Hands down my most reliable cut flower, Blackberry Ripple sets buds early and churns out strikingly variegated purple and white blooms on long stems all season long. Note that it sometimes throws up blooms with lavender streaks instead of purple; I have tried marking and separating such plants but they just revert to the dark purple streaks the next year. Very mysterious! Blown centers can be an issue late in the season. Great tuber producer.