SISYRINCHIUM E.K.Balls Purple flowers produced all summer. £2.40 out of stock 0 in your basket View Basket Checkout Long flowering period Clump forming Height 15cm Spread 25cm Sword shaped grass like foliage. An abundance of purple flowers from May-September. Thrives in any reasonable moisture retentative soil. We advise cutting back to soil level during early spring as growth begins at this keeps the plant tidy.