OAK GALLS
Oak Galls

OAK WILT
Oak Wilt

OAK-LEAVED HYDRANGEA
Hydrangea quercifolia--Oak-leaved Hydrangea

OAKLEAF MOUNTAIN ASH
Sorbus thuringiaca--Oakleaf Mountain Ash

OAKS
Quercus acutissima--Sawtooth Oak
Quercus alba--White Oak
Quercus bicolor--Swamp White Oak
Quercus cerris--Turkey Oak
Quercus coccinea--Scarlet Oak
Quercus ellipsoidalis--Northern Pin Oak
Quercus frainetto--Italian Oak
Quercus gambelii--Gambel Oak
Quercus imbricaria--Shingle Oak
Quercus lobata--California White Oak
Quercus macrocarpa--Burr Oak
Quercus muehlenbergii--Chinkapin Oak
Quercus palustris--Pin Oak
Quercus phellos--Willow Oak
Quercus prinus--Chestnut Oak
Quercus robur--English Oak
Quercus velutina--Northern Black Oak
Quercus shumardii--Shumard Oak
Quercus Insect Problems
Quercus Disease Problems
Anthracnose
Oak Wilt

OBLIQUE-BANDED LEAF ROLLER
Cotinus Insect Problems
Spiraea Insect Problems

OCIMUM BASILICUM
Ocimum basilicum--Sweet Basil

OCTOBER DAPHNE
Sedum sieboldii--October Daphne

OEDEMA
Acalypha Diseases Problems
Begonia Disease Problems - Indoors
Ficus Disease Problems
Pelargonium Disease Problems - Indoors
Peperomia Disease Problems

OENOTHERA
Oenothera Insect Problems
Oenothera Disease Problems

OENOTHERA BERLANDERI
Oenothera speciosa--Showy Evening Primrose

OENOTHERA FREEMONTII
Oenothera fruticosa--Sundrops

OENOTHERA FRUTICOSA
Oenothera fruticosa--Sundrops

OENOTHERA MISSOURIENSIS
Oenothera missouriensis--Ozark Sundrop

OENOTHERA SPECIOSA
Oenothera speciosa--Showy Evening Primrose

OHIO BUCKEYE
Aesculus glabra--Ohio Buckeye

OKAME FLOWERING CHERRY
Prunus incisa--Fuji Cherry

OLD FASHIONED WEIGELA
Weigela florida--Old Fashioned Weigela

OLEANDER
Nerium--Oleander
Nerium Insect Problems - Indoors

OMPHALODES CAPPADOCICA
Omphalodes cappadocica

OMPHALODES VERNA
Omphalodes verna--Creeping Forget-Me-Not

ONION THRIPS
Asparagus Insect Problems

ONIONS
Allium aflatunense--Purple Allium
Allium caeruleum--Blue Globe Onion
Allium giganteum--Giant Allium
Allium moly--Golden Garlic
Allium neapolitanum--Naples Onion
Allium oreophilum--Alpine Rosy Bells
Allium roseum grandiflorum--Bigflower Rosy Onion
Allium Disease Problems

ONOCLEA SENSIBILIS
Onoclea sensibilis--Sensitive Fern

OPHIOPOGON JAPONICUS
Ophiopogon japonicus--Dwarf Mondo Grass

OPHIOPOGON PLANISCAPUS
Ophiopogon planiscapus--Black Mondo Grass

OPUNTIA COMPRESSA
Opuntia humifusa--Hardy Prickly Pear Cactus

OPUNTIA HUMIFUSA
Opuntia humifusa--Hardy Prickly Pear Cactus

ORANGE CONEFLOWER
Rudbeckia fulgida--Orange Coneflower

ORANGE COSMOS
Cosmos sulphureous--Orange Cosmos

ORANGE-STRIPED OAKWORM
Corylus Insect Problems

ORCHID PRIMROSE
Primula vialli--Orchid Primrose

ORCHID WEEVIL
Phaleanopsis Insect Problems

ORCHID WEEVILS
Cattleya Insect Problems

ORCHIDS
Cattleya Orchid
Paphiopedilum
Paphiopedilum Insect Problems
Paphiopedilum Disease Problems
Phaleanopsis--Moth Orchid

