This grower is sure of this plant identification.
Gorgeous - Like a totally slug-proof autumn-flowering delphinium - tall spikes of deep blue flowers in September-October. Beautiful fresh green foliage from March until late autumn - looks great in March when most perennials have barely begun to grow. DO NOT EAT, and avoid rubbing against the skin.
Azure monkshood 'Arendsii', Monkshood, Wolfsbane
Aconitum carmichaelii (Arendsii Group) ‘Arendsii’ (Azure monkshood 'Arendsii'). This is an erect perennial with 3-5-lobed, leathery, dark green leaves and which bears dense panicles of large, violet-blue flowers in early autumn.
Synonymous with A. fischeri.
Upright stems may need staking, particularly in a shady site.
Border, cutting bed, mixed bed
Italics = data drawn from parent genus or speciesView Full Plant Finder Record