Garden Q&A: Should I divide and move plants in summer?

Whether you're a gardening beginner or expert, Irish Examiner columnist Peter Dowdall has the answer to your questions    

Some flowers, like irises, are best divided immediately after flowering, while aquilegias and primulas can also be shifted in early summer. File picture

Question

Can I still divide and move plants in summer, or is it too risky?

Answer

As a general rule, moving or dividing plants in full growth never ends well, as the roots are working hard and foliage is losing water faster than a stressed root system can replace it.

That said, there are some exceptions like irises, which are best divided immediately after flowering, which for some species is about now, and they'll settle in without complaint if watered well. 

Aquilegias and primulas can also be shifted in early summer, provided you're prepared to water consistently through any dry spell. 

If you are moving any plants during summer, make sure you choose a cool, overcast day, water in thoroughly, and shade the plant for a week if needed. 

In truth, October onwards remains the safer bet for almost everything else.

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