Botanical Name: Ageratum houstonianum ‘Monarch Magic’

Common Name: Floss Flower

Hardiness Zone: Annual in Most Climates (USDA Zones 2–11)

Size: 18–24" Tall × 18–24" Spread

Growth Habit: Upright, Well-Branched, Bushy Habit

Sunlight: Full Sun to Partial Sun

Soil: Prefers Well-Drained, Moderately Fertile Soil

Water Needs: Moderate; Consistent Moisture for Best Performance

Bloom Season: Late Spring through Frost

Fertilizer: Light, Regular Feeding During Growing Season

Features: Soft Lavender-Blue Blooms, Large Flower Heads, Excellent Monarch & Pollinator Attraction, Heat Tolerant

Uses: Ideal for Pollinator Gardens, Annual Beds, Mixed Borders, and Containers

Patent: ✔ Patented

Plant Patent: PP36,798

Propagation: ❌ Propagation Prohibited Without License

More About Ageratum ‘Monarch Magic’

Ageratum ‘Monarch Magic’ is a standout floss flower selection bred specifically for superior pollinator attraction and garden performance. It produces large, fluffy clusters of soft lavender-blue blooms held well above the foliage, creating a bold yet airy presence in the landscape. Unlike older ageratum varieties that stayed short and were used primarily as edging plants, ‘Monarch Magic’ offers meaningful height and structure.

This variety was selected with monarch butterflies in mind, producing abundant nectar that attracts not only monarchs but also bees, skippers, and other beneficial insects. The flowers are long-lasting and continuously produced from late spring until frost, providing reliable color and pollinator support throughout the growing season.

Why We Like It (Our Trials)

In our trials, ‘Monarch Magic’ has proven to be a strong, dependable annual with excellent heat tolerance and consistent flowering. It performs best in full sun to light shade with regular watering, maintaining a full, bushy habit without becoming leggy or collapsing mid-summer.

Pollinator activity is where this plant truly earns its name. Monarchs frequently visit the blooms, and the constant insect activity adds life and movement to garden beds. We also appreciate its versatility—it works just as well in pollinator-focused plantings as it does in mixed annual beds or larger containers where height and texture are needed.

Ageratum ‘Monarch Magic’ vs. Traditional Ageratum

Compared to classic dwarf ageratum varieties often used as low borders, ‘Monarch Magic’ is taller, more robust, and far more impactful in the landscape. Traditional types tend to form tight, low mounds with smaller flower heads, while ‘Monarch Magic’ delivers larger blooms, improved branching, and greater pollinator value.

For gardeners looking to move beyond basic edging plants and add real structure, color, and wildlife interest to their annual plantings, Ageratum ‘Monarch Magic’ is an exceptional upgrade.