Hydrozones Key: Z=Zero/temporary; L=Low; M=Moderate; W=adaptable to intermittently wet soil between the WQCV Westminster Plant List and 100 year flood volume level of Botanical / Common Name stormwater infrastructure; n = to be Plants used in Zero and Low Hydrozones must have a "Z" or "L" planted a minimum of 100' away from respectively in the Hydrozone column and be on this list; and those stormwater inlet structures for Wn, and if listed without a "Yes" in the Native column may not be considered to Zn/Ln/Mn, planted away from streets, count toward minimum native plant requirements sidewalks & parking, in open, natural areas only to avoid nuissance conditions Hydrozone/Adaptable of to sides Hydrozone/Adaptable Storm Water (W) Basins Sun Tolerance Mature Height (ft.) Mature Width (ft.) Colorado Native Trees Shade Deciduous Trees Acer x fremanii / Autumn Blaze Maple M Full sun 50-60 25-30 - Acer platanoides and cvs. / Norway Maple cvs. M Full sun 40-60 25-30 - Acer rubrum / Red Maple M Full sun 40 40 - Acer saccharum / Sugar Maple M Full - partial 50-60 30-40 - Aesculus hippocastanum / Horsechestnut M Full - partial 40-60 25-50 - Catalpa speciosa / Catalpa species (Northern/Western) Z,L,M,Wn Full sun 40-50 25-35 Yes Celtis species / Hackberry Zn, Wn only Full sun 50 35-40 Yes Corylus colurna / Turkish Filbert L,M Full sun 40-50 20-30 - Gleditsia triacanthos inermis / Thornless Honeylocust cvs. Z,L Full sun 40 40 - Gymnocladus dioica / Kentucky Coffeetree Z,L,M,Wn Full sun 50-60 30-40 - Metasequoia glyptostroboides / Dawn Redwood M Full sun 50 20 - Phellodendron amurense / Amur corktree M Full sun 30-35 25-30 - Platanus occidentalis / American Sycamore M,W Full sun 60 60 - Platanus x acerifolia / Planetree M,W Full sun 50 60 - Populus sargentii / Plains Cottonwood (seedless cvs. only) Wn only Full sun 60-80 50-60 Yes Quercus alba / White Oak M Full sun 50-60 40-50 - Quercus bicolor / Swamp White Oak L,M Full sun 50-60 40-50 - Quercus macrocarpa / Bur Oak Z,L Full sun 50-80 40-60 - Quercus muehlenbergii / Chinkapin Oak Z,L Full sun 35-50 35-50 - Quercus robur / English Oak L,M Full sun 50-60 40-50 - Quercus rubra / Northern Red Oak M Full sun 50-80 40-60 - Quercus shumardii / Shumard Oak L,M Full sun 40-60 40-60 - Salix amygdaloides / Peachleaf Willow Wn only Full sun 30-40 25-30 Yes Sophora japonica / Japanese Pagoda Tree M Full sun 40 40 - Tilia americana / American Linden M Full - partial 50-75 25-30 - Tilia cordata / Littleleaf Linden M Full sun 30-50 15-20 - Tilia tomentosa and cvs. / Silverleaf Linden M Full sun 50-75 25-30 - Ulmus americana 'New Harmony' / American Elm M,W Full sun 60-70 45-60 - Ulmus wilsoniana 'Prospector' / Prospector Elm M,W Full sun 35-40 25-30 - Ornamental Deciduous Trees Acer ginnala / Amur Maple M Full sun 15-20 15-20 - Acer glabrum / Rocky Mountain Maple M Full sun 15-25 15-20 Yes Acer grandidentatum / Bigtooth Maple (non grafted) L,M Full sun 20-30 10-20 Yes Acer negundo / Boxelder Maple (Male cvs. only) Zn, Wn only Full sun 25-30 25-30 Yes Acer tataricum / Tatarian Maple