Looking to add some zing to your plot? Mustard is a triple threat: Grow it for its zippy leaves, vibrant flowers, or pungent seeds. From fiery condiments to mellow greens—this cool-weather crop ...

This doesn't look edible, let alone medicinal: thin, pointed leaves with a flavour like rocket fuel, and a crop of straggly yellow flowers. Yet an extract made from the Indian Mustard plant is ...