— Plant your Aconitum (or Monkshood) bare roots outside during spring or autumn.

— Select an area with moderately fertile, humus-rich soil, that is in full sun or part shade.

— Set plants 50-70cm apart or individually in large containers.

— Select an area with moderately fertile, humus-rich soil, that is in full sun or part shade; avoid any soil that becomes waterlogged.

— If growing Monkshood in a pot, use well-drained soil mix of equal parts loam, leaf mould (or soil-less compost).

— Water-in after planting and, while in growth, do not let the soil become dry.

— For best foliage and flowers, apply a balanced fertiliser in April and again in July.

— Deadhead as necessary, to prolong the flowering season.

— After several years, lift and divide congested clumps in autumn or spring.

— Read further general instructions about planting bare-root perennials