Maltese Cross Lychnis chalcedonica Description Blooms scarlet red flowers on tall stems. Bloom Period: May to AugustGrowth Habit: Upright and clump-formingMature Height: 36" (90cm)Mature Spread: 12" (30cm)Growth Rate: Fast More Details Sun Exposure: Full sun to partial sunCold Hardiness Zone: 3Attracts butterflies and hummingbirdsDrought tolerantDeer and rabbit resistantCut flowerLandscape Use: Borders