Tanacetum parthenium Rio | Feverfew

Brilliant white Feverfew with long stems, abundant flowering, and exceptional bouquet-filling performance.

Tanacetum parthenium 'Rio' is a premium Feverfew variety bred for professional cut flower production. It produces masses of bright white, well-filled semi-double flowers that create an elegant, airy appearance in bouquets and floral arrangements. Its clean white blooms add freshness, texture, and volume, making Rio an indispensable filler flower for wedding floristry, garden-style bouquets, and natural floral designs.

Rio develops long, strong, well-branched stems reaching 60–80 cm, providing outstanding productivity and consistent quality throughout the season. Suitable for year-round greenhouse production, this variety delivers reliable harvests with excellent stem quality and abundant flowering.

Its vigorous branching and generous sprays of blooms create natural movement and fullness, making Rio a favourite among flower farmers and professional florists.

Plant Details

• Botanical name: Tanacetum parthenium
• Common name: Feverfew
• Variety: Rio
• Plant type: Hardy annual / short-lived perennial
• Flower colour: Brilliant white
• Flower type: Semi-double
• Plant height: 60–80 cm
• Stem length: 60–80 cm
• Days to maturity: 75–90 days
• Growing location: Greenhouse or field
• Sowing period: Year-round under protection
• Light: Full sun
• Vase life: 7–10 days fresh; excellent for drying
• Use: Cut flowers, bouquet filler, dried flowers, cottage gardens, borders, pollinator gardens

Sowing Instructions

Sow seeds 8–10 weeks before the last expected frost or throughout the year for greenhouse production.

Surface sow the pelleted seeds and do not cover, as light is required for germination. Maintain temperatures of 18–21°C (64–70°F).

Seedlings are generally ready for transplanting after 4–5 weeks.

For outdoor production, sow from February to May for flowering later the same season, or sow during August to September for overwintering and blooms the following year.

Growing Tips

Grow in full sun and fertile, well-drained soil.

Rio naturally produces excellent branching, creating numerous flowering stems with exceptional uniformity and continuous blooming throughout the season.

After the first flush of flowers, cut plants back to ground level to encourage fresh growth and additional harvests.

In mild climates, plants may overwinter and flower again in subsequent years.

Harvest

Harvest stems when approximately 75% of the flowers on each spray are fully open for maximum vase life and post-harvest quality.

For dried flowers, allow all flowers to fully open before harvesting.

Why You'll Love Rio

• Premium florist-quality Feverfew
• Brilliant white semi-double blooms
• Long, strong stems (60–80 cm)
• Excellent branching and abundant flowering
• Adds texture and volume to bouquets
• Ideal filler flower for weddings and natural-style floristry
• Suitable for year-round greenhouse production
• Excellent fresh and dried cut flower
• Reliable, consistent harvests
• Easy to grow from seed
• Perfect for flower farms and cutting gardens

Tanacetum parthenium Rio is a reliable, high-performance Feverfew that combines brilliant white blooms, long stems, and exceptional branching. Its abundant flowering and elegant appearance make it an essential filler flower for professional florists, flower farmers, and gardeners looking to create beautiful, natural-style bouquets throughout the season.