Photo of a violet Physostegia

Leaf arrangement: crosswise opposite. Flower type: Single. Leaf margin: Dentate. Flower scent: Unscented. Winter hardness: Excellent (USDA-zone 1,2,3,4). Flower color: Purple-medium violet-N081A. Soil fertility: No poor soils. Leaf, general shape: Lanceolate. Flower diameter: 1 -...