Aconitum napellus or Monk's-hood is a tuberous rooted, herbaceous perennial with rounded leaves that are palmately divided in to 5-7 segments.
On a tall central spike appear terminal racemes of deep blue to purple, narrow, helmet-shaped flowers that stand proud and make a lovely splash of contrasting colour in the middle of deep, mixed borders.
Although generally known for its distinctive electric blue colour, other cultivars have emerged that are white and rosy-pink.
They go well in informal garden settings and especially well around water features being native to moist pastures and mountain areas.
They make excellent cut flowers and are also good for drying too.
N.B. wear gloves when working with this plant, avoid skin contact or contact with open wounds. Also avoid planting close to where children play or directly alongside vegetables or herbs.