As its common name suggests, the Australian flag iris, Orthrosanthus multiflorus, is a late spring and early summer-flowering native to southern and western Australia where it grows near to the coast.
In the UK, it can be grown outdoors in mild locations in a partially shaded or sunny position in well-drained soil, where it will put on a marvellous display of grass-like foliage topped with cornflower-blue blooms. Orthrosanthus multiflorus can also be grown in pots and containers if you don't have the right growing conditions.
For best results, grow Orthrosanthus multiflorus in full sun or partial shade and well-drained soil. Best planted in a soil-based compost, such as John Innes No 2, with leaf mould and sharp sand incorporated. If growing in pots, move the container somewhere dry and frost-free over winter before bring back outside in spring.
Plant calendar
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sow
yes
yes
yes
Plant
yes
yes
yes
Flowers
yes
yes
Divide
yes
yes
Orthrosanthus and wildlife
Orthrosanthus is known for attracting bees. It has nectar/pollen rich flowers.
