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Wormwood is a fairly large green plant and alchemy reagent. It can be found growing in all zones, with the exception of Coldharbour (outside of the Hollow City). Like the other non-mushroom plants, it tends to grow out in the open. The plants have a higher than average chance of producing worms in addition to the reagent.
This chart lists only combinations in which two or more of Water Hyacinth's effects are present.