OREGON ASH
Fraxinus latifolia--Oregon Ash

OREGON FLEABANE
Erigeron speciosus--Oregon Fleabane

OREGON GRAPE HOLLY
Mahonia aquifolium--Oregon Grape Holly

ORGANIC MATTER
Soil Organic Matter

ORGANIC MULCHES
Organic Mulches

ORIENTAL ARBORVITAE
Thuja orientalis--Oriental Arborvitae

ORIENTAL CHERRY
Prunus serrulata--Oriental Cherry

ORIENTAL HORNBEAM
Carpinus orientalis--Oriental Hornbeam

ORIENTAL POPPY
Papaver orientale--Oriental Poppy

ORIENTAL SPRUCE
Picea orientalis--Oriental Spruce

ORIGANUM LAEVIGATUM
Origanum laevigatum--Garden Oregano

ORIGANUM VULGARE
Origanum vulgare--Pot Marjoram

ORNAMENTAL BARK
Acer buergerianum--Trident Maple
Acer capillipes
Acer davidii--David's Maple
Acer griseum--Paperbark Maple
Acer grosseri--Snake-skin Maple
Acer pensylvanicum--Striped Maple
Acer triflorum--Threeflower Maple
Betula x 'Avalzam'--Avalzam Birch
Betula utilis--White-barked Himalayan Birch
Betula lenta--Sweet Birch
Betula nigra--River Birch
Betula occidentalis--Water Birch
Betula papyrifera--Paper Birch
Betula pendula--European Birch
Betula platyphylla japonica 'Whitespire'
Betula x 'Crimson Frost'
Carpinus caroliniana--American Hornbeam
Carya ovata--Shagbark Hickory
Chionanthus retusus--Chinese Fringe Tree
Clethra barbinervis--Japanese Clethra
Cornus alba--Tatarian Dogwood
Cornus baileyi--Bailey Red Twig Dogwood
Cornus officinalis--Japanese Cornel
Cornus sericea (stolonifera)--Red Twigged Dogwood
Cryptomeria japonica--Japanese Cedar
Deutzia scabra--Fuzzy Deutzia
Fagus crenata--Japanese Beech
Fagus grandiflora--American Beech
Fagus sylvatica--European Beech
Halesia monticola--Mountain Silverbell
Hydrangea anomala subsp. petiolaris
Kalopanax septemlobus--Castor Aralia
Maackia amurensis--Amur Maackia
Parrotia persica--Persian Parrotia
Phellodendron amurense--Amur Corktree
Pinus albicaulis--Whitebark Pine
Pinus bungeana--Lacebark Pine
Pinus densiflora--Japanese Red Pine
Platanus x acerifolia--London Planetree
Platanus occidentalis--Sycamore
Prunus maacki--Amur Chokecherry
Prunus serrula
Salix 'Flame'
Salix x 'Golden Curls'
Salix x 'Prairie Cascade'--Prairie Cascade Willow
Salix purpurea--Purpleosier Willow
Salix x 'Scarcuzam'('Scarlet Curls')
Stewartia koreana--Korean Stewartia
Stewartia pseudocamellia--Japanese Stewartia
Ulmus parvifolia--Lacebark Elm

