower Color

Size (height x spread)**

Agastache var

Wild Hyssop

Blues and Orange varieties

Select low growing varieties**

Aquilegia species hb

Columbine

Various colors

2 to 3 feet**

Asclepias tuberosa bf hb

Butterfly Weed

Orange, sometimes Yellow

18 “ tall x 18” wide

Aster x frikartii ‘Monch’ bf

Aster

Lavender-blue

30” tall x 24” wide

Aster novi-belgi ‘Alert’ bf

Echinacea purpurea ‘White Swan’ bf

Coneflower

White

24” to 30” tall and 24” wide

Eriogonum umbellatum bf hb

Sulfur buckwheat

Shades of Yellow

10” tall x 18” wide

Gallardia grandiflora ‘Goblin’ bf

Red and yellow

12” tall x 15” wide

Heuchera sanguinea hb

Coral Bells

Pink and Red varieties

18” to 24” tall, 15” wide

Lavandula varieties bf

Lavender

Varieties vary - white to deep purple for flowers, silver to dark green for leaves

10” to 3 feet tall and as wide

depending on the variety **

Liatris punctata hb

Gayfeather

Purple

32” tall x 24” wide **

Lysimachia clethroides bf

Monarda x ‘Petite Delight’

Bee balm

Light Lavender-Rose flowers with glossy green foliage

15” tall x 24” wide

Penstemon varieties hb

Penstemon

Various colors

From 8” to 3 feet tall **

Salvia varieties hb bf

Humming birds really go for the reds

2 to 3 feet tall, **

Scabiosa x hybrids bf

Pincushion Flower

Pink or Blue

12” tall x 15” wide

Sedum telephium ‘Arthur Breanch’ bf

Stonecrop

Deep pink flower, burgundy stems

15-18” tall x 12” wide

Sedum telephium ‘Autumn Joy’

Showy Stonecrop

Flowers start pink and turn bronze

15-18” tall x 15” wide

Solidago ‘Golden Fleece’, ‘Fireworks’ bf

Dwarf Goldenrod

Golden Yellow

15” tall x 24” wide

Verbena varieties bf

Veronica varieties bf

Speedwell

Varieties range from White, Pink,

Blue, Purple

** Select varieties maturing

at less than 24” tall for planting in Traffic Circles

This is a sample listing of plants not suited for planting within 30’ of an intersection because they get too tall, bushy, or are considered to be invasive.




Bearded Iris, tall forms
Butterfly bush

Bamboo, except low ground cover types

C


Let us know if you see examples of creative and appropriate right-of-way plantings we can highlight on future lists.

ardoon, Globe Thistle & Artichoke

Fennel


Tall Grasses incl. Pampas grass

Holly


Ivy of any ilk!! (There is no benign ivy)

Lavatera

Lilac


New Zealand Flax (unless dwarf varieties that mature less than 24”)

Rhododendron, except low dwarf varieties

Roses – shrub and climbing

Shrubs whose growth exceeds 2-1/2 feet tall and that need continuous shearing such as: Photinia, Viburnum laurestinus & ‘Spring Bouquet’


Silver Lace Vine

Staghorn Sumac


Frequently asked Traffic Circle/ Street Right-of-Way Questions:

How do I dispose of garbage and clean green?

Typically, volunteers use their own garbage and green waste containers. If you have an abundance of material, contact Liz Ellis at 684-5008 to talk about getting a free dump pass.


How do I get water out to the garden?

First, ask a neighbor at one of the corners if you can use their water. If not, five gallon buckets or a garbage can in the back of a truck could get you through a few weeks of hot, dry weather. Water new trees with at least five gallons for every diameter inch of tree trunk once a week or as often as necessary.


My traffic circle garden needs mulch. Can the City help out?

The best source of mulch is free wood chips from a Tree Service company listed in the Yellow Pages. Otherwise beauty bark or compost can be used.


I would like to decorate my circle garden. Are rocks or sculpture allowed?

Only plants and an approved W-81 center sign are allowed in circles.


Are there any other special considerations to gardening in the street right of way?

Yes. Please only select plants that will mature at 2-feet tall to plant within 30' of the intersection. Trees should start out with a trunk diameter of 1-1/2 inches and be thinned if necessary so that the W-81 reflector sign is visible.

Please be safe! You are gardening in an area where drivers may not be paying close attention. Wear visible clothes. Liz can provide safety vests if necessary. Face oncoming traffic. Keep yourself and your tools off the roadway.

You'll find many other folks will be very supportive of your good work. Encourage them to join you, if not today perhaps another time!

Please don't hesitate to ask for help!

Prepared by Liz Ellis, updated 8/02. Please call SDOT Urban Forestry 684-8733 with suggestions for adding other plants to this list.




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