annualN. America Native

Cleavers

The Story

Plant Bio

Galium aparine is a weak-stemmed annual forb that scrambles over surrounding vegetation using backward-hooked bristles along its square stems. The simple, bright green leaves are arranged in whorls of six to eight, and the plant produces tiny, four-petaled white flowers in spring and summer.

This species is notable for its highly adhesive nature, as the microscopic hook-hairs on its stems, leaves, and seed vessels cling readily to animal fur and clothing. The resulting small, dry fruits persist in the soil seed bank, allowing the plant to spread rapidly in disturbed, nutrient-rich soils.

Uses & Benefits:

Provides a bright green, scrambling ground cover in wild or naturalized garden areas.

Historically used for culinary and medicinal teas, though older foliage is unpalatable.

Tiny flowers attract flies and small beetles, while waterfowl consume the foliage.

Essentials

At a Glance

Plant Type

Annual

Height

39"

Width

118"

Light

Full Sun, Partial Sun, Shade

Zones

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

Water

Low to moderate

Humidity

Moderate to high

Lifespan

Annual

Native To

Eurasia

Toxicity

Non-toxic

Bloom period

Spring – Summer

In flower about 6 months of the year

Planting

How to Grow

Select a site with moist, well-drained soil in any light exposure from full sun to deep shade.
Sow seeds shallowly in cool weather, as germination occurs prolifically during autumn or early spring.
Provide adjacent plants or a physical support for the weak stems to scramble over if containment is not a priority.
Monitor the area closely in spring to manually pull plants before they flower and set seed.

Pro Tip

Do not apply nitrogen-rich fertilizers, as excess nutrients stimulate aggressive, sprawling vegetative growth that quickly smothers neighboring plants.

Keep It Thriving

Care Guide

Do

Pull plants manually in early spring before the flowers develop into sticky seed burrs.
Wear gloves when handling the foliage to prevent mechanical skin irritation from the stiff hook-hairs.
Dispose of cleared plants carefully to avoid spreading viable seeds into compost piles.

Don't

Do not fertilize the soil, as high nitrogen levels encourage highly vigorous and invasive scrambling growth.
Do not allow the plant to set fruit if you wish to prevent a persistent weed infestation in subsequent seasons.
Do not attempt to train this annual on permanent ornamental trellises, as it dies back completely in hot summer conditions.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pest Check
Propagate
Prune
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Naturalized Area

Companion Plants

Asarum canadense

Multiply

Propagation Methods

Good to Know

Common Questions

Cleavers questions

What zones can Cleavers grow in?

Cleavers 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 Cleavers bloom?

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

Does Cleavers need full sun?

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