Botanical Name: Ageratum houstonianum ‘Aloha® Blue’ 

Common Name: Floss Flower 

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

Size: 10–14" Tall × 12–16" Wide 

Growth Habit: Compact, Mounded, Well-Branched Habit 

Sunlight: Full Sun to Partial Sun 

Soil: Well-Drained, Moderately Fertile Soil 

Water Needs: Moderate; Even Moisture for Best Performance

Bloom Season: Late Spring Through Frost 

Fertilizer: Light, Regular Feeding During the Growing Season

Features: Soft Blue Blooms, Dense Flowering, Excellent Uniformity, Pollinator Friendly 

Uses: Ideal for Borders, Edging, Containers, Window Boxes, and Mass Plantings 

Patent: ✔ Patented 

Propagation: ❌ Propagation Prohibited Without License

See our complete Ageratum Plant Guide for full care details.

More About Ageratum Aloha® Blue

Ageratum Aloha® Blue is a compact, refined floss flower bred for uniform growth and heavy flowering in smaller spaces. Its soft blue flower clusters sit just above the foliage, creating a clean, polished look that works well in both traditional and modern garden designs. Unlike taller ageratum selections, this variety stays controlled and balanced throughout the season.

Blooming continuously from late spring through frost, Aloha® Blue delivers consistent color without becoming leggy or overwhelming nearby plants. Its manageable size makes it especially useful for edging beds, lining walkways, and anchoring mixed containers where structure and scale are important.

Why We Like It (Our Trials)

In our trials, Aloha® Blue has performed reliably through heat and humidity, maintaining dense foliage and uniform flowering with minimal maintenance. Plants respond well to regular watering and light feeding, holding their shape without excessive trimming.

We value this variety for its versatility and ease of use. It blends seamlessly with brighter annuals, softens hard edges, and provides dependable blue tones throughout the growing season. For gardeners seeking a compact ageratum with modern performance, Aloha® Blue is a proven choice.

Ageratum Aloha® Blue vs. Other Ageratums

Compared to taller selections like ‘Blue Horizon’ or pollinator-focused varieties such as ‘Monarch Magic’, Aloha® Blue remains noticeably shorter and more controlled. While those varieties excel in mid-border roles with height and large flower heads, Aloha® Blue is best suited for precision planting where neat form and uniformity matter most.

For gardeners who want classic ageratum color in a compact, well-behaved plant, Ageratum ‘Aloha® Blue’ delivers consistent results season after season.