What plant species is noted as a known favorite source for the female's nest lining fiber?

Answer

Lamb's Ear (Stachys byzantina)

The female Wool Carder Bee relies on obtaining specific fuzzy plant fibers to construct the protective lining for each individual brood cell she creates within her nest cavity. A particularly favored source mentioned for this crucial nesting material is the fuzzy leaves of the ornamental plant known as Lamb's Ear, which has the scientific designation Stachys byzantina. This dependency on high-quality, accessible fiber sources influences where females choose to establish their nests and highlights a potential resource vulnerability if such specific host plants are absent in the environment.

What plant species is noted as a known favorite source for the female's nest lining fiber?
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