In message , gray
writes
I am due to go on holiday to New York, USA.

Does anybody known of any good garden centres, that are easily
accessible and not too far away from New York that sell a good range
of top fruit and nut trees.

Also any good gardens or orchards that are open to the public to
visit.

Any website address's please.

I have googled, but cannot find anything that is easily accessible by
bus routes etc from New York.

New York State or City? Where exactly will you be staying?
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Gopher .... I know my place!