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Home My WebLink AboutPlanning 2016-10-27 Item 4 - Low Impact Development / TMC Titles 18 and 8.25 Amendments - Attachment B: Preferred Bioretention Plantspreferred bioretention plants attachment b L16-0050 planting zones for bioretention cells bioretention cell diagram bioretention cell section Scientific Name Common Name Carexobnu to p Slough sedge Zone 1 2 3 Native Sun Exposure Mature Size On Center Spacing 75 %of Mature Spread 36" Fall Color Bloom Time & Color Late Spring Characteristics Spreads quickly; excellent soil p q Y binder Sun `y f' r ‘.,11r, _ Partial Shade Height 12" 36" Spread u to p 48" 1 2 -�.+ _ r ; ' ' ` I r' X- I Carex oshimensis 'Evergold' it t �, Variegted Japanese bk. 41 1Li $, ,NAi, ,. Sedge 2 3 `1 f - , 12 "- 24" 24 "- 36" 28" Late Spring - Early Summer Variegated leaves with white band; great for planting along sidewalk edges '.. t r i N. } l$ Carexstipagi '• , ,,,; Sawbeak Sedge _ k 1 x1, Iio 1 24 " -36" 24 " -36" 28" Spring Speads quickly Jong tapered foliage b iF ,J y c Juncus acuminatus � Taper- tipped Rush 1 �: / , , 6 "- 18" 12" 24" 18" Spring Summer Red -brown flowers; delicate ' 4 Juncus ensifolius Dagger -lead Rush 1 6" 15" 6" 9" 6" Summer Pom-pom like flowers; adds interest tolandsca e P w ' Juncus tenuis Slender Rush 1 2 - 6 " -20" 6 " -30" 22" Late Spring to Late Summer Bright green foliage li\1.4w r,tt r i• M. Scirpus acutus Hardstem Bulrush 1 10' 6' 4' Summer Gray -green to dark green foliage; dense W 4: . r- j -... :` Scirpus microcarpus Smllf d Bulrush a- ruite Burus 1 24 "- 36„ 12" -24" 18" Summer Spreads quickly; excellent soil binder Scientific Name Common Name 1 Zone 3 3 Native Sun Exposure Mature Size On Center Spacing 50% - 75% of Mature Spread 18 " -28" Fall Color Bloom Time & Color Late Summer Characteristics Low - growing plant; shear when blooming ceases in the autumn, returns in the spring 2 Sun r y , Partial Shade Height 24 " -36" Spread 18 " -36" IVY t Su 6 " � 7''.. Er. r Ak V . r Aster chilens►s California Aster ti + 2 Aquilegia formosa Western Columbine 2 3 - y ! , imp 12 " -36" 12 " -36" 18 " -28" Spring Excellent in wooland areas; attracts pollinators; tolerant of shallow Flooding 5 W Arctosta h los p Y UVa -Ursl Kinnikinnick or Bearberry 2 3 / `'� `r , k 6" - 12" 24" 36" 18 28 Spring - Summer ,' Glossy, leathery leaves; low- growing ground cover, easy care once established; bell shaped flowers; red berries _ 1 _ , t k -° 4. Asarum caudatum Wild ginger 2 3 4" 6" 36" 18" 28" Late Spring Glossy leaves that exude the fragranceofgingerwhencrushed Ar I„ - Athyrium fihx -femora Lady fern 1 2 3 36 " -60" 24" 12"-18" Fast- growing; tolerant of shallow flooding f ' 7 - Blechnum spicant Deer fern 1 2 3 12 " -36" 24" 12 " -18" Late Spring t, Dark, glossy leaves with a crinkled texture; tolerant of shallow flooding r.. Camassia leichtlinii Leichtlin's canvass 2 3 36 " -48" 12 " -24" 12 " -18" Late Spring w ' ' _ Imo. . Linear foliage; flowers range in color from white, cream, blue or purple; excellent fresh -cut flower ter' � � . � Camassia quamash Common canvass 