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When required, Abbreviated Planting Plans shall be submitted with a site development or building permit application. The Plan shall compensate for the additional impervious area within the buffer by planting native tree, shrub, and groundcover vegetation within an area equal to the area of expansion. Plans shall consist of a site diagram identifying the following (see example on following page):

1. The expansion footprint; where will the expansion occur?

2. The square footage of the expansion; how many square feet of expansion will occur?

3. The location of an equal area, or areas, to be planted.

4. The number of tree, shrub, and groundcover species to be planted. The planting plan shall include no less than one tree species, two shrub species, and two groundcover species. Table 18E.40.070-1 provides a list of native plants that may be suitable for planting.

5. Number of plants to be installed. Use these calculations to determine the total number of plants needed. See example planting plan on following page.

Plant Type

Spacing

Number of Plants = Square Footage divided by:

Trees

12-15 feet on-center

144 – 225 square feet

Shrubs

6 feet on-center

36 square feet

Herb/Groundcover

3 feet on-center

9 square feet

6. Monitoring. The applicant shall provide photos showing the planting area prior to planting and at 6, 12, and 24 months post-planting.

Example: Planting Plan Site Diagram

The proposed expansion = 420 sq.ft.

Trees:

420 sq. ft. / 144 sq. ft. = 2.9 trees (round up to 3 trees)

Shrubs:

420 sq. ft. / 36 sq. ft. = 11.6 shrubs (round up to 12)

Herb/Groundcover:

420 sq. ft. / 9 sq. ft. = 46.6 herb/groundcover (round up to 47)

Summary To compensate for the additional 420 square feet of encroachment into the buffer, 3 trees (1 or more species), 12 shrubs (2 or more species), and 47 herb/groundcover plants (2 or more species) are to be installed.

Table 18E.40.070-1. Native Plant List 

 

Approximate Height

Full Sun

Part Sun/ Shade

Full Shade

Drought Tolerant

Wetlands

Buffers

Evergreen Trees

Douglas fir

Pseudotsuga menziesii

100-250'

X

X

X

X

grand fir

Abies grandis

100-250'

X

X

X

Madrone

Arbutus menziesii

30-50'

X

X

X

X

shore pine

Pinus contorta

15-50'

X

X

X

X

X

Sitka spruce

Picea sitchensis

100-210'

X

X

X

X

western hemlock

Tsuga heterophylla

225'

X

X

X

X

western red cedar

Thuja plicata

200'

X

X

X

X

X

X

western white pine

Pinus monticola

80-130'

X

X

X

X

western yew

Taxus brevifolia

6-45'

X

X

X

Deciduous Trees

bigleaf maple

Acer macrophyllum

40-100'

X

X

X

bitter cherry

Prunus emarginata v. mollis

20-50'

X

X

X

X

black cottonwood

Populus balsamifera v. trichocarpa

100-200'

X

X

X

X

choke cherry

Prunus virginiana

20-50'

X

X

X

X

Garry oak (Oregon white oak)

Quercus garryana

75'

X

X

X

X

Oregon ash

Fraxinus latifoia

40-80'

X

X

X

X

Pacific crabapple

Malus fusca (Pyrus fusca)

40'

X

X

X

Pacific willow

Salix lucida spp. lasiandra

40-60'

X

X

X

X

Pacific dogwood

Cornus nuttallii

20-30'

X

X

X

X

quaking aspen

Populus tremuloides

75'

X

X

X

X

western red alder

Alnus rubra

30-120'

X

X

X

X

X

X

Evergreen Shrubs

evergreen huckleberry

Vaccinium ovatum

3-5'

X

X

X

X

X

low Oregon grape

Mahonia nervosa

2'

X

X

X

X

Pacific rhododendron

Rhododendron macrophyllum

24'

X

X

X

X

salal

Gualtheria shallon

3-7'

X

X

X

X

X

tall Oregon grape

Mahonia aquifolium

5-10'

X

X

X

X

Deciduous Shrubs

baldhip rose

Rosa gymnocarpa

6'

X

X

X

beaked hazelnut

Corylus cornuta

20'

X

X

X

X

X

black gooseberry

Ribes lacustre

2-7'

X

X

black hawthorn

Crataegus douglasii v. suksdorfii

20-30'

