Garden designer Alison Jenkins in her Somerset smallholding
12.07.2023 - 11:43 / gardenersworld.com
Ageratum is a member of the Asteraceae or Daisy family. The genus includes many perennial and annual species from the tropical regions of the Americas, particularly Mexico. The name Ageratum comes from the Greek ageratos meaning ‘not growing old’: a reference to the flowers which retain their colour for a long time.
Ageratum houstonianum was named after the Scottish botanist and physician, William Houston, who collected seeds in the early eighteenth century. This half-hardy annual, also known as the Mexican paintbrush or floss flower, has long been a popular bedding plant in the UK. More recently, taller varieties have become increasingly grown for cutting.
Floss flowers bloom from July to October, attracting a range of pollinators, especially butterflies. They are included in the 99 best butterfly nectar plants in Dr Margaret Vickery’s Gardening for Butterflies. Several varieties such as ‘Blue Danube’ and ‘Blue Mink’ are listed as RHS Plants for Pollinators.
These vibrant bedding plants are one of only a small number of true blue annuals, although ageratum can also have white, purple and pink blooms. The flower heads are soft and fuzzy with each rounded cluster comprising a mass of tiny florets. It is, however, worth noting that ageratum is toxic and can be harmful to humans, grazing animals and pets if eaten.
How to grow ageratumAgeratum needs a sheltered, sunny spot, though it will also tolerate light shade. Providing soil is fertile and well-drained, this versatile annual will grow in acid, neutral or alkaline conditions. Bedding plants can be bought in spring and transplanted into the garden after the last frost. Many varieties are available to buy as seed.
Where to grow ageratumCompact varieties of ageratum such as
Garden designer Alison Jenkins in her Somerset smallholding
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