What level do you need to be to unlock next set of trees?

I have looked all over for this info and am not finding it. Im currently level 20 and in need of some walnut logs from level 25 trees.

What level do I need to be to see the level 25 trees?

I was stuck (so I thought) the same way on mining with it ending at level 30 nodes even though my level was 30. What I found, is the next set of node levels finally popped after I mined one of each of the previous items on the list.

So basically, complete your current list and the next set of items should pop.

Well found my own answer once I hit level 21. Should have looked at my traits. Tree whisper III is level 21 for level 25 trees.

to be able to mine some bracket you actually need to be in that bracket
that means, to be able to log 31-35 you have to have atleast 31 lvl, for 21-25 you have to have atleast 21 lvl etc etc etc
Tree whisper have nothing to do with it, its the trait allowing you to find "+" nodes where if you meet the condition of said node you will get for example +5% to HQ bonus