Aconitum orientale

Aconitum orientale is a perennial in the buttercup family, Ranunculaceae. Its native range runs from Türkiye to the Caucasus. Records include Azerbaijan and the Russian region of Ciscaucasia. It grows in a temperate climate. Garden names include Caucasian monkshood and downy wolfbane. The latter name refers to fine hairs on its leaves.

This upright plant reaches about 5 feet (1.5 metres) tall. Its spread is about 1 foot (0.3 metres). Chicago Botanic Garden describes flower spikes 2 feet (0.6 metres) long. The blooms may be light yellow or medium blue. Sources give different flowering seasons. Plants For A Future lists July through August. Chicago Botanic Garden records September through October. Each flower has both male and female organs. Bees pollinate the flowers, and the plant also attracts butterflies.

Give this plant moist soil in sun or partial shade. It suits woodland gardens with light, broken shade. It grows in sandy soil, loam, and heavy clay. Plants For A Future notes a preference for lime-rich ground. Yet both garden sources support a broad soil pH range. Mildly acid, neutral, and mildly alkaline soils can all suit it. Chicago Botanic Garden lists USDA zones 3–7. Its tall, upright form suits borders and beds. It can also stand alone as a specimen plant.

Plants For A Future reports that it can hinder nearby plants. Legumes may be more affected than other neighbours. Chicago Botanic Garden lists resistance to deer. Plants For A Future does not flag it as weedy. Seed and division both offer ways to raise new plants. Sow ripe seed in a cold frame. Stored seed may need cold treatment and can germinate slowly. Keep young plants in a cold frame through their first winter. Sources differ on the best season for division. They name spring, autumn, or late winter.

The whole plant is highly poisonous and has no known food use. Skin contact has caused numbness in some people. Its dried root has a history of medicinal use. Reported uses include pain relief and promoting sweat and urine. These records do not make it safe for home treatment. Plants For A Future warns that medicinal use needs qualified supervision. Its value in the garden must be weighed against this serious hazard.