'Bottle Rocket' Ligularia
This zone 4-9 perennial likes part sun, so it should do well in this shady area. It produces a very bright yellow bloom around midsummer which I think will help to add some color to this section of the garden.
'Silk Sunset' Coleus
This annual likes shade and will grow to about 10-13 inches. I liked the colors and thought it will add something beyond green in the garden.
It is an annual, so it will need to be replaced next season.
Zinnia (Profusion Yellow, Fire, and White)
I added some Zinnia to the garden. I've always liked the flowers and colors on these and have added some each year.
If I can keep the slugs at bay, they will do fine and add some temporary diversity to the garden.
Overall, the garden is doing pretty good. Its seems to be at its height of color for this summer.
Still need to fill in behind Buddha and I am planning on trimming back the Japanese Maple - a major undertaking.