Ageratum houstonianum

Ageratum houstonianum is a herbaceous perennial plant but it is mostly treated as an annual in most gardens. Interestingly Ageratum in Greek means long-lived. It is also known as Mexican Paintbrush, Flossflower, BlueMink, Blueweed, or Pussyfoot. It is a very popular plant in beddings and landscapes in Southern California. Ageratum houstonianum is native to Central America, in particular Mexico, Guatemala, and Belize. It is part of the Asteraceae family of plants.

Mexican Paintbrush has a long flowering period and a unique color that complements the pinks, reds, and yellows of other flowers, perhaps that makes it a popular flower to mix in borders. The flowers appear from May to November and they are violet-blue in color, they appear in dense corymbs. Ageratum houstonianum grows from 6 to 24in or 15 to 60cm.

Ageratum houstonianum
Ageratum houstonianum or Mexican Paintbrush

Plant Ageratum houstonianum in the sun in moist, humus-rich soil but well-drained. It does not like to dry out but it needs to be well drained. It can tolerate some shade.

Ageratum houstonianum
Ageratum houstonianum or Floss Flower

Ageratum houstonianum or Mexican Paintbrush is toxic to grazing animals as it contains pyrrolizidine alkaloids that cause liver damage. It attracts butterflies but it is deer and rabbit resistant. Ageratum houstonianum is easy growing and you can propagate from seed. You can deadhead the flowers to keep it tidy but not as critical as it blooms for a long period.

Ageratum houstonianum
Ageratum houstonianum

About Online Flower Garden & Dino

I am a flower enthusiast and a gardener at heart. Ever since childhood I loved reading about plants and started gardening at an early age. First by helping my father in the garden and later managing a large garden myself in my teen years. I planted and cared for a large number of plants, flowers, and trees both outdoors and in a greenhouse. To this day I enjoy visiting gardens and parks and learning about new and old specimens and varieties of plants.

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