To provide visual interest to a container garden, follow the concept of planting flower pots
Gardening By The Moon: Container Plantings Ideas — Harvest
Thrillers, Spillers, and Fillers
Summer Containers - Organic Potting Soil - Organic Mechanics Soil
How to Arrange Pots According to Thriller Spiller Filler Technique, Container Gardening Ideas
Tips for successful pots and container gardening in Texas.
How Do You Create a Container Garden? Start Here. - The New York Times
Planting a Combo Pot: Creative Ideas for Container Gardens in Mississippi, Pine Hills Nursery
Container Gardening 101: Thrillers, Fillers, And Spillers
5-thriller-filler-spiller-example - White Flower Farm's blog
Thrillers, Fillers, and Spillers: Design Ideas for your Garden Pots
Container Gardening Explained, Pt. 1