Why might mesh 'thistle socks' cause problems for goldfinches?
Answer
The mesh can hold moisture, encouraging mold growth inside the seed supply
Although marketed specifically for thistle seed, mesh or 'thistle sock' feeders present potential issues related to moisture management and stability. The woven, mesh-like material inherently retains moisture, creating an environment conducive to the development of mold and mildew within the stored Nyjer seed supply. Furthermore, for some goldfinches, the loose or soft nature of the mesh netting does not provide the stable, firm gripping surface that they prefer for feeding, especially when they are in competition or trying to stabilize themselves.
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