Species

1 other cultivar

‘Dark Blue Dark Bee’Belladonna Delphinium

perennial

Pacific Giant Delphinium

Delphinium x belladonna 'Pacific Giant'

The Story

Plant Bio

Tall and stately perennial with lush foliage and spikes of vibrant flowers.

Known for its impressive height and large flower spikes, particularly suitable for cutting gardens.

Uses & Benefits:

Delphinium x belladonna Pacific Giant provides tall, vibrant spikes of color that add elegance and vertical interest to gardens.

Its striking appearance can be used as a focal point or backdrop in flower beds.

Attracts pollinators like bees and butterflies, supporting local ecosystems.

Essentials

At a Glance

Plant Type

Perennial

Height

60 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7

Water

Moderate

Humidity

Average

Lifespan

Short-lived perennial

Native To

Cultivated hybrid

Toxicity

All parts are toxic if ingested

Bloom period

Early summer – Late summer

In flower about 3 months of the year

Planting

How to Grow

Tuck seeds into moist soil in early spring for best germination.
Mist cuttings regularly to keep humidity high during propagation.
Transplant seedlings after they develop 2-3 sets of true leaves, typically in spring.
Water deeply once a week during dry periods to promote healthy roots.
Fertilize with a balanced 10-10-10 formula every 4-6 weeks during growing season.
Stake tall flower stems to prevent wind damage and support blooms.

Pro Tip

Plant in well-drained soil with rich organic matter and provide partial shade for vigorous growth.

Keep It Thriving

Care Guide

Do

Water consistently to keep soil moist but not waterlogged 🌱
Apply mulch to retain soil moisture and regulate temperature
Deadhead spent flowers to encourage more blooms
Provide support for tall flower spikes

Don't

Avoid overwatering to prevent root rot ❌
Do not fertilize with high nitrogen in late season
Never disturb roots during transplanting
Avoid full sun exposure in very hot climates

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Pest Check
Prune
Stake

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Tall, dramatic flower bordersColorful perennial bedsFocal points in cottage gardens

Companion Plants

Foxglove Lupine Columbine Salvia Echinacea

Multiply

Propagation Methods

Good to Know

Common Questions

Pacific Giant Delphinium questions

What zones can Pacific Giant Delphinium grow in?

Pacific Giant Delphinium is hardy in USDA Zones 4–7. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Pacific Giant Delphinium deer resistant?

Not reliably. Deer may browse Pacific Giant Delphinium, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Pacific Giant Delphinium bloom?

Pacific Giant Delphinium typically blooms in early summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Pacific Giant Delphinium need full sun?

Pacific Giant Delphinium does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.