Decide how tall you want your topiary and cut or break the dowel at the desired length.
Take your olive sprays and attach them to your dowel with the brown floral tape. You may need to trim off some of the lower branches and add them in at the top for a fuller look.
Wrap the stems around the dowel and decide if you need more texture to create a more realistic looking trunk. If so, unwrap the tiny grapevine wreath and wrap pieces of this around the dowel, as well, securing with the brown floral tape.
Next, push the dowel into the floral foam or styrofoam.
Stand back and look at the topiary from all angles. Add in more branches, if needed.
If you need to blend the floral tape, dowel and stems a little, dab some brown paint all over everything.
Finally, cover the base of the topiary in moss, potting soil or burlap.