This native of the Caucasian mountains waits until fall to send up its spires of blue-violet flowers with their white hearts. It's bushier than most monkshoods, and the flowers often branch out more from the central stem than is typical. While it can handle full sun if you keep the soil moist, it's happiest in dappled shade.

Aconitums are commonly known as monkshood, because the upper
sepal of each flower resembles the hoods of medieval monks. They
attract a variety of butterflies and moths, and are the primary food
source for Old World bees. Another common name, wolfbane, refers to the
poison made
from this plant's roots, which was used to tip hunting arrows.
Medicinal (and poisonous) uses of this plant date back to ancient times.
What's the difference between a medicine and a poison? Dosage.