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Delphinium grandiflorum
Siberian larkspur
Delphinium grandiflorum
Delphinium grandiflorum, commonly known as Chinese Delphinium, is a herbaceous perennial prized for its vibrant blue, purple, or white flower spikes. These elegant plants are a favorite in cottage gardens and borders, adding vertical interest and color throughout the summer. They prefer cool climates and well-drained soil.
CategoryDetails
Plant TypePerennial plant
Estimated Plant Lifespan3 years lifespan
Toxic to humansToxic to humans
ToxicityToxic to: Cats, Dogs
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: Animal

Notes: Delphiniums are pollinated primarily by bees, particularly bumblebees. Hand pollination is possible for increased yield in some cases.

Watering Requirements

Method: Water at the base of the plant

Frequency: Water deeply and regularly, especially during dry spells, but avoid overwatering.

Notes: Ensure good drainage to prevent root rot.

Humidity Requirements

Level: Moderate

Maintenance: Provide good air circulation to prevent fungal diseases, especially in humid conditions.

Care InstructionsDeadhead spent flower spikes to encourage continued blooming. Provide support for tall varieties to prevent them from flopping over. Protect plants from strong winds.
Temperature Range

Min: 10°C

Max: 30°C

Alternative NamesChinese delphinium

Cultivars

Papaver rhoeas
common poppy
Papaver rhoeas
Poppies bloom at the same time as Delphiniums, offering a contrasting color and texture, and they have similar growing needs.
Rudbeckia hirta
black-eyed Susan
Rudbeckia hirta

Black-Eyed Susans can be aggressive spreaders and may outcompete Delphiniums for nutrients and sunlight.

Helianthus annuus
Common Sunflower
Helianthus annuus

Sunflowers can grow very tall and shade out Delphiniums, competing for sunlight and resources.

Slugs and Snails

These pests feed on the leaves and young stems of Delphiniums, leaving behind ragged holes and slime trails. This can weaken the plant and reduce flowering.

Aphids

Aphids suck sap from the stems, leaves, and flower buds. Infested plants may have stunted growth, distorted leaves, and a sticky substance called honeydew. This can also lead to sooty mold growth.

Spider Mites

These tiny pests suck sap from the leaves, causing stippling, yellowing, and webbing. Severe infestations can lead to plant decline.

Steps:

    • Seed: Sow seeds indoors 6-8 weeks before the last expected frost. Surface sow the seeds and barely cover them with soil.
    • Seed: Transplant seedlings outdoors after the danger of frost has passed, spacing them about 1-2 feet apart.
    • Division: Divide mature plants in early spring or fall, every 3-4 years, to rejuvenate them and propagate them. Ensure each division has healthy roots and shoots.

Neem Oil

Effective natural pesticide to control aphids and spider mites. It also helps prevent fungal diseases.

Slug and Snail Bait

Used to protect the plants from slug and snail damage.

Compost

Enriches the soil, providing essential nutrients and improving drainage.