2 3 18" 12" 6 " -9" Late Spring Distinct clusters of flowers make this plant attractive in mass plantings; best when planted in the autumn after weather cools Scientific Name Common Name 1 Zone 2 2 3 3 Native Sun Exposure Mature Size On Center Spacing 50% -75r of Mature Spread 4.5"-7" Fall Color Bloom Time & Color Late Spring - Characteristics Performs best in full shade; excellent complement to rhododendrons or ferns Sun Partial Shade Height 6 " -9" Spread 6 " -9" ORNAMENTAL PL ii 14 4 4. - "� Ss "° .a # Corms canadensis Bunchberry . - 4 Dicentra formosa ' Pacific Bleeding Heart 2 3 Y1 i r� 1 , x 12" 24" 12" 18„ Spring Delicate foliage; distinct spring- time flowers , r il a ,. ... Deschampsia cespitosa Tufted hair grass 2 3 , 1 '' x 6 "- 12" 24" 12 " -18" Spring ; d Stunning grassy foliage with creamy white variegation that turns pink in winter; spring-time inflorescence can make plant 4' -tall _ Fragaria chiloensis . • `rY Beach Strawberry M i 2 3 �; 1 i r r . 10" 36" 18 " -28" Summer Forms a lush, compact groundcover; cut back in the early spring to prompt new growth and reventstem build u p ; ornamental berries 1' `'' Fragaria vesca t Alpine Strawberry - 11.`c 2 3 i iii 'r_ -' ..- a 10" 36" 18" 28" Bears tiny, fragrant (and edible) berries in the summer months; attracts butterflies; likes some afternoon shade iM k. .3 Festuca idahoensis Idaho Fescue •i a 3 ,` 1 ` -� s 24" 24" 12" 18" Summer Dense plant gray -green foliage; excellent when planted alongside sidewalks or used as a ground- cover ,. - :r 5 `6 - ' , Hemerocallis e` Daylily �: ;.- y y 2 2 , ! rr r a ti 24 " -48" 24" 12 " -18" Spring - Summer Attracts pollinators; flower color dependent on cultivar (pink, red, orange, purple, yellow) ;iJ v • Heuchera varieties a _ / Alumroot ,r 2 3 24 " -36" 18" 9 " -14" Spring- Summer Many cultivars available; dintinct foliage and flower colors of chartreuse, white, and scarlet Scientific Name Common Name Zone Native Sun Sun 41'7 . , + Exposure Partial Shade Mature Height 24" Size Spread 24" On Center Spacing 50% -75i of Mature Spread 12 "- 18" Fall Color Bloom Time & Color Early Spring 1 Characteristics Clumping foliage; beautiful purple flowers are nice color addition to scheme 1 1 2 2 3 3 Iris dou las►ana it ;:_r g `6 Douglas Iris Iris tenax a1 Oregon Iris 1 2 3 f 1 tiN f ,- , . 18" 12" 6 " -9" Late Spring nift, lit Beautiful blue and purple flowers; nice color addition to any planting scheme Or ti ' Lillium columbianum ' ` , - Tiger Lily 2 3 , 1 f ' ` 5'-6' 36" 18"-28" Mid - Summer Produces one to six unscented blooms per stem; attracts butterflies y "', i `* ' "-`r+ 4;; " �' Lupinus varieties ;, » , "' 0, r: "" t Lupine 3 r �` `� r � , t 18" 48" 24" 30" 15" 22" Summer Attacts butterflies and caterpillars; p manycultivarsavailable Nothochelone K - '' +;' nemorosa . ;f `�rN_J. r Turtlehead 3 , '0.