Dianella nigra, or more commonly known as the New Zealand blueberry or Tūrutu. 

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This grass type shrub usually grows up to about 50cm tall, and 30cm wide, so is perfect for your berm as is not too high to block drivers' view. 

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In Spring and Summer they bloom with small white flowers and in violet berries appear in summer. These berries attract birds and provide them with food. 

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This species is easily grown from seed, and is best planted in moist soil. They prefer partial shade, but will tolerate full sun and dry conditions once established.

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