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Rock Isotome

Isotoma axillaris

Rock Isotome
Photo: Unknown author, CC BY-SA 3.0

Rock isotome (Isotoma axillaris) is a small upright perennial from eastern Australia, known for its star-shaped blue to mauve flowers that appear mostly from September to May. It grows well in well-drained soil in a sunny spot and handles light frost better than heat-and-humidity combined with poor drainage.

Family
Campanulaceae (Campanul family)
Grows as
Perennial
Light
Full sun, Part shade
Water
Water regularly during dry spells and let the top of the soil dry slightly between waterings to avoid rot.
Soil
Free-draining, gritty or sandy soil; rock garden or lean mix suits it well.
Temperature
10–28 °C; tolerates light frost but should be protected from hard freezes.
How easy
Easy

About

Isotoma axillaris, commonly known as rock isotome or showy isotome, is a small herbaceous perennial in the family Campanulaceae. It usually has blue or mauve star-shaped flowers from September to May. It may also be called blue star, star flower, or laurentia.

Where it grows

Showy isotoma occurs in Queensland, New South Wales and Victoria, often in moist crevices on rocky outcrops.

Other Lithotoma plants

Isotoma anethifolia · Rock Isotome · Lithotoma

Text excerpted from the Wikipedia article Isotoma axillaris by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

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