- 1 alp up to up to 40" 20 " -30" Summer Flowers continuously throughout the summer I • '! Ophiopogon planiscarpos { , Black Mondo grass 3 , 1 f r f 1 ' 12" 12" 6" 9' Spring/ Summer Black foliage makes this an excellent accent when used with brightly flowering plants; maintains color ± Penstemon varieties Pemstemon 3 4 " -24" (varies) 12 " -24" (varies) 12 " -18" (Varies) Summer (varies) Beautiful blue and purple flowers, depending on variant; nice color addition to planting scheme; attracts hummingbirds - "t - r Polystichum munitum Western Sword Fern 2 3 di ai 36 " -48" 36 " -60" 30 " -45" Beautiful foliage and size allows this plant to stand out in planting schemes �j + /q ORNA E 1 A.L'� Scientific Name Common Name °. PLANTS Sedum varieties Sedum Zone Native Sun Sun , 9 . , a' Exposure Partial Shade Mature Height 4 " -6" (varies) Size Spread 8 " -12" (varies) On Center Spacing 50 r - 75% of Mature Spread 6 " -9" (varies) Fall Color Bloom Time& Color Spring - Summer Characteristics Spoon shaped blue-green foliage, depending on variant; trailing stems; excellent as a groundcover 1 2 3 3ti ,° ; ± P = • :?1 ,, vii' i $x . = Sidalcea varieties Checkermallows, Cherckerblooms 1 �N a .� - , p 36"-48" (varies) 24"-36" (varies) 18"-28" (varies) Summer Fast - growing; many cultivars are appropriate for biortention cells, including S. hendersonii Smilacina racemosa Solomon's Plume 2 3 12"-36" 12"-36" 18"-28" Spring = Creamy spring -time blossoms are followed by yellow -green berries that turn to red; attracts birds; fragrant flowers $ f ; ti 4., `.{ - Solidago canadensis Goldenrod 2 3 u . f f , k 36" 24" 12 " -18" Late Sum - mer Small bright - yellow flowers make a lively addition to any planting scheme; narrow lance- shaped leaves -6 Tellima grandiflora Fringecup 2 3 12" 12" 6" 9„ Spring Foliage maintains appearance throughout the winter . * ,,,, r4, t- ' ,, • 4: -. Tiarella trifoliate Western Foamflower 2 3 l 12„ 12„ 6"-9" Summer Dense; foliage maintains appearance throughout the winter .- t " _, -., Trillium ovatum Western Trillium 2 3 18" 12" 6 " -9" Spring r''°_, Unique flower to add to any planting scheme S F W Lp; .,. _h * Vancouveria hexandra Duck's Foot 2 3 dill a& 12" 12 " -36" 18 " -28" Spring ? _ Foliage maintains appearance throughout the winter Scientific Name Common Name Zone Native Sun Exposure Sun Partial Shade Mature Height Size Spread On Center Spacing Fall Color Bloom Time & Color Characteristics 1 2 3 SMALL -TO- MEDIUM SHRUBS Cistus salvifolius 'Prostratus' Sageleaf Rockrose 3, i 1 ` 2' 50% -75% of Mature Spread 6' 3' -4.5' Spring- Summer s Evergreen; excellent for erosion control on banks; light gray - green leaves �» Cornus sanguinea Bloodtwig Dogwood 1 2 3 ... 1,_ �� i a . 6' 6' 3' 4.5' Summer ;' ;: _ Stunning red stems in the winter months; beautiful addition to bioretention cell for winter interest 4q �'' t -, Fw -. _o.F:, . Cornus sericea Dogwood 1 2 3 `s r r , 3' 8' 3' S' 2.5' 4' Summer — Manycultivarsavailable, including 'Flavimera' and 'Kelseyi; stunning colored stems in the winter months ,... Gaultheria shallon S n 2 3 5' 5' 2.5' -4' Spring Fast - growing when planted in shaded areas, otherwise difficult to establish Holodiscus discolor Cream Bush 3 _` ,_ y 8' 15' 7.5'-12' Summer Attracts pollinators; excellent soil binder a Mahonia aquifolium Oregon Grape 2 3 6' 10' S' 2.5'-4' Spring Attracts pollinators; blue