L,M Full - partial 15-20 15-20 - Aesculus glabra / Ohio Buckeye Z,L Full sun 20-30 15-20 - Alnus tenuifolia / Thin leaf Alder M Full - partial 15-30 15-20 Yes Amelanchier canadensis / Shadblow Serviceberry L,M Full - partial 15-25 15-20 Yes Amelanchier utahensis / Utah Serviceberry L,M Full - partial 15-20 15-20 Yes Amelanchier x grandiflora / Serviceberry L,M Full - partial 15-20 15-20 - Betula occidentalis / Western Water Birch M,W Full sun 20-30 15-20 Yes Cercis canadensis / Redbud M,W Full - partial 25 20 - Crataegus ambigua / Russian Hawthorn L,M,Wn Full sun 20 20 - Crataegus crus-galli inermis / Thornless Cockspur Hawthorn L,M,Wn Full sun 20 20 - Crataegus phaenopyrum / Washington Hawthorn L,M Full sun 20 20 - Koelreuteria paniculata / Goldenrain tree Z,L Full sun 25-30 25-30 - Malus species and cultivars / Crabapple L,M Full sun 30 30 - Phellodendron amurense / Amur Corktree M Full sun 30 30 - Prunus americana / Plum Zn ,Ln Full - partial 10-20 8-12 Yes Prunus armeniaca / Apricot tree Zn ,Ln Full sun 15-20 15-20 - Prunus avium / Sweet Cherry Mn Full sun 20 20 - Prunus cerasus / Sour Cherry Mn Full sun 25 25 - Prunus maackii / Amur Chokecherry Z,L,M,Wn Full sun 20-30 15-20 - Prunus nigra / Princess Kay Plum M Full - partial 15-20 15-20 - Prunus padus / Mayday Tree M Full sun 15-20 15-20 - Prunus persica / Peach Mn Full sun 25 25 - Prunus virginiana/spp. and cvs. / Red Chokecherry L,M Full sun 20-25 10-15 Yes Ptelea trifoliata / Wafer Ash, Hoptree L Full sun 15 15 Yes Pyrus calleryana / Ornamental Pear tree L,M Full sun 30 25 - Pyrus ussuriensis / Ussurian Pear tree Z,L Full sun 20-25 15-20 - Quercus gambelii / Gambel Scrub Oak Z,L Full sun 15-30 15-20 Yes Sorbus aucuparia / European Mountain Ash M Full - partial 35 20-25 - Sorbus intermedia / Swedish Whitebeam M Full - partial 25 20 - Syringa reticulata and cvs. / Japanese Lilac M Full sun 20-30 15-25 - Xanthoceras sorbifolium 'Psgan' / Golden Yellowhorn L,M Full sun 15-20 15 - Evergreen Trees Abies concolor / White Fir M All levels 50-75 15-25 Yes Cupressus arizonica / Arizona Cypress Z,L Full sun 20-30 10-20 - Juniperus chinensis / Upright Juniper cvs. Z,L Full sun 15-20 15-20 - Juniperus monosperma / One Seed Upright Juniper cvs. Z,L Full sun 15-20 15-20 Yes Juniperus osteosperma / Utah Juniper L Full sun 15-20 10-15 Yes Juniperus scopulorum / Rocky Mountain Upright Juniper cvs. Z,L,M,W Full sun 15-20 20-30 Yes Picea abies / Norway Spruce M Full sun 50 25-30 - Picea pungens / Colorado Spruce M Full - partial 60 30 Yes Pinus aristata / Bristlecone Pine Z,L Full sun 25 25 Yes Pinus contorta / Lodgepole Pine L Full sun 30-40 15 Yes Pinus edulis / Pinon Pine Z,L Full sun 15-20 15-20 Yes Pinus flexilis / Limber pine L Full - partial 35 15-20 Yes Pinus heldreichii / Bosnian Pine M Full sun 30-40 15 - Pinus monophylla / Singleleaf Pinyon Z,L Full sun 15-20 15-20 Yes Pinus nigra / Austrian Pine M Full 40-60 30-40 - Pinus ponderosa / Ponderosa Pine L Full sun 50-100 20-30 Yes Pinus strobus / Eastern White Pine M Full sun 40 25 - Pinus strobiformis / Southwestern White Pine L Full sun 40-50 20-30 Yes Pinus sylvestris / Scotch Pine M Full sun 30-50 20-30 - Pseudotsuga menziesii / Douglas Fir M Full sun 100 30 Yes Shrubs Deciduous Shrubs Amelanchier alnifolia / Serviceberry Z,L Full - partial 6-10 6-10 Yes Amorpha canescens / Leadplant Z,L Full - partial 4 4 Yes Artemisia filifolia / Sand Sage Z,L Full - partial 3-5 2-3 Yes Artemisia tridentata / Big Sage Z,L Full - partial 6 6 Yes Atriplex canescens / Saltbush Z,L Full - partial 5 4 Yes Berberis thunbergii / Japanese Barberry L Full - partial 3-5 5 - Buddleia davidii nanhoensis / Compact Butterfly Bush M Full sun 4-6 4-5 - Buddleia alternifolia / Silver Fountain Butterfly Bush Z,L Full sun 10 8 - Caragana microphylla / Silver Peashrub Z,L Full sun 10 10 - Caryopteris x clandonensis / Blue Mist Spirea Z,L Full - partial 4 4 - Cercocarpus intricatus / Littleleaf Mountain Mahogany Z,L Full sun 6 5 Yes Cercocarpus montanus / Common Mountain Mahogany Z,L Full sun 6-8 5 Yes Chaenomeles speciosa / Flowering Quince L,M Full - partial 5 5 - Chamaebatiaria millefolium / Fernbush Z,L Full - partial 3-5 3-5 - Chrysothamnus spp. / Rabbitbrush Z,L Full - partial 3-6 3-6 Yes Cornus sericea coloradense / Colorado Red Twig Dogwood M,W Full - partial 6-8 8-10 Yes Cotinus coggygria / Smoke Tree M Full - partial 10 10 - Cotoneaster racemiflorus / Sungari Cotoneaster M Full - partial 10 10 - Cytisus purgans / Spanish Gold Broom L,M Full - partial 2-4 4-6 - Daphne x burkwoodii / Daphne L,M Full - partial 3-4 3-4 - Ephedra equisetina / Bluestem Jointfir Z,L Full - partial 4 5 - Euonymus alata / Burning Bush M Full - partial 10 10 - Fallugia paradoxa / Apache Plume Z,L Full - partial 5 5 Yes Fendlera rupicola / Cliff Fendlerbush Z,L Full - partial 5 5 Yes Forestiera species / New Mexico Privet Z,L Full - partial 8-12 6-10 Yes Frangula alnus 'Columnaris' / Tall Hedge Buckthorn L,M Full sun 8-12 3-4 - Heptacodium miconioides / Seven-son Flower L,M Full - partial 15-20 10-15 - Hesperaloe parviflora / Red Flowering Hesperaloe Z,L Full sun 2-3 2 - Hippophae rhamnoides / Sea-buckthorn Z,L Full - partial 18 12 - Holodiscus dumosus / Rock spirea Z,L Full - partial 4 4 Yes Krascheninnikovia lanata / Winterfat Z,L Full sun 3 3 Yes Ligustrum vulgare / Cheyenne privet Z,L Full - partial 10 6 - Lonicera involcrata / Twinberry Honeysuckle M Partial-shade 3-5 3-6 Yes Philadelphus microphyllus / Littleleaf Mock-orange Z,L Full sun 3-4 3-4 Yes Philadelphus lewisii / Cheyenne Mock-orange Z,L Full sun 6-9 5-8 - Philadelphus x 'Snowbelle' / Snowbelle Mock-orange L Full sun 3-4 3-4 - Physocarpus monogynus / Native Ninebark Z,L,M,W Full - partial 3-4 3-4 Yes Physocarpus opulifolius / Ninebark Z,L,M,W Full - partial 6-10 6-10 Yes Potentilla fruticosa / Potentilla Z,L Full sun 3-4 3-4 Yes Prunus americana / American Plum L,M Full - partial 10 10 Yes Prunus besseyi / Sand Cherry Z,L Full - partial 2-4 4-6 Yes Prunus x cistena / Purple Leaf Plum L,M Full - partial 6-8 4-6 - Purshia tridentata / Antelope Bitterbrush Z,L Full sun 2-6 2-6 Yes Pyracantha spp.