Poison ivy berries are acquired through the Farming skill by picking from a player-grown Poison ivy bush. The item is an ingredient in Weapon poison (++), and can be used with a Compost Bin to make Supercompost. It is possible to use a garden pie to boost your Farming level by 3, in order to plant the poison ivy seed. Further picking the berries will not require a specific farming level. Once all berries are picked from the bush, it will produce more berries, approximately 1 per 20 minutes, until there are 4 again. Farmers require eight poison ivy berries to watch over your growing Calquat tree.