1. It's not human made.
2. It's not animal.
3. Yes it is a plant.
4. Yes it has leaves.
5. It's often used as food but not by people.
6. Yes parts of it contain seeds.
7. It's leaves do not change color in the fall.
8. It's not a flower nor does it flower.
9. Some of them are used decoratively.
10. Sometimes they may have a pleasant smell.
11. Smaller than a bread box.Although some of them can grow quite tall.
12. It is not a tree.
ok I wont count the chia pet as a question, but it is not a chia pet