annual

Garden Petunia

Petunia atkinsiana

The Story

Plant Bio

Petunia × atkinsiana is a mounding or trailing herbaceous tender perennial, widely cultivated as a warm-season annual. The simple, ovate leaves are covered in sticky glandular hairs that emit a distinct, heavy scent when handled.

This hybrid species originates from crosses between wild South American species, producing funnel-shaped flowers in an extensive range of solid colors, stripes, and bicolors. The blooms appear continuously from spring until the first hard frost of fall.

Uses & Benefits:

Produces a continuous, prolific display of colorful funnel-shaped flowers from spring to fall.

Serves as an excellent, fast-growing choice for hanging baskets, window boxes, and mixed containers.

Provides nectar for hummingbirds, clearwing moths, and long-tongued bees.

Essentials

At a Glance

Plant Type

Annual

Height

24"

Width

36"

Light

Full Sun

Zones

4, 5, 6, 7, 8, 9, 10

Water

Moderate

Humidity

Moderate

Lifespan

Annual

Native To

South America

Toxicity

Toxic if ingested

Bloom period

Spring – Fall

In flower about 9 months of the year

Planting

How to Grow

Select a planting site that receives at least six hours of direct daily sunlight.
Amend the soil with organic matter to ensure high drainage and a slightly acidic to neutral pH.
Pinch back leggy stems at planting to stimulate dense basal branching.
Water deeply when the top inch of soil dries, avoiding overhead watering to protect the blooms.

Pro Tip

Avoid high-nitrogen fertilizers which stimulate lush foliage at the expense of flowers, and maintain a soil pH below 6.5 to prevent iron chlorosis.

Keep It Thriving

Care Guide

Do

Deadhead spent blooms regularly to encourage continuous flower production.
Shear the entire plant back by one-third in mid-summer to rejuvenate growth for a fall flush.
Clear away spent, sticky flower bases to prevent gray mold infections.

Don't

Do not overwater or plant in heavy, poorly draining soils, which leads to root and stem rot.
Do not apply heavy nitrogen fertilizers that cause excessive vine growth without blooms.
Do not handle the foliage extensively if you have sensitive skin, as the sticky hairs can cause mild dermatitis.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Fertilize
Pest Check
Pinch
Plant

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

BordersContainersHanging basketsMass plantingsWindow boxes

Companion Plants

Calibrachoa Phlox

Multiply

Propagation Methods

Good to Know

Common Questions

Garden Petunia questions

What zones can Garden Petunia grow in?

Garden Petunia is hardy in USDA Zones 4–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

When does Garden Petunia bloom?

Garden Petunia typically blooms in spring through fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Garden Petunia need full sun?

Garden Petunia does best in full sun (6+ hours).

Is Garden Petunia drought tolerant?

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