
Its small fragrant flowers give bees pollen, mostly in the morning, but little nectar; heavy spraying in vineyards calls for caution.
The small, greenish, fragrant flowers of the grapevine are largely self- and wind-pollinated. When the petals drop off like a cap, the exposed anthers release plenty of pollen; bees come for pollen especially in the cool of the morning. Very little nectar is secreted by the glands at the base of the flower.
It flowers in late May to early June for 1-2 weeks, depending on region and variety. In large vineyard areas this short period supplies colonies with a notable amount of pollen.
The grapevine yields no honey. At harvest time bees may take juice from split berries that birds or wasps have pierced; they cannot pierce intact berries. This juice ferments easily and is not suitable as winter food.
Vineyards are sprayed frequently against downy mildew and the grape berry moth. In wine-growing areas, place hives in consultation with the growers and take the flight path into account on spraying days.