<p dir="ltr">From usage at <a href="http://taginfo.openstreetmap.org/tags/natural=tree#combinations">http://taginfo.openstreetmap.org/tags/natural=tree#combinations</a></p>
<p dir="ltr">I will suggest you look into:<br>
145 135 <a href="http://taginfo.openstreetmap.org/keys/diameter_crown">diameter_crown</a>=*</p>