[Tagging] Arboretum - how to tag?

[Warin]

Hi

I have an arboretum, Way: Arboretum (628753725), that is part of a 
nature reserve and within a tree covered area. I assume that there is 
more than one species of tree.

How to correctly tag it?

At the moment it has

landuse=yes (what brought it to my attention)

name=Arboretum

Clearly both these tags are incorrect.
I have confirmed that it is anarboretum so at least that bit is true.