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Plant Setback and Spacing Guide

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Plant Setback and Spacing Guide PLANT SETBACK AND SPACING GUIDE INTRODUCTION This plant list has been developed as an aid in determining the appropriate setback and spacing for plant material used in highway planting projects. The minimum setbacks should not be reduced unless special circumstances or unusual site conditions warrant adjustment. Tree setbacks should not be reduced. All safety requirements must be met including, but not limited to, those set forth in the Highway Design Manual and FHWA guidelines. The on-center spacing of plants is a general recommendation representing distance apart which plants should be spaced when planted. The spacing is based upon the mature growth of the plant material. The distance is set to prevent crowding of plant material the need for pruning when the plants are mature. When filling out the Plant List and Specifications Sheet use capital letters for both botanical and common names. Underline the first three letters of the botanical name (genus and species) to indicate the abbreviations to be used on the planting plans as plant callouts. If a plant has two or more varieties to be used on a project, also underline the first letter(s) of the variety name. This plant list is not intended to represent all acceptable plant materials used on highway planting projects nor does it indicate suitability of plant materials for specific situations. It is only a selection taken from previous projects. When specifying plant material that is not included in the plant list use judgment to select spacing and setback consistent with other species of similar mature growth characteristics Point of measurement Point of measurement ETW (Edge of Traveled Way) EP (Edge of Pavement) Dike TRVD way p u Traveled way) SHLD (Shoulder) pe Slo Level S lope (Sidewalk / Sound Wall), SW dow SHLD (Shoulder), or n TRVD way AC (Asphalt Concrete) (Traveled way) Curb Paved strip Paved ditch Point of measurement Earth ditch FL (Flow Line) SECTION POINTS OF MEASUREMENT - 2 - ALL DISTANCES SHOWN ARE IN FEET BOTANICAL NAME MINIMUM DISTANCE FROM ON CENTER REMARKS COMMON NAME TRVD PVMT FENCE WALL PAVED EARTH WAY DITCH DITCH Abelia 'Edward Goucher' - 6 6 6 6 8 6 SHRUB Goucher Abelia Abelia X grandiflora - 8 6 6 6 8 8 SHRUB Glossy Abelia Acacia melanoxylon 35 - 15 15 10 12 - TREE Blackwood Acacia Acacia pendula 20 - 15 15 15 17 - TREE Weeping Acacia Acacia redolens - 20 20 20 20 22 20 SHRUB Prostrate Acacia Acer macrophyllum 30 - 20 20 20 22 - TREE Big-Leaf Maple Aesculus californica 35 - 20 20 10 12 - TREE California Buckeye Agonis flexuosa 20 - 15 15 15 17 - TREE Peppermint Tree Albizia julibrissin 35 - 20 20 10 12 - TREE Mimosa Alnus cordata 30 - 20 20 10 12 - TREE Italian Alder Alnus oregona 30 - 20 20 10 12 - TREE Red Alder Alnus rhombifolia 30 - 20 20 10 12 - TREE White Alder Aloe arborescens - 8 8 8 8 10 8 SHRUB Tree Aloe Arbutus menziesii 30 - 20 20 20 22 - TREE Pacific Madrone Arbutus unedo - 15 15 15 12 12 10 SHRUB Strawberry Tree Arbutus unedo 'Compacta' - 8 8 8 8 10 6 SHRUB Compact Strawberry Tree Archontophoenix cunninghamiana 30 - 6 6 6 6 - TREE King Palm Arctostaphylos