My grandfather, Royce Spinkston, fought at Gallipoli and later in France, during WWI. He abhorred war, and was much happier gardening. The German sword below ( Deutsche Maschinenfabrik, A-G, Duisburg ), which I suppose came home with him as a trophy, was used in his garden as a stake, a much better purpose than the one for which it was made.
A hotel broker, he helped found the Australian Iris Society in 1948, and became its first Honorary Secretary and Editor. It seems that he was also Australia's major importer of irises ( his favourite flower ) at that time. A good part of my own interest in gardens has come to me through him. He wrote a vast number of letters too, so perhaps that trait is also genetic.