Keep moist until leaves emerge (5 to 14 days), and transplant outdoors after all danger of frost is past. Press seeds gently into the soil mix and don’t cover, as seeds need light to germinate. In a bed or container with rich, well-draining soil that will stay evenly moist. Ageratums are heat lovers and will fail to thrive if it’s too cold. Seeds can be sown directly outdoors after your average last frost date however, plants will not bloom until late summer or fall. Sow seed indoors 8 to 10 weeks before your last average frost date. Plant nursery starts outdoors from late spring to early summer after all danger of frost is past. Try a sun-loving combo like this ‘Across the Universe’ container recipe that includes: Angelface® Perfectly Pink angelonia, Artist® Blue ageratum, and Diamond Delight® euphorbia. On this page: The Basics | Planting | Care | Choosing the Right Ageratum | Pictures | Landscaping Tips The ornamental varieties available to home gardeners are grown as annuals, and are attractive to butterflies, hummingbirds, and insect pollinators. Billygoat weed ( Ageratum conyzoides), which has herbal and medicinal qualities, is highly invasive, primarily in Africa, but can also be found growing wild in parts of the Southern US. With sizes ranging from a few inches high to three feet tall, ageratum can be grown in containers, used as edging along pathways or borders, or massed in displays.Ĭommonly known as floss flower, this member of the Aster family includes 40 species of annuals, perennials, and shrubs native to tropical and subtropical regions of North and South America. These popular bedding plants are most often purchased as nursery starts in tray packs or flats, but can also be grown from seed. Ageratum is grown for its whimsical pompom-shaped flowers that occur mostly in shades of blue, though colors also include white, pink, lavender, and red. The color blue, a rarity in the gardening world, is highly coveted by avid gardeners. It is reported invasive in Australia and South Africa and neighboring countries (Swaziland, Mozambique and Zimbabwe) where it poses a threat to biodiversity.‘Blue Mink’ ( Ageratum houstonianum) Photo by: Tiiien / Shutterstock It is reported to be a weed and invasive outside its native range, due to its high production of small seeds with easy dispersal by wind or water.
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