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When are onions ready to harvest? What is damaging lilac leaves? Read on…

Professor Buczacki is a horticultural expert, writer, and former chair of Gardeners' Question Time

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John is a gardening legend and here to answer your lovely questions

There is a plum tree growing wild on wasteland with delicious fruits borne on its many suckers. If I dig up a sucker can I grow this tree in my garden or do I have to make a graft? Self-seeded plum tr