Dianella

Australian Plants Society Victoria lists Dianella tasmanica, Dianella revoluta, and Dianella longifolia as fire retardant. The society uses that term for plants that resist the first wave of a bushfire but can burn once dry. Its lists draw on members’ experiences during fires; they are not presented as a set of identical laboratory tests.

The same source warns that even these plants will not protect a property during an extreme bushfire. That limits the meaning of the favorable listing rather than contradicting its initial-flame distinction.

Fire and Emergency New Zealand separately gives Dianella nigra a low-flammability classification. The sources differ in both the species named and how they describe fire performance. For Dianella, a favorable classification or listing should stay attached to its botanical name and source conditions, rather than becoming a promise that every flax-lily will resist sustained fire.