I did this after folding several kusudamas. It was an extension of my proficiency in folding multiple lilly flowers with leftover orange, red and pink paper. The complementary tone of the twisted copper gives the "texture" of a bark of a tree.
I lost count of how many actual flowers there are.
Each are pinched at their base with a thin copper wire, which is then twisted onto a slightly thicker copper wire "branch". Each branch is then twisted/attached to the trunk, which was made of even thicker copper wire. The roots were moulded around a bowl which by the end were strong enough to support the whole tree without the presence of the bowl.
This piece was donated to the office, after I left the position.