Ultramarine-blue larkspur flowers with lacy leaves on a compact, well-branched plant. Grows just 14 in. Deep blue flowers begin in early summer and continue throughout the season. Blue Butterfly Delphinium is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. Plant in a fertile, well-drained soil in full sun. This rare dwarf delphinium grows just 12-14'' tall -- ideal as a colorful low hedge or the front of a border. Year Introduced: Size #1 Container. Better heat tolerance than most delphiniums. Hard to find, the plants grow only 12-14" tall, making it ideal for the front of the border. Delphinium, Blue Butterfly $ 14.98. One of our favorite new perennials, the deep blue flowers of Blue Butterfly Delphinium begins in summer a reappear all season. ... Additional information Description. Grow in fertile soil. Electric blue flowers and no staking! Cottage/Informal, Flower Arranging, Beds and borders. Additional information. Cultivation. Delphinium grandiflorum 'Blue Butterfly' (Delphinium 'Blue Butterfly') will reach a height of 0.5m and a spread of 0.3m after 2-5 years. Suggested uses. Dozens of deep blue flowers bloom from early to mid-summer. Blue Butterfly Delphinium Delphinium grandiflora 'Blue Butterfly' One of our favorite perennials. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a mass of flowers against which the thriller plants stand out. Needs not staking and is deer resistant. Visit us to learn more about our Blue Butterfly Delphinium.