Summer Nights Delphinium - (Delphinium grandiflorum 'Summer Nights') Perennial Plants Other Common Names: Summer Nights Delphinium, Dwarf Delphinium, Larkspur, Dwarf Larkspur Family: Ranunculaceae Genus: Delphinium Species: grandiflorum Cultivar: 'Summer Nights' NewGardenPlants.com's selection includes perennials, annuals, petunias, coneflowers, and other flowers and plants. Delphinium Summer Nights, Delphinium grandiflorum 'Summer Nights', is a lovely dwarf variety that makes a great perennial garden plant, cutting garden or a great for an edging or container plant. Summer Nights Delphinium is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. Butterflies and hummingbirds love the masses of deep violet blue flowers in late spring through early summer. Delphinium 'Summer Nights', Dwarf delphinium 'Summer Nights' Genus. Variety or Cultivar 'Summer Nights' _ 'Summer Nights' is a compact, bushy, short-lived perennial with deeply lobed, dark green leaves and panicles of single, spurred, dark blue flowers in summer. New Garden Plants is your convenient online garden plants center. It is often used as a 'filler' in the 'spiller-thriller-filler' container … Delphinium Delphinium. Delphinium grandiflorum 'Summer Nights' (Summer … Delphinium Summer Nights found in: Delphinium grandiflorum 'Summer Nights', Attractive dwarf plants covered in a blanket of dainty midnight-blue..