List of pollen sources

The term pollen source is often used in the context of beekeeping and refers to flowering plants as a source of pollen for bees or other insects. Bees collect pollen as a protein source to raise their brood. For the plant, the pollinizer, this can be an important mechanism for sexual reproduction, as the pollinator distributes its pollen. Few flowering plants self-pollinate; some can provide their own pollen (self fertile), but require a pollinator to move the pollen; others are dependent on cross pollination from a genetically different source of viable pollen, through the activity of pollinators. One of the possible pollinators to assist in cross-pollination are honeybees. The article below is mainly about the pollen source from a beekeeping perspective.

Bee collecting pollen from rata
Pollen-laden bees at hive entrance
Bee on plum tree with pollen

The pollen source in a given area depends on the type of vegetation present and the length of their bloom period. What type of vegetation will grow in an area depends on soil texture, soil pH, soil drainage, daily maximum and minimum temperatures, precipitation, extreme minimum winter temperature, and growing degree days. The plants listed below are plants that would grow in USDA Hardiness zone 5. A good predictor for when a plant will bloom and produce pollen is a calculation of the growing degree days.

The color of pollen below indicates the color as it appears when the pollen arrives at the beehive. After arriving to the colony with a fresh load of pollen, the honey bee unloads its pollen from the pollen basket located on its hind legs. The worker bees in the colony mix dry pollen with nectar and/or honey with their enzymes, and naturally occurring yeast from the air. Workers then compact the pollen. storing each variety in an individual wax hexagonal cell (honeycomb), typically located within their bee brood nest. This creates a fermented pollen mix call beekeepers call 'bee bread'. Dry pollen, is a food source for bees, which may contain 16–30% protein, 1–10% fat, 1–7% starch, many vitamins, some micro nutrients, and possibly a little sugar. The protein source needed for rearing one worker bee from larval to adult stage requires approximately 120 to 145 mg of pollen. An average bee colony will collect about 20 to 57 kg (44 to 125 pounds) of pollen a year.[1][2]

Spring

Trees and shrubs – Spring
Common name Latin name Blooming months Pollen color 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 cream 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 Mar – May firebrick 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
European field elm Ulmus minor 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 (Oilseed Rape) 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
Common Mallow Malva sp. Apr – Sep mauve feral good
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
Gorse Ulex europaeus Mar – Dec light firebrick feral 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 blueish grey ornamental
Marigold Calendula officinalis Jun – Sep orange
Heather sp. Calluna vulgaris Jul – Aug yellow white, white 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[4] 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 (Rosebay Willowherb) 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
Lupin Lupinus sp. Jun – Jul white, yellow or blue minor
Mallow Malva sylvestris 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 white ornamental
Poppy Papaver orientale May – Jul blueish grey ornamental only good source [5]
Opium poppy Papaver somniferum May – Jun grey feral and ornamental very good source
Phacelia Phacelia tanacetifolia Jun – Sep navy blue feral and cultivated good source
Smartweed Polygonum spp. Aug – Sep
Common 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 Vicia cracca Jul – Aug
Spring Vetch Vicia sativa Jul – Aug
Sweet Corn Zea mays Jun – Jul yellowish white cultivated

Fall

Trees and shrubs – Fall
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 – Fall
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? feral and ornamental
Goldenrod Solidago spp. Sep – Oct golden feral

[6][7][8][9][10]

See also

References
  1. THE R-VALUES OF HONEY: POLLEN COEFFICIENT Archived 2006-07-24 at the Wayback Machine accessed Feb 2005
  2. Reiter, R, THE COLORATION OF ANTHER AND CORBICULAR POLLEN, THE OHIO JOURNAL OF SCIENCE, VOL. XLVII JULY, 1947 No. 4, Camden, N. J.
  3. https://kb.osu.edu/dspace/bitstream/1811/3589/1/V47N04_137.pdf
  4. Legan, Christiaan (2012-07-21), mmm... chicory, retrieved 2019-07-18
  5. Die Honig Macher ( in German )
  6. Bienenweide Arbeitsblatt 207, Bieneninstitut Kirchhain, 2001
  7. Tew, James Some Ohio Nectar and Pollen Producing Plants Ohio State University Extension Fact Sheet, 2000
  8. Stahlman, Dana Honey Plants Flowering Plants/Trees 2004
  9. Hodges, Dorothy; The pollen loads of the honeybee, Bee Research Association Limited, London, 1952
  10. Lamp, Thomas; Bienennährpflanzen 1 : Gehölze Nov 1999; accessed 05/2005
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