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Aromatic, feathery foliage makes a dense evergreen mat in the herb garden that will cheerfully creep around. Chamaemelum nobile, sometimes known as Roman Chamomile, is a helpful medicinal herb. This sturdy perennial produces a profusion of white daisy blooms throughout the summer, which may be dried for potpourri or used to make your own chamomile tea. Height: 30cm (12). Spread: 45 cm (18).