The bees have been bringing in a bright yellow pollen recently and I think I discovered its source. A neighbor two blocks away has a bed of coreopsis grandiflora growing near his/her curb. The flowers have attracted a number of different pollinators as can be seen in the photo.
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Coreopsis are valuable for dying fibers. They can give (depending on variety of flower, and whether flower tops alone or a mixture of tops and stems/leaves are used) a range of yellows, oranges and olive greens.
They work best if harvested before any frost and not allowed to dry out. It is very much a summer-time dye.
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