A non-edible spreading herbaceous perennial with grey-green, finely divided, ferny foliage and heads of yellow, button-like flowers in summer and autumn. It grows to a height of 1m. It spreads out by means of creeping roots and can become quite large over time. Frost hardy. It has a pleasant aroma for the garden. The flowers attract beneficial insects such as ladybirds, hoverflies and lacewings.