It's all in the Form, for Gorgeous Container Combinations!
Upright (thriller, vertical) plants add vertical interest and a sense of height to planting arrangements, making them more lively and dynamic.
Mounding (filler, anchor) plants are used to create stability in planting arrangements. They bring a sense of balance to even the boldest combinations.
Trailing (spiller, spreading) plants are the final "accessory" in planting arrangements. They fill in gaps, soften edges and tie all the elements together for a truly finished look.