Delphinium, also known as larkspur, can be annuals, biennials, or perennials with tall and showy spikes of flowers. They are native to native to the Northern Hemisphere and belong to the family Ranunculaceae. 

Hardiness: Most delphinium plants are hardy plants and can survive in USDA zones 3 to 7. Some varieties are more heat tolerant and can thrive in zones 5-9.

Habit: Delphiniums grow tall and upright, with a height ranging from 2 to 6 feet (60-180 cm), depending on the variety. They have a clump-forming growth habit and can spread up to 2 feet.

Flowers: Their flowers come in a wide range of colors, including blue, purple, pink, white, and yellow, and are often marked with a contrasting eye or dark center.

Blooming season: They bloom in the summer months, typically from June to September.

Uses: Delphinium is a popular garden plant and is often used in cottage gardens or as border plants.

Pollinators: Delphinium flowers are attractive to pollinators such as bees, butterflies, and hummingbirds, making them a great addition to a pollinator garden.

Symbolism: Delphiniums symbolize dignity and grace and are often used in floral arrangements for weddings and other formal events.

Cultivars: There are many cultivars of delphiniums available, including the Pacific Giant series, the Magic Fountain series, and the Belladonna series. These come in a range of colors, including blue, purple, pink, and white.

Deer/rabbit: Delphinium is a deer and rabbit-resistant plant. These animals are not attracted to their foliage or flowers, making them a great choice for gardens that are prone to wildlife damage.

Poisonous: All parts of the delphinium plant, especially the seeds, are poisonous if ingested. Gardeners should take care when handling the plant and keep it away from children and pets.

Overall, delphiniums are a beautiful and elegant addition to any garden, and with proper care, they can provide years of stunning blooms.