Soft wood is the stem under a recently shattered bloom. Hard wood can be the stem beneath that piece which has recently flowered, or it can be that recently flowered stem, next season. Usually, soft wood can easily wilt if not kept covered while hard wood is "harder" and may not require being covered. Does that help?

Thanks. Can hardwood be green?

Absolutely, yes. That depends upon the rose. Some will be more brown and woody looking while others will simply be (usually) a little darker green than the softer wood.