What exactly are wall shrubs?

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

Professor Buczacki is a horticultural expert, writer ...

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

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