7 named cultivars

perennial

Balloon Flower

The Story

Plant Bio

Platycodon grandiflorus, the balloon flower, is a clump-forming herbaceous perennial from China, Korea, Japan and eastern Russia. It makes a tidy mound 12 to 24 in tall and 12 to 18 in across, with toothed blue-green leaves on upright stems. Fat inflated buds open into broad five-pointed bells of violet-blue, white or pink through summer.

The buds swell like small paper balloons before splitting open along the seams, which is where the name comes from. It breaks dormancy very late in spring, so mark the crown to avoid digging it out by mistake. The thick fleshy taproot resents disturbance and the plant is best left undivided once settled.

Uses & Benefits:

Inflated buds and broad star-faced bells in violet-blue, white or pink over neat blue-green foliage, with a long midsummer season.

A tidy, self-supporting perennial that needs no division or staking and suits containers as readily as borders.

The wide open bells are easily worked by bumblebees and other long-tongued bees through the height of summer.

Essentials

At a Glance

Plant Type

Perennial

Height

18 inches

Width

15 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate; must drain freely in winter

Humidity

Average

Lifespan

10 to 20 years undisturbed

Native To

China, Korea, Japan and eastern Russia

Toxicity

Non-toxic; the root is eaten as a vegetable in Korea

Planting

How to Grow

Plant in full sun or light afternoon shade in well-drained loam.
Set the crown level with the soil surface, never deeper.
Mark the position with a label; growth appears very late.
Water through dry spells but keep winter soil free-draining.
Deadhead each spent bell to keep new buds coming.
Cut stems to the ground after the first hard frost.

Pro Tip

Leave it where it is: the brittle taproot rarely survives a move, so plants are far better raised from seed than divided.

Keep It Thriving

Care Guide

Do

Give it free-draining soil that stays dry in winter 🌱
Mark the crown in autumn so you do not hoe it out 🏷️
Deadhead individual flowers as they fade ✂️
Support taller forms with a discreet ring early in the season 🪴

Don't

Do not dig or divide it once established ❌
Do not plant it in heavy soil that sits wet over winter ❌
Do not give up on it in April; it is simply late to appear ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead And Cut Back
Watch For Late Emergence

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Front to mid border perennial in a sunny bedContainer and patio planting where the buds can be seen close upCottage and gravel garden filler among low grasses

Companion Plants

Catmint CoreopsisShasta daisy Autumn stonecrop Russian sage

Multiply

Propagation Methods

Good to Know

Common Questions

Balloon Flower questions

What zones can Balloon Flower grow in?

Balloon Flower is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Balloon Flower deer resistant?

Yes — Balloon Flower is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Balloon Flower bloom?

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

Does Balloon Flower need full sun?

Balloon Flower does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.