Phormium cookianum, or more commonly known as Mountain Flax, or by its Maori name; Wharariki.

 

​These plants grow up to 1m height and width.​ They prefers full sun, as they don't do well in shade. They will tolerate both dry and wet. 

 

Plant before summer, so the plants have a good chance to develop their root system​ before the soil dries out. 

 

​Plant approximately 1m apart, and water well. 

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These plants would be great to include in your berm as their flowers provide nectar to feed native birds such as Tuis and Bellbirds.