These are pokeberries. The grow in the alley behind my apartment (many things grow in the alley. Many things that have been used to dye yarn). Using an alum mordant and this many pokeberries (sorry I don't have numbers), I dyed this yarn.
I like sock yarn that has nuances to add depth to the sock patterns. This yarn has those nuances and some cat hair.
I've been wildcrafting a lot of dyes here. I'll post some yarn I've over-dyed several times. The over-dyeing gives a depth to the yarn I love.