Like 'Brookside' but with darker blue flowers, 5cm across. The stuff of myth! Average soil in sun, 70cm. Summer with good repeat and super foliage colour in autumn.
Treasured form has spode blue flowers with large white centres. Doesn’t show its true colour till late summer with cooler, damper weather. Plant it deeper in cool humusy soil in light shade or open position with a good mulch. More or less prostrate.
