Species

Dahlia pinnataPinnate Dahlia

34 other cultivars

perennial

Who Dun It Dahlia

Dahlia pinnata 'Who Dun It'

The Story

Plant Bio

Dahlia hybrids are tuberous perennials prized for their incredibly diverse flower forms, sizes, and colors, blooming from mid-summer to the first frost. They have pinnately compound leaves on succulent stems.

'Who Dun It' is a large informal decorative dahlia, featuring impressive 8-10 inch blooms with creamy white to pale yellow petals that are tipped and edged in a contrasting lavender-purple.

Uses & Benefits:

Dahlias provide vibrant, showy blooms perfect for bouquets and garden displays, adding color and texture.

They attract pollinators like bees and butterflies, supporting garden ecology.

Dahlias help sustain beneficial insects and contribute to biodiversity.

SpeciesDahlia pinnataPinnate Dahlia

Essentials

At a Glance

Plant Type

Perennial

Height

36 inches

Width

24 inches

Light

Full Sun

Zones

8, 9, 10

Water

Moderate

Humidity

Moderate

Lifespan

Perennial in suitable zones, otherwise annual

Native To

Mexico

Toxicity

Toxic to pets

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Planting

How to Grow

Choose a sunny, well-drained location for planting 🌞.
Tuck tubers 4-6 inches deep in rich, loamy soil 🌱.
Water regularly to keep soil moist but not waterlogged 💧.
Pinch back early growth to encourage bushier plants ✂️.
Apply a balanced fertilizer monthly during the growing season 🌼.
Lift and store tubers after first frost for overwintering ❄️.

Pro Tip

Use organic compost to boost soil fertility and plant health.

Keep It Thriving

Care Guide

Do

Water deeply once a week during dry spells 💧.
Deadhead spent blooms to promote continuous flowering ✂️.
Provide support for tall varieties to prevent flopping 🎋
Apply mulch to retain moisture and suppress weeds 🌱
Fertilize monthly during active growth period 🌼

Don't

Avoid overwatering to prevent tuber rot ❌
Don’t plant in shady areas; they need full sun ☀️
Refrain from disturbing tubers during flowering season ❌
Don’t forget to lift tubers before frost ❌
Avoid using heavy clay soil without amendments ❌

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vivid flower borderColorful garden bedTall focal point in mixed borders

Companion Plants

Marigolds Salvia Zinnia Cosmos Nicotiana

Multiply

Propagation Methods

Good to Know

Common Questions

Who Dun It Dahlia questions

What zones can Who Dun It Dahlia grow in?

Who Dun It 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 Who Dun It Dahlia deer resistant?

Not reliably. Deer may browse Who Dun It Dahlia, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Who Dun It Dahlia bloom?

Who Dun It Dahlia typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Who Dun It Dahlia need full sun?

Who Dun It Dahlia does best in full sun (6+ hours).