perennial

Double White Tree Dahlia

Dahlia imperialis 'Double White'

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Essentials

At a Glance

Plant Type

Perennial

Height

144 inches

Width

48 inches

Light

Full Sun, Partial Sun

Zones

8, 9

Water

Moderate

Humidity

Moderate

Lifespan

Perennial in suitable zones

Native To

Mexico, Central America, and Colombia

Toxicity

Toxic to pets

The Story

Plant Bio

Dahlia imperialis, commonly known as the Tree Dahlia, is a statuesque perennial characterized by its tall, bamboo-like stems and large, lush foliage. The 'Double White' cultivar features elegant, fully double white flowers that bloom in late autumn, standing out in the garden when other plants are fading.

Bloom Period:

EarlyLate

Uses & Benefits:

Dahlias are prized for their vibrant, large flowers that add striking color and height to gardens, creating a focal point and enhancing visual appeal.

Their cut flowers last long in arrangements, making them excellent for floral displays and bouquets.

Dahlias attract pollinators such as bees and butterflies, supporting local biodiversity.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck seeds or tubers into well-draining soil in early spring.
Water consistently to keep soil moist but not soggy.
Provide full sun for optimal flowering and growth.
Fertilize monthly with a balanced fertilizer during the growing season.
Stake tall varieties to prevent wind damage.
Mulch around plants to retain moisture and suppress weeds.

Pro Tip

Plant dahlias in a sunny, sheltered spot for best blooms and minimal wind damage.

Keep It Thriving

Care Guide

Do

Water deeply once a week during dry spells 🌱
Deadhead spent flowers to encourage more blooms
Apply a balanced fertilizer monthly during the growing season
Stake tall plants to prevent breakage
Mulch to conserve moisture and regulate soil temperature

Don't

Avoid overwatering to prevent tuber rot ❌
Do not disturb tubers during flowering season
Avoid using high nitrogen fertilizers that encourage foliage over flowers
Don’t plant in poorly-drained soil
Refrain from cutting back in late fall if you want to overwinter tubers outdoors

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Lift Store
Plant
Stake

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Tall, showy flower borderColorful garden centerpieceCut flower for arrangements

Companion Plants

Marigolds Zinnias Salvia Cosmos Sunflowers

Multiply

Propagation Methods

Good to Know

Common Questions

Double White Tree Dahlia questions

What zones can Double White Tree Dahlia grow in?

Double White Tree Dahlia is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Double White Tree Dahlia deer resistant?

Not reliably. Deer may browse Double White Tree Dahlia, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Double White Tree Dahlia bloom?

Double White Tree Dahlia typically blooms in late fall through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Double White Tree Dahlia need full sun?

Double White Tree Dahlia does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.