I did this back home in my garden!!! I had an old chair very similar to this style, but it was a rocker, and had old, distressed, vintage green paint and no seat. I filled it with geraniums and it looked awesome!
Add 1 tsp. of liquid food coloring to 1 cup of water. Drizzle the colored water onto the soil surrounding the base of a plant. Wait 24 hours for the water to absorb. Apply another identical dose if the color change was not sufficient.