The unusually tall, narrow shape of the "hood" on each flower earned this monkshood a place in Finnish mythology as the source of the distinctive cap worn by of one of their gods. In fact, it's native throughout Scandinavia and into Northern Asia. It's happiest in the dappled shade and damp soil of its native woodlands, but it's also fine in full sun as long as the soil stays moist. Deadheading will encourage repeat bloom.

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.