Monty Don Quotes
No apple is reliably self-fertile, so each tree needs a pollinator. A neighbour may well have an apple that will do that for you, but it is better to always plant at least two trees to be certain of pollination.
Citations
Don, Monty. The Complete Gardener. Dorling Kindersley, 2003.
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Montagu Denis Wyatt "Monty" Don OBE is a British broadcaster and writer on horticulture who is best known as lead presenter of the BBC gardening television series Gardeners' World since 2003.