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The blue flowers of flax open anew every morning and drop their petals towards midday. Nectar glands at the base secrete small amounts of nectar; honey bees collect both nectar and pollen in the morning hours. The plant is largely self-pollinating; bee visits make a limited but positive contribution to seed yield.
In June-July depending on sowing date, lasting about 2-3 weeks in the field. Bee visits are heavy on sunny mornings until about 10-11 o'clock; in the afternoon the field is almost deserted.
No flax honey is produced; on large sown areas it makes a small contribution to mixed summer honey.
Flax is not a flow source on its own, but in regions where oilseed flax is widely grown it provides pollen diversity in early summer. When assessing it for your bees, bear in mind that visits happen very early in the day.