bakeri 'Louis Edmunds' - 6 6 6 6 8 6 SHRUB No common name Arctostaphylos densiflora - 6 6 6 6 8 6 SHRUB 'Howard McMinn' No common name Arctostaphylos edmundsii - 10 10 10 10 12 10 SHRUB Little Sur Manzanita - 2 - ALL DISTANCES SHOWN ARE IN FEET BOTANICAL NAME MINIMUM DISTANCE FROM ON CENTER REMARKS COMMON NAME TRVD PVMT FENCE WALL PAVED EARTH WAY DITCH DITCH Arctostaphylos 'Emerald Carpet' - 8 8 8 8 10 8 GROUND No common name COVER Arctostaphylos hookeri - 6 6 6 6 8 6 SHRUB Hooker Manzanita Arctostaphylos hookeri 'Wayside' - 10 6 6 10 12 10 SHRUB No common name Arctostaphylos 'Pacific Mist' - 8 8 8 8 10 6 SHRUB No common name Arctostaphylos pajaroensis - 6 6 6 6 8 - SHRUB Pajaro Manzanita Arctostaphylos uva-ursi - 8 8 8 8 10 8 GROUND Bearberry COVER Arctostaphylos uva-ursi 'Radiant' - 8 8 8 8 10 8 GROUND No common name COVER Arecastrum romanzoffianum 30 - 6 6 6 6 - TREE Queen Palm Bauhinia blakeana 30 - 15 15 15 17 - SMALL Hong Kong Orchid Tree TREE Berberis thunbergii 'Atropurpurea' - 6 6 6 10 10 6 SHRUB Red Barberry Berberis thunbergii 'Crimson Pygmy' - 6 6 6 6 8 3 SHRUB Crimson Pygmy Barberry Brachychiton acerifolius 30 - 20 20 20 22 - TREE Flame Tree Brachychiton populneus 30 - 15 15 15 17 - TREE Bottle Tree Brahea edulis 20 - 10 10 15 17 - PALM Guadalupe Palm Buddleia davidii - 12 10 10 10 12 10 SHRUB Butterflybush Callistemon citrinus - 15 15 15 15 17 12 SHRUB Lemon Bottlebrush Callistemon viminalis 20 - 15 15 15 17 - TREE Weeping Bottlebrush Calocedrus decurrens 30 - 20 20 20 22 - TREE Incense Cedar Campsis radicans - - - - 10 12 10 VINE Common Trumpet Creeper Carissa macrocarpa - 8 8 8 8 10 5 SHRUB Natal Plum - 3 - ALL DISTANCES SHOWN ARE IN FEET BOTANICAL NAME MINIMUM DISTANCE FROM ON CENTER REMARKS COMMON NAME TRVD PVMT FENCE WALL PAVED EARTH WAY DITCH DITCH Carpenteria californica - 8 8 8 8 10 5 SHRUB Bush Anemone Carpobrotus edulis - 6 6 6 6 8 1.5 GROUND Hottentot Fig COVER Cassia artemisioides - 6 6 6 6 8 6 SHRUB Feathery cassia Casuarina stricta 30 6 15 10 10 12 - TREE Mountain She Oak Catalpa bignonioides 30 20 20 20 12 12 - TREE Indian Bean Ceanothus 'Concha' - 10 8 8 8 10 8 SHRUB No common name Ceanothus cyaneus - 10 10 10 10 12 10 SHRUB San Diego Ceanothus Ceanothus griseus horizontalis - 15 10 6 10 12 6 SHRUB 'Yankee Point' No common name Ceanothus 'Joyce Coulter' - 10 8 8 8 10 8 SHRUB Wild lilac Ceanothus 'Ray Hartman' - 15 15 10 10 12 10 SHRUB No common name Ceanothus thyrsiflorus - 15 15 15 15 17 15 SHRUB Blueblossom Ceanothus verrucosus - 8 8 8 6 8 8 SHRUB Wartstem Ceanothus Cedrus deodara 40 - 30 30 30 32 - TREE Deodar Cedar Celtis occidentalis 30 - 20 20 15 17 - TREE Common Hackberry Celtis sinensis\ 30 10 15 10 10 12 - TREE Chinese Hackberry Cercidium floridum - 15 15 15 15 15 SHRUB Blue Palo Verde Cercidium microphyllum - 15 15 15 15 15 - SHRUB Littleleaf Palo Verde Cercis canadensis 30 - 15 15 15 17 - TREE Eastern Redbud Cercis occidentalis - 15 15 15 15 15 - SHRUB Western Redbud Cercocarpus betuloides - 12 10 10 10 12 10 SHRUB Mountain Mahogany - 4 - ALL DISTANCES SHOWN ARE IN FEET BOTANICAL NAME MINIMUM DISTANCE FROM ON CENTER REMARKS COMMON NAME TRVD PVMT FENCE WALL PAVED EARTH WAY DITCH DITCH Chaenomeles speciosa - 6 6 6 6 8 - SHRUB Flowering Quince Chorisia speciosa 30 - 15 15 15 15 - TREE