- Mature height
- 2.5m to 3m
- Mature width
- 1m to 1.5m
Callistemon viminalis 'Slim' holds a naturally narrow upright habit just 1 to 1.5 metres wide, which makes it one of the few flowering natives that will screen a boundary in a bed too shallow for a conventional hedge. Vivid red bottlebrush flowers cover it in spring and again in autumn.
'Slim' grows to 2.5 to 3 metres tall at 20 to 40 centimetres per year, filling in densely from ground level without needing to be clipped into shape. It works as a narrow privacy screen, a driveway border, a civic mass planting, or an understorey layer beneath taller canopy trees.
This Australian native grows in full sun, tolerates light to moderate frost once established, and copes with poor soils and extended dry. The flowers are a strong nectar source for honeyeaters and native bees, and maintenance is limited to a light trim after flowering.
Frequently Asked Questions
About Callistemon viminalis 'Slim'
How tall and wide does Callistemon 'Slim' grow?
'Slim' grows to 2.5 to 3 metres tall and only 1 to 1.5 metres wide. That narrow footprint is its defining feature and the reason it is chosen for tight spaces.
How far apart should I plant 'Slim' for a screen?
Plant 80 centimetres to 1 metre apart for a continuous dense screen. Because the plant is naturally narrow, closer spacing works without the crowding that affects wider bottlebrushes.
When does 'Slim' flower?
'Slim' flowers in spring and again in autumn, carrying vivid red bottlebrush flowers. The two distinct flushes give a longer display than single-season flowering natives.
Does 'Slim' need pruning to stay narrow?
No. 'Slim' holds its narrow upright form naturally. A light trim after flowering keeps it dense and tidy, but it does not need clipping to maintain its shape.
Does Callistemon 'Slim' attract birds?
Yes. The nectar-rich red flowers are worked heavily by honeyeaters and native bees through both flowering flushes.
Is 'Slim' suitable for pots?
Yes. Its compact narrow habit suits large pots on balconies, courtyards and terraces where a tall narrow evergreen is wanted. Use a quality potting mix and water regularly through summer.
Is Callistemon 'Slim' frost tolerant?
It handles light to moderate frost once established. Protect young plants through their first winter in colder inland districts.