and black berries -- Osmanthus burkwoodii Hybrid Sweet Olive 2 3 dr Ilk ' -10' 8' -12' 6' -9' Spring S6' t ' Leathery, glossy dark -green foliage; excellent when used as a hedge; tolerant of many soils °,r� '" y Osmanthus delavayi Sweet Olive 3 , 1 , x ' 5' -20' 7' -20' 10' -15' Spring Evergreen; dark green leaves with tubular flowers; year -round interest SMALL -TO- MEDIUM Scientific Name Common Name SHRUBS Philadelphus lewisii Mock Orange Zone Native Sun Sun 9 `� r` -7 r , , Exposure Partial Shade Mature Height 5' -10' Size Spread S' -10' On Center Spacing 50%-75% of Mature Spread S' -7.5' Fall Color Bloom Time & Color Summer ; ^ _ J Characteristics Founstain- shaped plant; aromatic flowers 1 2 2 3 f - - t,,, q, 3 Ph socar us y p capitatus Pacific Ninebark t+a. 1 2 3 f! , 1 , f Alp, ° 5' -10' 5' -10' 5' -7.5' Late Spring . f'"_ 2. u #_ Dense clusters of flowers; plamts resemble spirea; rejuvenate old plantings by cutting to ground ry � ' +"5 ch " " '�"!► *"� — fir, Ph socar os y P opulifolius Common Ninebark 2 3 1 1 r � --11107 ' ` 5' -10' 3' -6' 3' -4.5' Late Spring p g Dense clusters of flowers; plamts resemble spirea; rejuvenate old plantings by cutting to ground Pines mugo -mugo Dwarf Mugo Pine 3' r ` / 4' 5' 2.5' -4' Late Spring Low- growing; performs well, but variable in growing habit; great as an anchor plant . Rhododendron varieties Rhododendron 2 3 10' (varies) 10' (varies) 5' -7.5' (varies) Spring- Summer (varies) Many cultivars that vary in bloomtime, size, and color; leathery leafed with stunning flowers f Ribes sanguineum Red- Flowering Currant 2 3 `4 r' �s ., 4 4, 5' 12' 10' S' 7.5' Spring 411E. Produces drooping clusters of flowers = t Rosa gymnocarpa Baldhip Rose 2 3 `% I rr � ,- r . 5' 1'-2' l'-1.5' Spring- Summer Fast - growing to 3; slender ;; small rose with delicate stems and flowers; stems are bristled . ; Rosa pisocarpa Swamp Rose { � - y 1 2 3 A f r , , 10' 3' 6' 3' 4.5' Spring - Fall Unique among roses given its preference for wet, almost swampy conditions; stems have thorns SMALL -TO- MEDIUM Scientific Name Common Name SHRUBS Rosa nutkana Nootka Rose 1 Zone 2 2 3 3 Native Sun Exposure Mature Size On Center Spacing 50%-75% of Mature Spread 2' 3' Fall Color Bloom Time & Color Spring Characteristics Arching stems with gray -green leaves Sun Partial Shade Height 6' Spread 4' I& ` s4 ' s ., Rubus spectabilis Salmonberry 1 2 3 10' 10' 5' -7.5' Winter - Spring Fast-growing; excellent soil binder Salix purpurea Purple Osier 1 2 3ti 's 1 r f ) 15' 15' 7.5' -12' Dark green leaves with blue under- side; striking purple branches; cut to ground if overgrown `w.e + Sambucus nigra Elderberry 1 2 3 1 , SI � r , k 8' 8' 4'-6' Late Spring Dramatic accent plant; fragrant white flowers ' x w fi 4 . * 1r. ?d ' ` ' el c'` , s �F.. ... �' Symphoricarpos albus Snowberry 2 3 , k — 1 6' 6' 3'-4.5' Spring - - t -_ Pink spring -time flowers are followed by white berries that last through the winter; great for erosion control . P i yL.1. F Thuja plicata -, Whipcord 'Whipcord' Dwarf Red Cedar 2 3 's 1 . _ J f 1 k f 4' 4' 2' -3' Unusual and unique planting; cascading