Ok…so the thing is, fiddleheads are only harvestable in the spring and thus, they behave like all other seasonal plants and prompt you to harvest them. I think the solution here is to make it easy to distinguish fiddleheads from underbrush at a glance so you don’t have to spend the time either searching for actual underbrush or accepting/skipping prompts while foraging. Have you tried out “auto-forage” it’s one of the auto-features and can each one can be bound to a hotkey. I like to bind toggle auto-features and just leave all the features on, then you can toggle the whole lot according to the situation.
Raw cattails aren’t poisonous and can be eaten raw with no ill effects. They appear to be some kind of super survival food. Maybe they taste bad?
Raw fiddleheads, otoh:
Eating raw or improperly cooked fiddleheads can cause symptoms of foodborne illness. The cause is likely an unidentified natural toxin in fiddleheads . Symptoms usually begin 30 minutes to 12 hours after ingestion and may include nausea, vomiting, diarrhea, abdominal cramps, and headaches.
I think the morale hit is justified and tbh they could warrant a mild poison flag if such a thing existed.