Hypericum olympicum f. uniflorum ‘Citrinum’

A low Mediterranean sub-shrub with tiny blue-grey-green leaves and a mass of large primrose-yellow flowers with very long stamens over a long summer period. The flower colour of this plant is consistently described as lemon-yellow by other nurseries, but I can only assume they haven't bothered looking at one. For a sunny well drained bed, best trimmed a little in spring before new growth. Hardy.