The evil Belladonna (also known as Belladonna the Witch) actually only ever appeared in one episode of The Herbs.

She wished to take over the Herb garden, and have all the innocent Herbs in her power. However, she was considered by the BBC to be too frightening for children, and so her first appearance would also be her last; she managed to revert Parsley, Sir Basil and Lady Rosemary to their natural herb states, but she was driven away by Dill due to the old tradition of 'dill' being planted to keep witches away.

She did however leave behind her broomstick, which was occasionally used as a plot device by Parsley, such as helping him create a carriage for Good King Henry, and to burn out Taragon's fire.