Achillea ‘Coronation Gold’ is a low maintenance and easy to grow variety, which makes it understandably popular. It really is one of the best herbaceous perennials for a mixed border, with eye-catching flat flower heads of golden-yellow, it has a long flowering period over the summer. Achillea loves a hot, sunny border and will reward your summer garden with colour for minimum effort. Quick to establish, they are ideal for filling a gap in the border. Height: 1m (39). Spread: 50cm (20).