perennial

Siebold's Campion

The Story

Plant Bio

Lychnis sieboldii is a perennial herbaceous plant known for its upright clumps of finely textured, lance-shaped green foliage and clusters of small, star-shaped pink flowers that bloom in summer.

This species is appreciated for its delicate flowers and ability to attract pollinators, making it a good choice for moist, partially shaded borders and woodland gardens.

Uses & Benefits:

Provides vibrant pink flowers mid-summer, attracting visual interest.

Prefers moist soil, good for shaded borders and rain gardens.

Supports pollinators with nectar-rich flowers in summer.

Essentials

At a Glance

Plant Type

Perennial

Height

24 inches

Width

12 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Requires regular moisture

Humidity

Prefers moderate humidity

Lifespan

Perennial

Native To

Japan

Toxicity

Some species may be mildly toxic if ingested

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds lightly into moist soil in early spring.
Water regularly to keep soil evenly moist.
Transplant seedlings when established after 6 weeks.
Divide clumps every 3 years in early spring.
Mulch to retain moisture and suppress weeds.
Prune after flowering to maintain shape.

Pro Tip

Ensure consistent moisture for best flowering performance.

Keep It Thriving

Care Guide

Do

Water regularly during dry spells 🌱
Deadhead spent flowers to encourage more blooms
Apply a balanced fertilizer in spring

Don't

Avoid letting soil dry out completely ❌
Don’t cut back in late fall to prevent winter damage
Refrain from over-fertilizing to avoid floppy growth

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Pink-flowered borderMoist shaded garden bed

Companion Plants

HostaFerns AstilbeJapanese painted fern Ligularia

Multiply

Propagation Methods

Good to Know

Common Questions

Siebold's Campion questions

What zones can Siebold's Campion grow in?

Siebold's Campion 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 Siebold's Campion deer resistant?

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

When does Siebold's Campion bloom?

Siebold's Campion 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 Siebold's Campion need full sun?

Siebold's Campion does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.