perennialN. America Native

Dark Sunflower

The Story

Plant Bio

Helianthus atrorubens, commonly known as the purple-leaved sunflower, is an annual plant distinguished by its vibrant yellow, daisy-like flowers and dark, purplish foliage that adds ornamental value.

This species is especially appreciated for its striking dark foliage contrast and its adaptability to various garden conditions, attracting pollinators with its bright, cheerful blooms.

Uses & Benefits:

Provides vibrant, late summer color and attracts pollinators, enhancing garden biodiversity.

Easy to grow and maintain, tolerates drought, and helps control soil erosion.

Supports bees, butterflies, and other beneficial insects, contributing to a healthy ecosystem.

Essentials

At a Glance

Plant Type

Perennial

Height

48 inches

Width

36 inches

Light

Full Sun

Zones

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds 1 inch deep in well-draining soil in spring
Water regularly until established, about 6 weeks
Choose a sunny location with good airflow
Thin seedlings to 18 inches apart for best growth
Apply a balanced fertilizer monthly during peak season
Stake taller plants to prevent wind damage

Pro Tip

Plant in full sun with well-draining soil for best results.

Keep It Thriving

Care Guide

Do

Water deeply during dry spells 🌱
Deadhead spent flowers to encourage more blooms
Stake tall plants to prevent wind damage

Don't

Avoid overwatering, which can cause root rot ❌
Don’t disturb roots when transplanting
Refrain from fertilizing late in the season

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Spring Cleanup
Stake

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Bright border plantWildlife-friendly garden feature

Companion Plants

Coneflower Black-eyed Susan SedumLavender Coreopsis

Multiply

Propagation Methods

Good to Know

Common Questions

Dark Sunflower questions

What zones can Dark Sunflower grow in?

Dark Sunflower is hardy in USDA Zone 10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Dark Sunflower deer resistant?

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

When does Dark Sunflower bloom?

Dark Sunflower 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 Dark Sunflower need full sun?

Dark Sunflower does best in full sun (6+ hours).

Is Dark Sunflower drought tolerant?

Yes — once established (usually after the first full season), Dark Sunflower handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.