X

X

X

X

black twinberry

Lonicera involucrata

2-7'

X

X

X

X

X

blue elderberry

Sambucus caerulea

20'

X

X

X

cascara

Rhamnus purshiana

35'

X

X

X

X

X

clustered wild rose

Rosa pisocarpa

8'

X

X

X

X

X

Hookers willow

Salix hookeriana

18'

X

X

Indian plum

Oemleria cerasiformis

5-16'

X

X

X

X

X

mock orange

Philadelphus lewisii

5-10'

X

X

X

mountain ash

Sorbus sitchensis

3-12'

X

X

X

X

Nootka rose

Rosa nutkana

2-8'

X

X

X

X

oceanspray

Holodiscus discolor

15'

X

X

X

X

orange honeysuckle

Lonicera ciliosa

18'

X

X

X

Pacific ninebark

Physocarpus capitatus

6-13'

X

X

X

red elderberry

Sambucus racemosa

20'

X

X

X

red-flowering currant

Ribes sanguineum

3-12'

X

X

X

red-osier dogwood

Cornus sericea v.stolonifera

15'

X

X

X

salmonberry

Rubus spectabilis

3-10'

X

X

X

X

X

Scouler willow

Salix scouleriana

6-40'

X

X

X

X

X

serviceberry

Amelanchier alnifolia

10-12'

X

X

X

X

Sitka willow

Salix sitchensis

3-26'

X

X

X

X

snowberry

Symphoricarpos albus

2-6'

X

X

X

X

stink currant

Ribes bracteosum

9'

X

X

thimbleberry

Rubus parviflorus

2-10'

X

X

X

vine maple

Acer circinatum

25'

X

X

X

X

Herbs and Groundcovers

bunchberry

Cornus canadensis

2-10"

X

X

X

X

camas

Camassia quamash

35"

X

X

X

coastal strawberry

Fragaria chiloensis

13"

X

X

X

X

creeping mahonia

Mahonia repens

5-50"

X

X

X

X

deer fern

Blechnum spicant

1-3'

X

X

X

X

goat's beard

Aruncus sylvester

3-6'

X

X

X

false lily-of-the-valley

Maianthemum dilatatum

3-12"

X

X

X

false Solomon's seal

Smilacina racemosa

1-3'

X

X

kinnickinnick

Arctostaphylos uva-ursi

12"

X

X

X

X

lady fern

Athyrium filix-femina

2-5'

X

X

X

X

large leaf avens

Geum macrophyllum

3'

X

X

X

X

X

nodding onion

Allium cernuum

25"

X

X

X

Pacific bleeding heart

Dicentra formosa

6-20"

X

X

X

pearly everlasting

Anaphalis margaritacea

10-50"

X

X

X

X

piggy-back plant

Tolmiea menziesii

20-40"

X

X

X

seathrift

Armeria maritima

5-20"

X

X

X

sword fern

Polystichum munitum

5'

X

X

X

X

X

twinflower

Linnaea borealis

5"

X

X

western columbine

Aquilegia formosa

2'

X

X

X

X

western trillium

Trillium ovatum

6-18"

X

X

X

X

wild ginger

Asarum caudatum

2-8"

X

X

X

wild strawberry

Fragaria virginiana

13"

X

X

X

X

wood fern

Dryopteris expansa

3'

X

X

X

X

This is not an inclusive list of all Northwest native plant species. In addition, many of the plant species listed above are commercially available in varieties that are not native to the northwest. It is required that the native varieties (identified by scientific names) be used in wetland and buffer areas. The native varieties may be difficult to find at standard nurseries. In this case, nurseries specializing in native plants should be contacted.

Native species are adapted to this climate and tend to grow well here. However, as site conditions vary, so will the survival and growth rate of individual species. When feasible, supplemental irrigation of planted material during the first two growing seasons will greatly improve their chances of survival, especially those in full sun. Once established, these species do not require irrigation, but will grow faster when not stressed for water. Other factors influencing plant growth include proper planting, availability of sun and/or shade, soil condition, and availability of nutrients.

Please do not remove plants from a wetland or buffer, or transplant them without prior approval from Pierce County Planning and Land Services.

(Ord. 2013-45s4 § 4 (part), 2015)