Native brooms (Carmichaelia species) are nitrogen-fixing plants. Nodules on their roots contain bacteria that change nitrogen in the air into a form the plant can use. At the start of most primary successions, there is little or no available nitrogen in the ground. Nitrogen-fixing plants are among the few species that can grow on such nutrient-deficient ground.
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Te Ara - The Encyclopedia of New Zealand
Photograph by Alastair McLean
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