Anigozanthos manglesii is not easy to cultivate as a perennial because of ink disease (the fungus Dreschleria irisid). It is often treated as an annual. A note on this species on the Planting ... seeds page. It is often available from nurseries in a seedling pack.
MABBERLEY, D.J. (1987/1997) The Plant Book, Cambridge University Press. HOPPER, S.D. (1993)
Kangaroo paws and catspaws : a natural history and field guide, Department of Conservation and Land Management, Western Australia.