Ageratum

Ageratum (floss flower) forms low mounds of soft, powder-puff blue, mauve, pink and white clusters from summer to frost — a neat edging and container annual that bees love.

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Ageratum seeds — fluffy blue cushions all summer

Ageratum, the floss flower, forms low mounds smothered in soft, powder-puff clusters of blue, mauve, pink or white from early summer until the frosts. These tidy, long-flowering annuals sit comfortably within our annual flower seed range. New to flowers? Our flower growing guide gets you started.

Few flowers hold true blue as well as ageratum — the calendar shows when to sow.

An edging and container classic

Compact and neat, ageratum is made for the front of a border or a pot, earning its place among our container-friendly flowers, while the nectar-rich clusters draw in bees and butterflies as one of our bee-friendly flowers.

Growing ageratum from seed

Sow under cover in early spring, barely covering the fine seed, and keep it warm and bright. Plant out after the last frost into full sun or light shade, water in dry spells, and pinch off faded heads to keep the cushions covered in colour right through summer.

Planning a low-edging scheme? Here's where to look next.

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Is ageratum an annual or perennial?
In our climate ageratum is grown as a half-hardy annual, sown fresh each spring and flowering until the first frosts. How tall does ageratum grow?
Most garden types stay compact at around 15–30 cm, making them ideal for edging, the front of a border and containers. When should I sow ageratum seeds?
Sow under cover in early spring, barely covering the fine seed, and plant out after the last frost. See our flower sowing calendar for timing. Does ageratum attract pollinators?
Yes — the nectar-rich clusters are a magnet for bees and butterflies through summer.