groundcover

Biddy-Biddy

Acaena novae-zelandiae

The Story

Plant Bio

Acaena novae-zelandiae is a creeping perennial subshrub that forms dense, low mats of finely pinnate foliage emerging in shades of green to bronze-green. Tiny petal-less flowers pack into small spherical heads atop short stems in late spring, followed by mature fruiting heads bearing sharp, barbed spines.

This species spreads via rooting stolons to cover sandy or rocky ground, functioning as a tough low groundcover. The hooked burrs cling to passing clothing and animal fur, making it prone to unintended spreading if planted near high-traffic paths.

Uses & Benefits:

Forms a dense carpet of feathery, bronze-tinted foliage ideal for rockeries.

Binds loose sandy soils and tolerates harsh coastal wind and salt spray.

Provides ground cover and flowers visited by small native insect pollinators.

Essentials

At a Glance

Plant Type

Groundcover

Height

Width

36"

Light

Full Sun, Partial Sun

Zones

6, 7, 8, 9

Water

Low

Humidity

Tolerates dry to moderate humidity

Lifespan

Perennial

Native To

New Zealand, Australia, Pacific islands

Toxicity

Non-toxic, but seed heads produce sharp, barbed burrs

Bloom period

Late spring – Late summer

In flower about 4 months of the year

Planting

How to Grow

Select a site in full sun to partial shade with lean, well-drained soil.
Space starter plugs or divisions 12 to 18 inches apart to accommodate spreading stolons.
Water lightly after planting until roots establish into the surrounding soil.
Avoid applying high-nitrogen fertilizer, which produces loose, leggy growth prone to stem decay.

Pro Tip

Trim trailing stolon edges with shears in early spring to prevent the mat from encroaching on adjacent plantings.

Keep It Thriving

Care Guide

Do

Plant in sharp-draining sand or gravelly loam to keep root systems healthy.
Prune back spreading runner edges annually to maintain clear garden borders.
Expose to full sun for the densest foliage growth and strongest stem structure.

Don't

Do not plant near dog runs, livestock pastures, or main walkways where burrs will catch on fur or clothing.
Do not overwater or plant in heavy, waterlogged clay soils.
Do not apply rich fertilizers, as excess nutrients cause leggy stems.

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

Rock gardenCoastal gardenBank stabilizationGroundcover

Companion Plants

Thymus serpyllum Sedum album Festuca glauca Armeria maritima

Multiply

Propagation Methods

Good to Know

Common Questions

Biddy-Biddy questions

What zones can Biddy-Biddy grow in?

Biddy-Biddy is hardy in USDA Zones 6–9: in that range it survives winter in the ground. Colder than Zone 6, grow it in a container you can move to shelter for the winter, or as an annual. Warmer than Zone 9, winter isn't the problem: it prefers colder winters, and summer heat can shorten its life.

When does Biddy-Biddy bloom?

Biddy-Biddy typically blooms from late spring to late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Biddy-Biddy need full sun?

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

Is Biddy-Biddy drought tolerant?

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