Isotoma axillaris © Chris Lindorf
Isotoma axillaris © University of Melbourne
Isotoma axillaris © Chris Lindorf
Isotoma axillaris © University of Melbourne
Plant growth form and habit: A small evergreen perennial herb to subshrub. In cultivation, forms a dense mat.
Natural distribution: Australia, from south-eastern Queensland to northern Victoria, on rocky slopes or sandy soils, on both sides of the Great Dividing Range.
Indigenous to greater Melbourne: Yes
Height category: 0-0.5m
Dimensions (height and width): 0.3-0.6 m x 0.3-1 m
Landscape features: Colourful flowers, Groundcover
Flowering: Blue and white flowers, March to May and October to December.
Typical growth rate: Medium to fast
Light: Full sun, Partial sun
Drought: Poor
Waterlogging: Moderately good
Maintenance and cultivation notes: Not long-lived, should be pruned fairly hard every 2-3 years to maintain vigour. Can self-sow, best with a reliable moisture supply.
Green roof suitability: Irrigated 10-20 cm depth, Irrigated > 20 cm depth
Bees and butterflies nectar and pollen source: Attractive to native bees, butterflies, and other nectar and pollen foraging insects.
Benefits: Nectar and pollen
Typical horticultural uses: Groundcover, perennial border, edging, bush garden, wildflower garden, green roof.