branches form a nice g mound; bronze winter color ' . `,i-r,'" Vaccinium parvifolium Red Huckleberry 2 3 4' -12' 6' 3' -4.5' Spring ) - Thin branches with cascading habit create a beautfil silhouette • LARGE SHRUBS Scientific Name Common Name AND TREES Acer clrc►natum Vine Maple Zone 1 2 3 Native Sun Exposure Mature Size Plant Strip Width S' On Center Spacing 50% of Mature Spread 15' Fall Color Bloom Time & Color Spring Characteristics Small, nearly symmetrical tree; multiple trunks Sun i , � _ Partial Shade Height 30' Spread 30' a r ` sue a.h A Iii " 2 3 ' ' ,, Alnus rubra - Red Alder , 1 2 3 Ai 45' -50' 20' -30' 6 15' „- Attractive light gray bark; dark green leaves with rust- colored underside; most common alder of the Pacific Northwest Betula papyfera Paper Birch 2 3 I ,, 1 ,, yti . k 50' -60' 25' 6' 12.5' i Attractive, creamy -white bark '" le =7- ! Corpus varieties Cherry Tree 3 ti 1 = yti r 5. 20' (varies) 20' (varies) 5' 10' (varies) Spring Highly adaparable to environment; many appropriate cultivars available � t #fir � l'_---,!ii {"'� ,r�' Corylus cornuta Beaked Hazlenut 2 3 , 1 1 rti / 1 20' 10' S' S' Vase -like shape; needs adequate space to grow, catkins add winter interest I" > .,w - Crataegus x lavalii - i Lavalle Hawthorne 3 s. , �r 25' 20' 5' 10' Spring Dark green leathery leaves; clusters fof red fruits add winter color Fraxinus latifolia -. «{ - Oregon Ash Eil 1 2ti . 1 At 60' 35' 6' 18' Tolerant of wet conditions '1 V; 4 • •A A Lonicera involucrata `'`- ;45, -, , BlackTwinberry ',-•• r 1 2 9' 10' 5' Summer ; ., - Attractive to hummingbirds Scientific Name Common Name LARGE SHRUBS AND TREES Malta fusca Crabapple Pacific Crabapple Zone Native Sun Exposure Sun Partial Shade Mature Height 10'-30' Size Plant Strip Spread Width On Center Spacing 50% of Mature Spread 15' Fall Color Bloom Time & Color Spring Characteristics Requires adequate room to grow; fragrant apple blossoms of white or pink; bears fruit 1 1 2 2 3 .` a fr r � i N , 10'-30' Myrica californica y Pacific Wax Myrtle 1 2 `� f = r r , 15' 15' 5' 7.5' Spring Many upright trunks; branches are densely covered in foliage; ur le n tlets attract birds P p useful in screening Parrotia persica Persian Parrotia 2 3 5 I f y � + 4 , 15' -30' 20' 5' 10' 00 Early Spring Smooth gray bark with white patches; colorful tree year- round • 4aF +T1 ,.." Rhamnus purshiana -r Cascara 2 3 ~� f' t 4 / ! S. 20' -40' 10' -30' S' 15' Smooth gray bark; picturesque branches; dark green leaves Salix lucida Pacific Willow 2 A f � . 1 • 15' 45' 30' 15' Spring Useful as a screening plant or windbreaker; aggressive roots are excellentforstablizing banks rt Sa1ix sitchensis Sitka Willow 1 2 f y . , 25' 15' 7.5' Spring Multi- stemmed; gray -brown bark; useful in screening P,A.MVIIIM j ' .: Sambucus caerulea Blue Elderberry 2 3 10'-30' 8'-20' 10' Spring i ' ' Clusters of summertime blue or black berries follow spring- time flowers LI J , 4 , t tr f ., + Thuja plicata Western Red Cedar 2 3 50'- 100' 25'-60' 12' 30' Many cultivars; slender, drooping branches with dark green leaves; re uires 9 q adequate space to grow 10