[Tagging] key trees

[Warin]

Hi,

According to the OSMwiki the key tree;


1) is to be used for plants ... that would include shrubs and grasses.


2) is to be used to define what is growing in an orchard.


3) has been 'approved'?


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I would suggest it would be better


If this is only for use with the key landuse=orchard then a sub key such 
as orchard=berry_tree, * would be better?