No, that's wrong. It's perfectly normal to use 青 for vegetation, e.g. 青葉. And it...

lmm 70 days ago | parent | context | favorite | on: Colour in the Middle Ages

No, that's wrong. It's perfectly normal to use 青 for vegetation, e.g. 青葉. And it's perfectly normal to use 緑色 for everyday non-vegetation things (e.g. on a quick search I found clothes, cars, wallets...)