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Asclepias physocarpa (Hairy Balls)

Swan Plant, Swan Plant

Asclepias physocarpa, commonly known as Hairy Balls, is a unique perennial shrub best known as a host plant for Monarch butterflies. Its balloon like, spiky green seed pods and clusters of small white flowers make it a striking addition to New Zealand gardens. Valued for both its ornamental appeal and ecological importance, Hairy Balls attracts Monarch butterflies to lay eggs and provides food for caterpillars, making it essential for butterfly friendly gardens.

Asclepias physocarpa plant with green balls and a monarch butterfly caterpillar.
Asclepias physocarpa plant with green balls and lush foliage.

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Suited to regions:Subtropical, Temperate
Plant type:Shrubs
Height:1.50 m
Spread:60 cm
Flowering time:Spring, Summer, Autumn
Tolerances:
Garden uses:Living areas, Pool areas
Garden styles:Backyard, City & Courtyard, Frontyard, Japanese, Modern, Rock
Easy to grow?Yes
Maintenance requirementsLow
Growth rateMedium
Also known asSwan Plant, Swan Plant
Sku10661

How to grow Asclepias physocarpa (Hairy Balls) in NZ

To grow Asclepias physocarpa (Hairy Balls) in NZ, select a sunny, sheltered location with well drained soil. Plant in spring once frosts have passed for best results. Water regularly during dry spells and apply a general purpose fertiliser to encourage lush growth. This plant is fast growing in the warmer months and will often self seed, ensuring a steady supply of plants. Asclepias physocarpa is ideal for supporting Monarch butterfly populations across NZ.

Asclepias physocarpa (Hairy Balls) care tips

Caring for Asclepias physocarpa (Hairy Balls) is straightforward. Regular watering during summer keeps plants healthy and productive. Mulching around the base helps retain soil moisture and suppress weeds. Caterpillars of Monarch butterflies feed heavily on the foliage, which is natural and beneficial. Remove seed pods if you wish to reduce self seeding, or leave them for a continuous supply of new plants. Hairy Balls is hardy and low maintenance, requiring little extra care.

Asclepias physocarpa (Hairy Balls) size, spacing, and growth rate

Asclepias physocarpa (Hairy Balls) typically grows 1–2 metres tall and 80–100 cm wide, forming an upright, shrubby habit. Space plants 70–100 cm apart to allow for healthy growth and caterpillar activity. Growth is fast in the warmer months, and the plant often completes its life cycle within one or two seasons. With its unique form and rapid growth, Asclepias physocarpa quickly makes an impact in NZ gardens.

Landscaping uses for Asclepias physocarpa (Hairy Balls)

Asclepias physocarpa (Hairy Balls) is perfect for butterfly gardens, lifestyle blocks, and educational plantings in schools. Its unusual balloon like seed pods provide visual interest, while its flowers add a delicate charm. It is often planted alongside other nectar rich plants to create a pollinator friendly environment. Asclepias physocarpa is an excellent choice for gardeners wanting both ornamental beauty and ecological value in their landscapes.

Why buy Asclepias physocarpa (Hairy Balls) from The Plant Company?

Purchasing Asclepias physocarpa (Hairy Balls) from The Plant Company ensures you receive strong, healthy plants grown under NZ conditions. As New Zealand’s most trusted plant nursery, we are dedicated to supplying only premium quality plants. Each Asclepias physocarpa is carefully nurtured and packaged to arrive safely. With expert advice and fast nationwide delivery, The Plant Company is your best choice for adding Hairy Balls to your butterfly friendly garden or outdoor space.

Questions and Answers

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