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Trees and shrubs - Spring

Common name Latin name Blooming months Pollen colour Availability Source for honeybees
Maple Acer spp. Feb - Apr light yellow feral fair
Manitoba Maple (Box elder) Acer negundo Feb - Apr light olive feral good
Norway maple Acer platanoides Apr - May yellow green, olive feral fair
Red Maple Acer rubrum Mar - Apr grey brown feral  
Grey Alder Alnus incana Feb - Apr brownish yellow feral  
American Chestnut Castanea dentata May - Jun   mostly ornamental  
Sweet Chestnut Castanea sativa May   feral good
Common Hackberry Celtis occidentalis Apr - May   feral  
Flowering Quince Chaenomeles japonica, Chaenomeles lagenaria, Chaenomeles speciosa 'Nivalis', Chaenomeles x superba Apr - May   feral good
American Hazel Corylus americana Mar - Apr light green feral and ornamental fair/good
Hawthorn Crataegus spp. Apr - May yellow brown feral fair
White Ash Fraxinus americana Apr - May    
Honey Locust Gleditsia triancanthos May - Jun   feral  
American holly Ilex opaca Apr - Jun   feral  
Walnut Juglans spp. Apr - May   cultivated fair
Tulip-tree Lirodendron tulipifera May - Jun   feral and ornamental good
Crab Apple Malus spp. Mar - Jun light olive ornamental  
Apple Malus domestica, Malus sylvestris Apr - May yellow white cultivated and ornamental very good
American Sycamore Platanus occidentalis Apr - May light olive feral  
Plum Prunus spp. Apr - May light grey, grey ornamental and cultivated  
Almond Prunus amygdalus Feb light brown to brown pollen - not considered a good pollen source but bees are the primary pollinator cultivated mostly in California fair
Wild Cherry Prunus avium Apr - May yellow brown, light brown feral very good
Cherry Plum Prunus cerasifera   light brown to brown feral fair
Sour Cherry Prunus cerasus Apr - May dark yellow ornamental and cultivated very good
Peach Prunus persica Apr - May reddish yellow ornamental and cultivated good
Black Cherry Prunus serotina Apr - May   feral minor
Blackthorn Prunus spinosa     feral good
Pear Pyrus communis Apr - May red yellow ornamental and cultivated good
Oak Quercus spp. May   feral  
Oak Quercus robur, Quercus pedunculata May light olive feral minor
Black Locust Robinia pseudoacacia May - Jun   feral  
Blackberry Rubus spp. May - Jun light grey feral and cultivated  
Raspberry Rubus idaeus May - Jun white grey feral and cultivated good
Willow Salix spp. Feb - Apr lemon feral good
White Willow Salix alba     feral good
Goat Willow Salix caprea Mar - Apr   feral very good
Violet Willow Salix daphnoides Mar - Apr   feral very good
Pussy Willow Salix discolor Mar - Apr   feral and ornamental  
Basket Willow Salix purpurea Mar - Apr   feral very good
Silky leaf osier, Smith's Willow Salix x smithiana Apr - May     very good
American mountain ash Sorbus americana May-Jun   feral  
American Elm Ulmus americana Feb - Apr light grey feral  
Winged Elm Ulmus alata Feb - Mar pale yellow feral good
Europea field elm Ulmus americana     feral good

 

Flowers and annual crop plants - Spring

Common name Latin name Blooming months Pollen color Availability Source for honeybees
Ajuga (Bronze Bugle, Common Bugle) Ajuga reptans mid spring      
Chives Allium schoenoprasum May - Sep   cultivated?  
Asparagus Asparagus officinalis May - Jun bright orange cultivated  
Mustard Brassica arvenisi Apr - May lemon cultivated and feral  
Canola Brassica napus May - Jun lemon extensively cultivated very good
Yellow Crocus Crocus vernus (syn. Crocus aureus) April orange yellow feral and ornamental fair
Leopard's Bane Doronicum cordatum Apr - May      
Winter aconite Eranthis hyemalis Mar - Apr yellow feral and ornamental good
Snowdrop Galanthus nivalis Mar - Apr orange, red   fair
Henbit Lamium amplexicaule April orange red, red, purplish red Apr - Jul poor
White Sweet Clover Melilotus alba May - Aug yellow to dark yellow feral and cultivated good
Yellow Sweet Clover Melilotus officinalis May - Aug yellow to dark yellow feral and cultivated  
Sainfoin Onobrychis viciifolia May - Jul yellow brown   very good
Siberian squill Scilla sibirica Mar - Apr steel blue feral and ornamental good
White mustard Sinapis alba June lemon feral and cultivated good
Chick weed Stellaria media Apr - Jul yellowish feral minor
Dandelion Taraxacum officinale Apr - May red yellow, orange feral very good

Flowers and annual crop plants - Spring

Common name↓ Latin name↓ Blooming months↓ Pollen color↓ Availability↓ Source for honeybees↓
Ajuga (Bronze Bugle, Common Bugle) Ajuga reptans mid spring      
Chives Allium schoenoprasum May - Sep   cultivated?  
Asparagus Asparagus officinalis May - Jun bright orange cultivated  
Mustard Brassica arvenisi Apr - May lemon cultivated and feral  
Canola Brassica napus May - Jun lemon extensively cultivated very good
Yellow Crocus Crocus vernus (syn. Crocus aureus) April orange yellow feral and ornamental fair
Leopard's Bane Doronicum cordatum Apr - May      
Winter aconite Eranthis hyemalis Mar - Apr yellow feral and ornamental good
Snowdrop Galanthus nivalis Mar - Apr orange, red   fair
Henbit Lamium amplexicaule April orange red, red, purplish red Apr - Jul poor
White Sweet Clover Melilotus alba May - Aug yellow to dark yellow feral and cultivated good
Yellow Sweet Clover Melilotus officinalis May - Aug yellow to dark yellow feral and cultivated  
Sainfoin Onobrychis viciifolia May - Jul yellow brown   very good
Siberian squill Scilla sibirica Mar - Apr steel blue feral and ornamental good
White mustard Sinapis alba June lemon feral and cultivated good
Chick weed Stellaria media Apr - Jul yellowish feral minor
Dandelion Taraxacum officinale Apr - May red yellow, orange feral very good

