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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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Kirstenbosch National Botanical Garden
Cape Town, South Africa
Dubai Miracle Garden
Dubai, United Arab Emirates
Desert Botanical Garden
Phoenix, Arizona, USA
Eram Garden
Shiraz, Iran
Shinjuku Gyoen National Garden
Tokyo, Japan
RHS Harlow Carr
Harrogate, United Kingdom