So I was doing the forager credo, and I got a quest involving two different plants that are not available in the current season. This sucks, because my only options are to wait for days until I can do it or abandon the quest with no guarantee I won't get another quest that - at this very moment - is not doable.
This kind of reminded me when continents were first added, and you would sometimes get quests to bring something to an NPC that was on another continent, making it almost impossible for most people.
So my suggestion is pretty simple: quests should only ask for items that are seasonally available when the quest starts.