ORNAMENTAL FRUITS
Acer circinatum--Vine Maple
Acer ginnala--Amur Maple
Acer tataricum--Tatarian Maple
Amelanchier alnifolia--Saskatoon Serviceberrry
Amelanchier arborea--Downy Serviceberry
Amelanchier canadensis--Shadblow Serviceberry
Amelanchier x grandiflora--Apple Serviceberry
Amelanchier laevis--Allegheny Serviceberry
Amelanchier lamarckii--Lamarcki Serviceberry
Ampelopsis brevipedunculata--Porcelain Berry
Arctostaphylos uva-ursi--Bearberry
Arisaema triphyllum--Jack-In-The-Pulpit
Aronia arbutifolia--Red Chokeberry
Aronia melanocarpa--Black Chokeberry
Aronia x prunifolia--Purple Chokeberry
Belamcanda chinensis--Blackberry Lily
Berberis julianae--Wintergreen Barberry
Berberis koreana--Korean Barberry
Berberis x 'Tara'--Emerald Carousel Barberry
Berberis thunbergii--Japanese Barberry
Callicarpa bodinieri--Bodinier Beautyberry
Callicarpa dichotoma--Purple Beautyberry
Callicarpa japonica--Japanese Beautyberry
Capsicum annuum--Ornamental Pepper - Outdoors
Capsicum--Ornamental Pepper - Indoors
Carissa grandiflora--Natal Plum
Celastrus scandens--American Bittersweet
Chaenomeles japonica--Japanese Flowering Quince
Chaenomeles speciosa--Flowering Quince
Clematis tangutica--Golden Clematis
Clerodendrum trichotomum--Harlequin Glorybower
Coix lacryma-jobi--Job's Tears
Convallaria majalis--Lily-of-the-Valley
Cornus baileyi--Bailey Red Twig Dogwood
Cornus canadensis--Bunchberry
Cornus controversa--Giant Dogwood
Cornus florida--Flowering Dogwood
Cornus kousa--Kousa Dogwood
Cornus mas--Cornelian Cherry
Cornus officinalis--Japanese Cornel
Cornus racemosa--Gray Dogwood
Cornus sanguineum--Bloodtwig Dogwood
Cornus sericea (stolonifera)--Red Twigged Dogwood
Cotoneaster acutifolius--Peking Cotoneaster
Cotoneaster adpressus--Creeping Cotoneaster
Cotoneaster apiculatus--Cranberry Cotoneaster
Cotoneaster congestus--Pyrenees Cotoneaster
Cotoneaster dammeri--Bearberry Cotoneaster
Cotoneaster divaricatus--Spreading Cotoneaster
Cotoneaster horizontalis--Rock Cotoneaster
Cotoneaster lucidus--Hedge Cotoneaster
Cotoneaster microphyllus--Little-leaf Cotoneaster
Cotoneaster multiflorus--Many-flowered Cotoneaster
Cotoneaster salicifolius--Willowleaf Cotoneaster
Crataegus ambigua--Russian Hawthorn
Crataegus arnoldiana--Arnold Hawthorn
Crataegus coccinoides--Kansas Hawthorn
Crataegus crus-galli--Cockspur Hawthorn
Crataegus laevigata--English Hawthorn
Crataegus x lavelli--Lavelle Hawthorn
Crataegus mollis--Downy Hawthorn
Crataegus monogyna--Singleseed Hawthorn
Crataegus x mordenensis
Crataegus phaenopyrum--Washington Hawthorn
Crataegus pinnatifida
Crataegus pruinosa--Frosted Hawthorn
Crataegus punctata--Dotted Hawthorn
Crataegus succulenta--Fleshy Hawthorn
Crataegus viridis--Green Hawthorn
Cucurbita pepo--Ornamental Gourds
Decaisnea fargesii--Blue Bean
Dolichos lablab--Hyacinth Bean
Eleagnus x ebbingii--Ebbinges Silverberry
Eleagnus umbellata--Autumn Olive
Euonymus alatus--Burning Bush
Euonymus bungeanus--Winterberry Euonymus
Euonymus europaeus--Spindle Tree
Euonymus hamiltonianus var. maacki--Maacki Euonymus
Euonymus hamiltonianus ssp. sieboldianus
Euonymus sachalinensis
Evodia danielli--Korean Evodia
Gaultheria procumbens--Wintergreen
Hippophae rhamnoides--Common Sea Buckthorn
Ilex x aquipernyi
Ilex decidua--Possumhaw
Ilex glabra--Inkberry
Ilex x meserveae--Blue Holly
Ilex opaca--American Holly
Ilex pedunculosa--Longstalk Holly
Ilex verticillata--Winterberry
Iris foetidissima--Gladwyn (Gladwin) Iris
Juniperus virginiana--Eastern Red Cedar
Kalopanax septemlobus--Castor Aralia
Koelreuteria paniculata--Panicled Goldenraintree
Lonicera korolkowii--Blueleaf Honeysuckle
Lonicera maackii--Amur Honeysuckle
Lonicera maximowiczii var. sachalinensis
Lonicera morrowii--Morrow Honeysuckle
Lonicera pileata--Privet Honeysuckle
Lonicera sempervirens--Trumpet Honeysuckle
Lonicera tatarica--Tatarian Honeysuckle
Maclura pomifera--Osage Orange
Magnolia tripetala--Umbrella Magnolia
Mahonia aquifolium--Oregon Grape Holly
Mahonia bealei--Leatherleaf Mahonia
Mahonia repens--Creeping Mahonia
Malus--Crab Apple
Malus Cultivar List A - C
Malus Cultivar List D - N
Malus Cultivar List O - R
Malus Cultivar List S - Z
Myrica pennsylvanica--Northern Bayberry
Nandina domestica--Heavenly Bamboo
Ophiopogon japonicus--Dwarf Mondo Grass
Ophiopogon planiscapus--Black Mondo Grass
Physocarpus opulifolius--Common Ninebark
Prunus americana--American Plum
Prunus besseyi--Western Sand Cherry
Prunus maritima--Beach Plum
Prunus nigra--Canada Plum
Prunus tenella--Dwarf Russian Almond
Prunus tomentosa--Nanking Cherry
Prunus virginiana--Chokecherry
Pyracantha coccinea--Firethorn
Rhodotypos scandens--Black Jetbead
Rhus aromatica--Fragrant Sumac
Rhus typhina--Staghorn Sumac
Rubus phoenicolasius--Wineberry
Sambucus caerulea--Blueberry Elder
Sambucus canadensis--Elderberry
Sambucus nigra--European Elder
Sambucus pubens--Scarlet Elder
Sambucus racemosa--European Red Elder
Sassafras albidum--Sassafras
Schisandra chinensis--Magnolia Vine
Shepherdia argentea--Silver Buffaloberry
Sorbus alnifolia--Korean Mountain Ash
Sorbus americana--American Mountain Ash
Sorbus aucuparia--European Mountain Ash
Sorbus decora--Showy Mountain Ash
Sorbus hupehensis
Sorbus x hybrida
Sorbus meinichii--Meinichii Mountain Ash
Sorbus rufoferruginea
Sorbus thuringiaca--Oakleaf Mountain Ash
Sorbus tianshanica
Symphoricarpos albus--Common Snowberry
Symphoricarpos x chenaultii--Chenault Coralberry
Symphoricarpos x doorenbosii
Symphoricarpos orbiculatus--Indiancurrent Coralberry
Taxus baccata--English Yew
Taxus canadensis--Canadian Yew
Taxus cuspidata--Japanese Yew
Taxus x media--Anglojap Yew
Vaccinium angustifolium--Lowbush Blueberry
Vaccinium corymbosum--Highbush Blueberry
Vaccinium macrocarpon--American Cranberry
Vaccinium oxycoccos--European Cranberry
Vaccinium moupinense--Himalayan Blueberry
Viburnum burejaeticum--Manchurian Viburnum
Viburnum x burkwoodii--Burkwood Viburnum
Viburnum x carcephalum--Fragrant Snowball
Viburnum carlesi--Korean Spice Viburnum
Viburnum cassinoides--Witherod Viburnum
Viburnum dentatum--Arrowwood
Viburnum dilitatum--Linden Viburnum
Viburnum x 'Emerald Triumph'
Viburnum farreri--Fragrant Viburnum
Viburnum x juddii
Viburnum lantana--Wayfaring Tree
Viburnum lentago--Nannyberry
Viburnum molle--Kentucky Viburnum
Viburnum nudum 'Winterthur'
Viburnum opulus--European Cranberrybush
Viburnum plicatum f. tomentosum
Viburnum prunifolium--Blackhaw Viburnum
Viburnum rhytidophyllum--Leatherleaf Viburnum
Viburnum x rhytidophylloides
Viburnum rufidulum--Southern Viburnum
Viburnum sargentii--Sargent Viburnum
Viburnum setigerum--Tea Viburnum
Viburnum sieboldii--Siebold Viburnum
Viburnum trilobum--American Cranberrybush
Viburnum utile--Service Viburnum
Viburnum wrightii--Wright Viburnum
Zanthoxylum simulans--Flatspine Prickly-ash