Floss-Silk Tree Cinnamomum camphora 40 - 30 30 20 22 - TREE Camphor Tree Cistus (All Varieties) - 6 6 6 6 6 6 SHRUB Rock Rose Clytostoma callistegioides - - - - 8 10 10 VINE Violet Trumpet Vine Coprosma X kirkii - 6 6 6 6 8 3 SHRUB No common name Coprosma repens - 10 10 10 10 12 10 SHRUB Mirror Plant Correa pulchella - 4 4 4 4 4 4 SHRUB Australian Fuchsia Cotinus coggygria - 15 15 15 15 17 10 SHRUB Smoke Tree Cotinus coggygria 'Purpureus' - 15 15 15 15 17 10 SHRUB No common name Cotoneaster lacteus - 10 10 10 10 12 10 SHRUB Parney Cotoneaster Cupaniopsis anacardioides 30 - 15 15 15 17 - SMALL Carrotwood TREE Cupressus arizonica glabra 30 - 15 15 15 17 - TREE Smooth Arizona Cypress Cupressus macrocarpa Monterey 30 - 20 20 20 22 - TREE Cypress Delosperma alba - 6 6 6 6 8 1 GROUND White Trailing Iceplant COVER Dendromecon rigida harfordii - 15 15 15 15 17 12 SHRUB Island Bush Poppy Diplacus aurantiacus - 6 6 6 6 8 4 SHRUB Bush Monkey Flower Distictis buccinatoria - - - - 8 10 8 VINE Blood-Red Trumpet Vine Distictis laxiflora - - - - 8 10 8 VINE Vanilla Trumpet Vine Distictis 'Rivers' - - - - 8 10 8 VINE Royal Trumpet Vine - 5 - ALL DISTANCES SHOWN ARE IN FEET BOTANICAL NAME MINIMUM DISTANCE FROM ON CENTER REMARKS COMMON NAME TRVD PVMT FENCE WALL PAVED EARTH WAY DITCH DITCH Elaeagnus pungens - 15 10 10 10 12 10 SHRUB Silverberry Erythrina caffra 40 - 30 20 20 20 - TREE Kaffir Boom Erythrina coralloides 40 - 20 20 20 22 - TREE Naked Coral Tree Erythrina crista-galli 40 - 20 20 20 20 - TREE Cockspur Coral Tree Escallonia exoniensis - 10 8 8 8 10 6 SHRUB No common name Escallonia 'Newport Dwarf' - 5 5 5 5 5 3 SHRUB No common name Escallonia rubra - 10 8 8 8 10 6 SHRUB Red Escallonia Escallonia 'Terri' - 6 6 6 6 6 3 SHRUB No common name Eucalyptus camaldulensis 40 - 20 20 15 17 - TREE Red Gum Eucalyptus citriodora 40 - 30 30 15 17 - TREE Lemon Gum Eucalyptus cladocalyx 40 - 20 20 15 17 - TREE Sugar Gum Eucalyptus erythrocorys 30 - 15 15 15 17 - TREE Red Cap Gum Eucalyptus ficifolia 30 - 15 15 15 17 - TREE Red-Flowering Gum Eucalyptus gunnii 30 - 20 20 20 22 - TREE Cider Gum Eucalyptus nicholii 30 - 15 15 15 17 - TREE Nichol's Peppermint Eucalyptus polyanthemos 30 - 15 15 15 17 - TREE Silver-Dollar Gum Eucalyptus rudis 30 - 20 20 15 17 - TREE Desert Gum Eucalyptus sideroxylon 30 - 15 15 15 17 - TREE Pink Ironbark Eucalyptus spathulata 30 - 15 15 10 12 - TREE Swamp Mallee Eucalyptus viminalis 40 - 20 20 15 17 - TREE Manna Gum - 6 - ALL DISTANCES SHOWN ARE IN FEET BOTANICAL NAME MINIMUM DISTANCE FROM ON CENTER REMARKS COMMON NAME TRVD PVMT FENCE WALL PAVED EARTH WAY DITCH DITCH Euonymus fortunei radicans - 20 20 20 20 22 15 SHRUB Trailing Euonymus Euryops pectinatus - 6 5 5 5 6 3 SHRUB Golden Shrub Daisy Ficus pumila - - - - 10 12 3 VINE Creeping Fig Fraxinus uhdei 40 - 15 15 15 17 - TREE Shamel Ash Fremontodendron 'California Glory' - 15 10 10 10 12 10 SHRUB Flannel Bush Fremontodendron mexicanum - 15 10 10 10 12 10 SHRUB Mexican Flannel Bush Garrya elliptica - 15 10 10 10 12 10 SHRUB Coast Silk-tassel Garrya elliptica 'James Roof' - 15 10 10 10 12 10 SHRUB No common name Gazania rigens leucolaena - 6 6 6 6 8 1 GROUND 'Sunrise Yellow' Gazania COVER Geijera parviflora 30
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