Genus Buddleia Species x Cultivar 'Purple Haze' Lo & BeholdÂ® Common Name Lo & BeholdÂ® 'Purple Haze' Butterfly Bush Patent ID 24514 Height 2 to 3 Feet Spread 3 to 4 Feet Habit Low mounding, spreading habit. Moderate growth rate. Zone 5 to 9 Culture Full sun. Flower Dark purple flowers. Blooms mid-summer to frost. Flower Color Dark purple Foliage Medium green foliage. Deciduous. Categories: Deciduous Shrub Proven Winners® Color Choice Description Photo courtesy of Proven Winners.