Swan River Daisy

About Swan River Daisy

Swan River Daisy is a delicate Australian annual producing masses of daisy-like flowers in shades of blue, purple, pink, and white throughout summer. Growing to just 30cm tall with finely divided, feathery foliage, this charming plant creates a soft, cottage-garden effect in borders, containers, and hanging baskets. UK gardeners prize it for its long flowering season, low-maintenance nature, and ability to thrive in our cool summers. The profusion of small blooms attracts bees and butterflies, making it an excellent choice for wildlife-friendly gardens.

UK fact: Swan River Daisy performs exceptionally well in the cooler British climate, often flowering more prolifically here than in its native Western Australia, where intense heat can shorten the blooming period.

Watering Swan River Daisy

Water regularly to keep the soil consistently moist but never waterlogged, particularly during dry spells and for container-grown plants. In the ground, established plants need watering two to three times weekly during typical British summers, increasing to daily during heatwaves. Container specimens dry out quickly and may need daily watering in warm weather. Reduce watering if prolonged rain is forecast, as soggy conditions can lead to root rot and reduced flowering.

Sunlight requirements

Swan River Daisy flowers most prolifically in full sun but tolerates partial shade, particularly in southern England where afternoon shade can prevent stress during hot spells. In Scotland and northern regions, choose the sunniest spot available to maximise flowering. South or west-facing positions are ideal, though avoid very hot, dry spots against south-facing walls where plants may struggle.

Soil and feeding

Swan River Daisy thrives in well-drained soil that doesn't become waterlogged, making it ideal for sandy or loamy soils. Heavy clay soils should be improved with grit and organic matter to enhance drainage. The plant tolerates a wide pH range from slightly acidic to slightly alkaline (pH 6.0-7.5). For containers, use a good-quality multipurpose compost mixed with extra perlite or grit to ensure excellent drainage.

Feed container-grown plants fortnightly with a balanced liquid fertiliser from June through September to maintain continuous flowering. Plants in the ground rarely need feeding if planted in reasonably fertile soil, though a single application of general-purpose fertiliser in midsummer can boost performance. Avoid high-nitrogen feeds which promote foliage at the expense of flowers.

Pruning Swan River Daisy

Deadhead spent flowers regularly throughout the summer to encourage continuous blooming and maintain a tidy appearance. Pinch out the growing tips of young plants in late May to promote bushier growth and more flower stems. If plants become leggy or flowering slows in midsummer, trim back by one-third to rejuvenate growth and stimulate a fresh flush of blooms. Remove entire plants after the first frosts have blackened the foliage in autumn.

Propagating Swan River Daisy

Sow seeds indoors in March or April at 15-18°C, barely covering them with compost as they need some light to germinate. Seedlings typically emerge within 10-21 days and should be pricked out into individual pots once large enough to handle. Harden off gradually in a cold frame for 10-14 days before planting out after all risk of frost has passed in late May or early June. Alternatively, sow directly outdoors in late April or May where plants are to flower, thinning seedlings to 20-30cm apart once they're large enough to handle.

Common problems

Swan River Daisy is relatively trouble-free but can suffer from aphid infestations, particularly on young growth in spring and early summer; treat with insecticidal soap or encourage natural predators. Powdery mildew may appear in humid conditions or where air circulation is poor, especially on container plants; improve spacing and avoid overhead watering. Overwatering or poorly drained soil can lead to root rot and damping off, causing plants to collapse. Slugs and snails occasionally damage young plants in wet weather, so protect seedlings with organic slug pellets or barriers.

Spot a problem with your plant? Photograph the affected area using the Loam app and it will suggest the most likely cause and treatment.

Safety

Humans

Safe

Cats

Safe

Dogs

Safe

Toxicity information is for general guidance only.

Seasonal care calendar

Monthly care guide for Swan River Daisy in the UK, based on average conditions.

Frequently asked questions

When should I plant Swan River Daisy in the UK?

Plant Swan River Daisy outdoors after all risk of frost has passed, typically from late May in southern England and early June in northern regions. For earlier flowers, sow seeds indoors in March or April and transplant hardened-off seedlings in late May.

Why has my Swan River Daisy stopped flowering in midsummer?

This often indicates the plant needs deadheading, more frequent watering, or a light trim to rejuvenate growth. The Loam app can send you timely reminders for deadheading and help diagnose specific issues based on your plant's conditions and recent weather patterns.

Can Swan River Daisy survive winter in the UK?

No, Swan River Daisy is a half-hardy annual that will be killed by the first frosts. Treat it as a summer bedding plant, enjoying its flowers from June to October, then remove and compost plants in autumn. You'll need to sow fresh seeds each spring for the following year's display.

Related plants

• Ageratum
• Alyssum
• Lobelia
• Nemesia
• Petunia