See the following guide for more information: http://uoforum.com/threads/guide-legendary-crafting.42557/
Orange Petals, when eaten, provide a means to remove poison from your character without taking further action. Upon the first poison tick, the orange petal will cure a player of the poison they are afflicted with. This effect does not apply to lethal poison.
Each orange petal lasts for 5 minutes.
Where to Obtain:
Orange petals are grown on plants and are gathered from bright orange Bulrushes, Pampas Grass, and Poppies. They are often seen for sale on player owned vendors.