Aconitum volubile aka Monkshood

Aconitum volubile is a climbing perennial known as monkshood. It belongs to the buttercup family, Ranunculaceae. Kew places its native range from Siberia to North Korea. Other accounts include Mongolia and northeastern China. It grows in woods, grassy slopes, and forest edges. Plants For A Future also records it in high mountain thickets. This is a plant of temperate regions, with tuberous roots.

Its twining stems need support as they climb. Garden plants reach 8–12 feet [2.44–3.66 metres] tall. Their spread is about 1.5–3 feet [0.46–0.91 metres]. Small leaves have deep divisions. Clusters of blue-purple flowers form at the stem tips. They bloom from August to September. Each flower has an enlarged upper sepal shaped like a helmet. This hood-like part gives monkshood its common name. The flowers provide late-season colour above nearby plants.

Grow it in rich soil that drains well yet stays moist. It accepts full sun or light shade. Afternoon shade helps in places with hot summers. Missouri Botanical Garden notes that summer heat can cause poor growth. Do not let the soil dry out. At the same time, avoid waterlogged ground. The plant suits USDA hardiness zones 4–8. Sow fresh, ripe seed in a cold frame. Spring sowing after cold treatment can lead to slow germination. Plants can also be raised by division.

Use a trellis, wire fence, shrub, or small tree as support. Moist woodland gardens suit its needs. It can grow beside streams or ponds without standing in waterlogged soil. Borders also work where the soil stays moist. Deer and rabbits tend to leave it alone. Serious pest and disease problems are uncommon. Crown rot, powdery mildew, and verticillium wilt can still occur. It may also hinder nearby plants, including legumes.

Every part is highly poisonous, with roots and seeds posing particular danger. Skin contact can cause numbness in some people. Wear gloves and keep sap away from skin and mouth. Cover cuts before handling the plant. Avoid sites where young children could reach it. Keep its tubers away from vegetable beds. Plants For A Future records a food use for prepared young leaves. It also warns that this report is unreliable because of toxicity. Do not treat the leaves as food. Reported medicinal uses include the dried root as an anaesthetic. Such uses require qualified supervision and do not make home use safe.