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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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Koishikawa Korakuen Gardens
Tokyo, Japan
Aswan Botanical Garden
Aswan, Egypt
Desert Botanical Garden
Phoenix, Arizona, USA
Royal Botanic Garden Sydney
Sydney, Australia
RHS Harlow Carr
Harrogate, United Kingdom
Kirstenbosch National Botanical Garden
Cape Town, South Africa