perennial

Broad-petaled Cranesbill

Geranium platypetalum

The Story

Plant Bio

Geranium platypetalum, known as the broad-petaled cranesbill, is a clump-forming herbaceous perennial native to the Caucasus and Western Asia. It forms a dense, mounding ground cover of deeply divided, soft-textured dark green leaves that emerge fresh green in spring.

The large, saucer-shaped flowers feature broad, overlapping purple petals with prominent dark veining, held in loose clusters above the foliage. Flowering begins in late spring and continues into mid-summer, providing nectar for bees and butterflies.

Uses & Benefits:

Forms a dense, soft-textured green carpet topped with large, dark-veined purple flowers in early summer.

Functions as a low-maintenance, weed-suppressing ground cover for sunny or partially shaded borders.

Provides valuable nectar and pollen resources for native bees, butterflies, and generalist pollinators.

Essentials

At a Glance

Plant Type

Perennial

Height

20"

Width

24"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Moderate

Lifespan

Perennial

Native To

Caucasus, Western Asia

Toxicity

Non-toxic

Bloom period

Late spring – Summer

In flower about 4 months of the year

Planting

How to Grow

Select a planting site in full sun to partial shade with average, well-drained soil.
Amend heavy soils with organic matter to ensure excellent drainage, as plants will rot in waterlogged winter conditions.
Space plants 18 to 24 inches apart to allow the mounding ground cover to fill in without crowding.
Water regularly after planting to establish the root system, then reduce watering to a moderate schedule.

Pro Tip

Shear the entire plant back to the ground after the main flowering flush to stimulate a clean, fresh mound of basal foliage and prevent summer tattering.

Keep It Thriving

Care Guide

Do

Cut back the foliage hard after flowering to encourage a fresh flush of healthy leaves.
Apply a balanced, slow-release organic fertilizer in early spring.
Ensure the soil drains rapidly, especially during the winter months.

Don't

Do not over-fertilize, which leads to floppy, excessive foliage at the expense of flowers.
Do not plant in low-lying, boggy areas where water collects.
Do not allow the soil to dry out completely during prolonged heatwaves, as foliage quality will drop.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Fertilize
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

GroundcoverCottage GardenBorder EdgingRock Garden

Companion Plants

Alchemilla mollis Nepeta faassenii Salvia nemorosa

Multiply

Propagation Methods

Good to Know

Common Questions

Broad-petaled Cranesbill questions

What zones can Broad-petaled Cranesbill grow in?

Broad-petaled Cranesbill 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.

When does Broad-petaled Cranesbill bloom?

Broad-petaled Cranesbill typically blooms in late spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Broad-petaled Cranesbill need full sun?

Broad-petaled Cranesbill does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Broad-petaled Cranesbill drought tolerant?

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