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problem: the hazel (unlike many plants) cannot fertilise itself, so needs to find another tree. How to disseminate pollen from one tree to another? Many plants use insects — bees, wasps, moths, butterflies or ants — while others draw on the services

of my favourite plants, one that is very much in evidence at this time of year (there were lots at the Chelsea Flower Show last week): the comparatively humble geum. Most of the garden varieties can trace their pedigrees back to either the Chilean Geum