I don't know if this is a result of different semantics or biology (actually different colours around here), but: I live in Bulgaria. Terms for yellow, brown,

I don't know if this is a result of different semantics or biology (actually different colours around here), but: I live in Bulgaria. Terms for yellow, brown, orange and red are pretty much alike English in their semantic meaning. Still, the grass during high summer (not autumn) is definitely "yellow" (as the sunflower). So are fields with wheat crops when they mature. And this is nothing alike the "brown" of the tree trunks. Leafs of the trees become yellow, brown, red or orange in the autumn. All of the respective words are acceptable and used for different species of trees. They are clearly distinguishable. I wonder if this is because of perception or actual ecological differences between here and the place you live :).