Summer

Trees and shrubs - Summer

Common name↓ Latin name↓ Blooming months↓ Pollen color↓ Availability↓ Source for honeybees↓
Red Horse chestnut Aesculus carnea   raisin [3] feral  
Horse chestnut Aesculus hippocastanum May - Jun after 80-110 growing degree days. anatolia [3] feral good
Southern Catalpa Catalpa bignonioides Jun - Jul   ornamental fair
Northern Catalpa Catalpa speciosa Jun - Jul   ornamental  
Bluebeard Caryopteris x clandonensis 'Heavenly Blue' Aug - Sep     very good
Virginia creeper Parthenocissus quinquefolia Jul - Aug     good
Boston Ivy 'Veitchii' Parthenocissus tricuspidata 'Veitchii' Jun - Jul     good
Sumac Rhus glabra Jun - Jul      
Elder Sambucus canadensis Jun - Jul canary yellow [3]    
Basswood or American Linden Tilia americana Jun - Jul yellow to light orange feral and ornamental  
Little Leaf Linden Tilia cordata   citrine [3] feral  
Blueberry Vaccínium myrtíllus Jun red yellow, orange cultivated poor

Flowers and annual crop plants - Summer

Common name↓ Latin name↓ Blooming months↓ Pollen color↓ Availability↓ Source for honeybees↓
Allium Allium spp.     feral and cultivated  
Onion Allium cepa   light olive cultivated  
Chives Allium schoenoprasum May - Sep   feral and cultivated  
Garlic chives Allium tuberosa Aug - Sep   feral and cultivated  
Leadwort syn. Indigobush Amorpha fruticosa Jun - Jul   ornamental?  
Aster Aster spp. Sep-Frost reddish yellow feral and ornamental  
Land-in-blue, Bushy Aster Aster x dumosus Aug - Sep bronze yellow [3] feral  
Borage Borago officinalis Jun - Frost   ornamental  
Marigold Calendula officinalis Jun - Sep      
Heather Calluna vulgaris Jul - Aug     good
Hemp Cannabis sativa Aug yellow green   good source
Blue Thistle Carduus spp.        
Star thistle Centaurea spp. Jul - Sep      
Persian centaurea Centaurea dealbata   hemp [3]    
Knapweed Centaurea macrocephala Jul - Aug     good
Knapweed Centaurea nigra   very light olive    
Chicory Cichorium intybus L.   white    
Cotoneaster Cotoneaster spp.       good
Cucumber Cucumis spp.   pale yellow cultivated  
Melons Cucumis melo Jun-Frost pale yellow cultivated  
Pumpkin Cucurbita pepo Jun-Frost bright yellow cultivated  
Fireweed Epilobium angustifolium Jul - Aug blue feral  
Joe-Pye weed, Bluestem Eutrochium spp.; Eupatorium purpureum Aug - Sep bistre green    
Buckwheat Fagopyrum esculentum Jul - Aug light yellow to light green cultivated good source
Blue vine Gonolobus laevis syn. Cynanchum laeve        
Sunflower Helianthus annuus Jun - Sep golden feral and cultivated  
Jewelweed Impatients capensis   yellowish white    
Alyssum Lobularia maritima Jun - Sep      
Mallow Malva alcea Jun - Sep      
Alfalfa Medicago sativa July - Aug khaki [3] feral and cultivated  
Clover Melilotus spp. and Trifolium spp. May - Aug   feral and cultivated  
White Sweet Clover Melilotus alba   auburn [3] feral and cultivated  
Yellow Sweet Clover Melilotus officinalis   auburn [3] feral and cultivated  
Basil Ocimum basilicum     ornamental  
Poppy Papaver somniverum May - Jun grey feral and ornamental very good source
Smartweed Polygonum spp. Aug - Sep      
Chickweed Stellaria media Apr - Jul     minor source
Germander Teucrium chamaedrys Jul - Aug      
Alsike Clover Trifolium hybridum   yellow brown   good source
Crimson Clover Trifolium incarnatum   dark brown    
White Clover Trifolium repens Jun - Jul caledonian brown   good source
Cat-tail Typha latifolia Jun - Jul      
Common vetch[verification needed] Vicia cracca Jul - Aug      
Spring Vetch[verification needed] Vicia sativa Jul - Aug      
Sweet Corn Zea mays Jun - Jul yellowish white cultivated  

Trees and shrubs - Autumn

Common name Latin name Blooming months Pollen color Availability Source for honeybees
Chinese Elm, Lacebark Elm Ulmus parvifolia Aug - Sep   ornamental good

Flowers and annual crop plants - Autumn

Common name Latin name Blooming months Pollen color Availability Source for honeybees
Aster Aster spp. Sep-Frost reddish yellow    
Borage Borago officinalis Jun - Frost      
Melons Cucumis melo Jun-Frost   cultivated  
Sweet autumn clematis Clematis ternifolia late Sept white ornamental  
Pumpkin Cucurbita pepo Jun-Frost bright yellow cultivated  
Ivy Hedera spp. Sep - Oct dull yellow or black? ornamental  
Goldenrod Solidago spp. Sep - Oct golden feral