A fast growing plant, Prostanthera lasianthos adapts to diverse conditions in the garden, being at home in light or heavy soils and in sunny or shaded positions, even heavy shade.
Prostanthera lasianthos is moderately frost-hardy and can withstand some snowfall.
It can be pruned into different shapes and old plants can be rejuvenated this way; plants that are not pruned can otherwise become top-heavy.
Flowering occurs in November in the Canberra region—earlier than in Victoria.
Suckering has been observed.
It can be propagated by seeds or taking cuttings of firm young growth.
Seed stored for longer than three months at room temperature often fails to germinate.

Cultivars include 'Kallista Pink', a tall pink-flowering form that flowers profusely, and 'Mint Ice', a form with variegated foliage, both from the Dandenong Ranges in Victoria.
Another tall cultivar, 'Liffey Falls' has lilac flowers.
A fast growing plant, Prostanthera lasianthos adapts to diverse conditions in the garden, being at home in light or heavy soils and in sunny or shaded positions, even heavy shade. Prostanthera lasianthos is moderately frost-hardy and can withstand some snowfall. It can be pruned into different shapes and old plants can be rejuvenated this way; plants that are not pruned can otherwise become top-heavy. Flowering occurs in November in the Canberra region—earlier than in Victoria. Suckering has been observed. It can be propagated by seeds or taking cuttings of firm young growth. Seed stored for longer than three months at room temperature often fails to germinate.
Cultivars include 'Kallista Pink', a tall pink-flowering form that flowers profusely, and 'Mint Ice', a form with variegated foliage, both from the Dandenong Ranges in Victoria. Another tall cultivar, 'Liffey Falls' has lilac flowers.
Prostanthera lasianthos