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underplanting hydrangea

Underplanting hydrangea is a fantastic way to maximise the beauty and health of your garden borders, beds or shaded areas. Whether you grow mopheads, panicles or lacecaps, hydrangeas are known for their lush foliage and showy blooms – but they can leave bare ground beneath. By carefully underplanting hydrangea with compatible ground cover plants, you’ll create a fuller tapestry of foliage, help suppress weeds, and add seasonal colour that complements your main shrubs. This page covers the best plant choices, top tips, and creative ideas for underplanting hydrangea in New Zealand gardens.

Leptinella pusilla (Purple Brass Buttons)

Leptinella pusilla is a low growing evergreen groundcover valued for its delicate fern like foliage and ability to form a dense carpet of greenery. The fine textured leaves create year round interest and help soften pathways, rock gardens, and garden edges.

Buy Leptinella pusilla (Purple Brass Buttons)

From $12.95

Suited to regions: All regions

Plant type: Groundcover Plants

Height: 10 cm

Spread: 70 cm

Flowering time: Spring, Summer

Tolerances: Coastal, Hardy

Garden uses: Borders, Containers, Ground covering, Living areas, Paths & Steps, Ponds, Pool areas

Garden styles: Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Modern, Native, Tropical

Black Polythene - 1 m Wide

Black Polythene - 1 m Wide is a practical plastic sheeting option for garden, nursery, and landscaping applications. The black finish helps block light, making it useful for covering soil and suppressing unwanted plant growth.

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From $138.40

Why Underplant Hydrangeas?

Hydrangeas often have an open framework at their base, which is perfect for tucking in groundcovers that thrive in similar conditions. Underplanting hydrangea helps to:

Keep roots cool and moist, which hydrangeas love
Prevent weed growth in those hard-to-reach shady spots
Provide all-year visual interest, even when hydrangeas are dormant
Attract beneficial pollinators and reduce soil erosion

You’ll need to choose companion plants that enjoy partial shade, humus-rich soil, and enough moisture—mirroring the preferences of hydrangeas themselves.

Top Plant Choices for Underplanting Hydrangea

Selecting the right ground cover is essential. Look for varieties that won’t compete aggressively, but will fill in the space with a lush, layered effect.

1. Pimelea prostrata 'Blue Peter'

This New Zealand native forms a dense mat of blue-green foliage that’s perfect for underplanting hydrangea. Pimelea prostrata 'Blue Peter' offers subtle colouring beneath the dramatic blooms of your hydrangeas, thrives in partial shade, and brings resilience to exposed conditions.

2. Isotoma fluviatilis

Looking for a soft, low carpet with a delicate look? Isotoma fluviatilis, also known as blue star creeper, weaves between stems with tiny stars of blue or white from spring to autumn. It tolerates shade and moisture, making it ideal for underplanting hydrangea in tricky, damp corners.

3. Pachysandra terminalis

Classic and dependable, Pachysandra terminalis brings evergreen coverage where other groundcovers might fail. Its glossy green leaves provide a neat frame for hydrangeas through every season, thriving in the shaded, cool soil beneath mature shrubs.

4. Vinca Elizabeth Cran

The trailing stems and lavender-blue flowers of Vinca Elizabeth Cran brighten shady garden spots while anchoring the soil. This tough performer delivers colour and density, ensuring your underplanting hydrangea effects last well into winter.

How to Successfully Underplant Hydrangea

To achieve the lush, layered garden look, follow these simple steps:

Prepare the soil by adding compost or mulch to enrich nutrients and texture.
Space groundcovers generously to allow for mature spread under the hydrangea canopy.
Water well, especially during establishment and dry seasons.
Choose underplanting varieties with similar moisture and shade needs.

You might also interplant roses for a brighter hit of seasonal colour—consider Rose Flower Carpet Scarlet as a cheerful companion for summer.

Create a Harmonious Woodland Garden

Thoughtful underplanting hydrangea not only fills gaps but brings year-round structure, texture and biodiversity to your borders. Explore your choices Pimelea prostrata 'Blue Peter', Isotoma fluviatilis, Pachysandra terminalis, and Vinca Elizabeth Cran to build a garden that’s as practical as it is beautiful, tailored to New Zealand conditions. Happy gardening.

Contact us

Whether you need assistance finding the plant you’re looking for or you simply want to know more about who we are and what we do, we invite you to get in touch with us today. A member of The Plant Company team will get back in touch as soon as possible.

underplanting hydrangea

Leptinella pusilla (Purple Brass Buttons)

Black Polythene - 1 m Wide

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Why Underplant Hydrangeas?