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But I do find that nurseries are a lot cheaper, and the plants do tend to be
a lot more reliable.

Nurseries tend to specialise, whereas garden centres generalise. This
can lead to a thinner layer of knowledge among the garden centre staff
because they have such a vast species stocking policy. If you want the
best expert advice and opinion you should go to the experts - those who
grow rather than just sell.

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Compo - Still here.