Reverted by user in
https://www.openstreetmap.org/changeset/147123352

In reply to private message;

Leaf cycle/type is mainly useful for landuse areas (wood, forest, etc.) as individual trees are usually not mapped there unless they have some status as mentioned before. Where individual trees are mapped, leaf cycle becomes largely redundant, except where the species(/genus) is unknown or uncertain and users see value in keeping an indication of what it is. It is also much easier to determine.
( is:
- https://wiki.openstreetmap.org/wiki/Tag:natural%3Dtree#Use_of_redundant_tags )
Divisions such as 'noble' are less likely to be used by contributors than height, diameter, leaf cycle/type and (even) denotation. Currently, they would mostly be thrown in with denotation=natural_monument(/landmark/avenue..).
( is:
- https://wiki.openstreetmap.org/wiki/Tag:natural%3Dtree#Subtag_denotation_to_indicate_the_significance
- https://wiki.openstreetmap.org/wiki/Tag:natural%3Dtree#Fallen_trees
)
I would suggest discussing addition of specific tags in the general community forum so you get insights from the wider community.
https://community.openstreetmap.org/c/general/38/none
If they're okay with the community, you can document them on the wiki
https://wiki.openstreetmap.org/wiki/Creating_a_page_describing_key_or_value