Might be getting mixed up with salmon berry or nettles but if I remember right you can chew them up and put a wad of needles and saliva on a wound for antiseptic properties / covering
Cauterize with a certain powdered (then highly flammable lichen) & spark like black powder
Stinging nettles can even be inwardly wrapped (close the bottoms and spines inside it's own leaf) was up enough layers can be eaten (chew a lot I would think kek)
Pine sap to plug holes in boats / wood canoes
Plus it smells awesome