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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Gardens of the Generalife, Alhambra
Granada, Spain
Majorelle Garden
Marrakesh, Morocco
Gardens of Versailles
Versailles, France
Singapore Botanic Gardens
Singapore
Royal Botanic Gardens, Kew
Richmond, United Kingdom
Butchart Gardens
British Columbia, Canada