Yarrow Achillea 'Walther Funcke' - Organic orange - Hardy plantSmall, orange organic flowers with a yellow centre. The Sweet William 'Walther Funcke' (Achillea millefolium) brightens up the garden! Thanks to the butterflies and bees the plant attracts. The cheerful flowers also work well as border plants! The flowers bloom in the summer. Put the plant somewhere in the sun. The Sweet William grows best in well drained soil. Give it extra water during dry periods. The perennial is organically certified! This means