Blue Bouquet Ageratum is a compact, bushy cultivar of Ageratum houstonianum that fills gardens with delicate blue flowers from early summer through fall. Growing 18 to 24 inches tall and 12 to 18 inches wide, this heirloom variety reaches full bloom in 84 to 91 days from seed, making it reliable for mid-summer color and beyond. Deer leave it alone, and pollinators visit it eagerly, adding living movement to beds and borders throughout the season.
Full Sun
Moderate
10-11
24in H x 18in W
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Low
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Blue Bouquet produces soft, fluffy blue flowers that create a gentle haze of color in the garden, blooming steadily from June through November. The plant tolerates moderate watering and thrives in full sun, adapting well to typical garden conditions without fussiness. It germinates quickly indoors (5 to 14 days) when started at the right temperature, rewarding early planters with flowers by mid-summer.
Blue Bouquet Ageratum serves as a flowering accent in garden beds, borders, and mixed containers. Its compact mounding habit makes it useful for edging paths, filling gaps between taller plants, or creating a soft color layer in pollinator gardens. The long bloom season and pollinator appeal make it valuable in gardens designed to support bees and butterflies throughout summer and fall.
No timeline data available yet for this variety.
Sow seeds indoors 6 to 8 weeks before your last frost date. Keep soil at 75°F until germination occurs (5 to 14 days), then lower the temperature to 60 to 65°F. Water from below by setting containers in a larger tray of water and allowing them to drain; this prevents damping off and avoids disturbing the tiny seeds. Seeds require light to germinate, so press them lightly into the soil surface without covering.
Harden off seedlings gradually over 7 to 10 days before moving them outside. Transplant after your last frost date when soil has warmed. Space plants 1 inch apart for a densely planted effect, or adjust spacing based on your desired mature plant size of 12 to 18 inches wide.
Direct sow about 1 to 2 weeks after your last frost date. Press seeds lightly into the soil surface; they need light to germinate. Thin seedlings as they grow, spacing them 1 inch apart initially, then thinning further if needed for larger plants.
Pinch back young plants when they reach a few inches tall to encourage branching and a bushier, more compact mounding habit. Deadheading spent flowers throughout the season extends blooming and maintains a tidy appearance.
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