First of all: cotton. Basically a plant variant of wool, both can be spun into yarn, thus making it easier for new players who don’t have a large amount of land for animal farming to have light armor. Seeds can drop from sheep
Featherweed: a plant which produces a feather because feathers are far more rare in the game than their utility demands. Seeds drop from chickens
Oak tree: It would be chopped down for oak which can be burned into charcoal rather than turned into fuel. Acorns would drop from raccoons.
Grass seeds: drops from rats. Can turn patches of snow or sand into grass, but has a chance of reverting depending on latitude.
Farming seems to be a weak point to the game. Especially when farming can help new players with small homes where ranching demands larger homes, which are not so sustainable with the repair nerf, unless you are a high level player.