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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Monet's Garden, Giverny
Giverny, France
Keukenhof
Lisse, Netherlands
Saint Petersburg Botanical Garden
Saint Petersburg, Russia
Kirstenbosch National Botanical Garden
Cape Town, South Africa
Vallarta Botanical Garden
Vallarta, Mexico
Butchart Gardens
British Columbia, Canada