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Parsley is a Mediterranean biennial; fields grown for leaves are harvested before flowering and provide no forage for bees. Seed plants send up a flowering stem in the spring of their second year and open umbels of small yellowish-green flowers. Nectar is secreted openly; honey bees and flies visit. Its nectar contribution is moderate and its pollen contribution low.
Between June and July, for about 4-5 weeks.
There is no monofloral honey.
Parsley flowers also pass first through a male and then a female stage, so insect visits are important for seed set. Keeping colonies in seed fields for pollination can increase yield. Leaving a few plants in the garden to flower in their second year provides a small extra source in early summer.