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There are two main reasons to divide early summer-flowering iris, like Iris germanica: either you want to make more plants and spread them around the garden or you notice that, as they spread, the middle of the clump dies off as it becomes congested. Dividing the clump gives the plants more room to grow and the old, unproductive centre can be discarded.
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Singapore Botanic Gardens
Singapore
Humble Administrator's Garden
Suzhou, China
Rio de Janeiro Botanical Gardens
Rio de Janeiro, Brazil
Royal Botanic Gardens, Kew
Richmond, United Kingdom
Dubai Miracle Garden
Dubai, United Arab Emirates
Keukenhof
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