anyone know if there is information?
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OK. I have nursed bees 42 years and I am master of science in biology. I know quite well Finnish pollen colors. But in south there are more numerous of flowers.
In southern Finland
Alnus incana April light yellow
Willows, about 15 different species in May yellow (40 in botany book)
Pine light yellow
Oxalis acetosella, white, like snowball
Taraxacum, orange
Apple tree , green grey
Cherry , brown
Vaccinium vitis-idaea, rusty red
Vicia cracca , yellow brown
Trifolium , brown
turnip rape , yellow
willow herb, Chamaenérium angustifólium blue with fringe
raspberry , Rubus idaeus , grey white
heather, like skin, light brown
Leontodon autumnalis, August, orange
lime tree, Tilia cordata, green grey
These are main honey & pollen plants in Finland, or mass flowers. There is a lot of bowers, but they meaning to apiculture is unimportant.
For excample, willow herb is the main honey palnt in forest areas. Last summer was so hot, that it did not give any honey or pollen in my area.
Also we can have many hectares Pisum sativum, but bees do not go to flowers.
One year I wondered when bees brought turnip rape pollen. I drived car many hours and I did not found the field. But after couple of days I found it. It was 4,5 km distance to field.
When bees get honey from turnip rape over distance 1 km, half of honey is consumed during journey. Also it dipence on water content of honey.