I got some pre-made wire armature trees on Aliexpress. Pretty good and cheaper than making them. The figure with the tree is 1/35, so the tree is just over 4" tall. The other tree is smaller and I added the foliage.
To be honest, the tree without leaves to use as a basic start looks fine but I think you adding the foliage is what makes this a really top piece! Nice job!
A while back, I gutted an old extension cord for the copper wire, specifically to make tree armatures. The bark looks like celluclay, which is ground up cardboard, which is pulp from a soft wood tree.
Now I wonder if, with practice, I could make a tree like that in three minutes from garbage. A lot of really useful things go into the garbage.
To be clear, I am not making fun of the trees under discussion here. There is a chapter on wire armature trees in the terrain modeling book I am currently reading for the third time. The author turns all sorts of junk into genuinely good looking terrain and flora.