ORNAMENTAL GOURDS
Cucurbita pepo--Ornamental Gourds

ORNAMENTAL SEA KALE
Crambe cordifolia--Ornamental Sea Kale

ORNITHOGALUM THYRSOIDES
Ornithogalum thyrsoides--Chincherinchee

ORNITHOGALUM UMBELLATUM
Ornithogalum umbellatum--Star-of-Bethlehem

OSAGE ORANGE
Maclura pomifera--Osage Orange

OSMUNDA CINNAMOMEA
Osmunda cinnamomea--Cinnamon Fern

OSMUNDA REGALIS
Osmunda regalis--Royal Fern

OSTEOSPERMUM
Osteospermum

OSTRICH FERNS
Matteuccia struthiopteris--Ostrich Fern

OSTRYA
Ostrya Insect Problems
Ostrya Disease Problems

OSTRYA VIRGINIANA
Ostrya virginiana--American Hophornbeam

OXALIS
Oxalis--Shamrock
Oxalis Insect Problems - Indoors

OXALIS ADENOPHYLLA
Oxalis adenophylla--Chilean Wood Sorrel

OXYDENDRUM
Oxydendrum Disease Problems

OXYDENDRUM ARBOREUM
Oxydendrum arboreum--Sourwood

OYAMA MAGNOLIA
Magnolia sieboldi--Oyama Magnolia

OYSTERSHELL SCALE
Celastrus Insect Problems
Cotoneaster Insect Problems
Hydrangea Insect Problems - Outdoors
Oystershell Scale

OZARK SUNDROP
Oenothera missouriensis--Ozark Sundrop
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