1.Create a polygon the width of the base of the trunk with at least 16 sides.
2.Right click on the sweep button. Change segments to 10.
3.Sweep, move around until satisfied. Sweep again. When satisfied with trunk. Select object button.
4.Create a small polygon, this is for the branch. Sweep until satisfied.
5.Place branch on trunk. Shrink along axis as needed.
Leaves
6.This is a hard part. To create the shape, take the spline polygon, have segments at 10, then do the basic shape. Here is the shape I used:
7. You can color any way you want. It's a judgment call.
8. After aligning all the leaves, and coloring everything, you are finished. Here is my tree: