Veronicastrum virginicum Culver's Physic Description Elegant white flower spires bloom from July to August. The whorled leaves present strong horizontal lines, while the flower spikes provide vertical accents. Native. Characteristics Hardiness Zone: 3-8 Light requirements: Sun/Part Sun Height: 3-6' Native: Yes Sizes & Prices Size: 2 Yr $12.98 Other Information All Culver's Root Culver's Root Veronicastrum vir. 'Lavender Towers' Zone: 3-10 Sun/Part Sun HT: 4-5' Culver's Physic Veronicastrum virginicum Zone: 3-8 Sun/Part Sun HT: 3-6'