At one time tea was unknown on the island .
When a cargo of the stuff floated ashore from a wreck it was used by one woman to dye her flannel petticoats ( normally dyed with woad ) .
At one time tea was unknown on the island , and when a cargo of the stuff floated ashore from a wreck it was used by one woman to dye her flannel petticoats ( normally dyed with woad ) .