An east-facing garden will receive the early morning light and would be considered "partial sun." The amount of light will depend on other factors such as your climate and the surrounding structures. In warmer climates, an east-facing garden can protect many partial sun plants from the intense afternoon heat. In cooler climates, it may allow you to grow plants that require more shade. For a healthy garden, select plants that grow in your climate in your conditions.
Covered with dainty, pink, blue or white flowers from early spring into summer, cranesbill geranium will thrive in your east-facing flower bed. According to North Carolina State University, cranesbill grows in well-drained soil and partial sun in USDA hardiness zones 3 through 8. This herbaceous perennial will grow to 15 inches tall and wide and quickly spread to create a colourful ground cover. The leaves are deeply lobed and in shades of green or greyish-green, tinging pink or maroon in the fall.
Also known as Heuchera, this compact plant is grown for its foliage as well as the stalks of tiny, bell-like flowers that bloom in the summer. Coral bell flowers tower over foliage that can be shades of green, purplish-bronze, silver, red, yellow or variegated. This perennial has a mounding habit and grows only to 18 inches tall and wide. It blooms in full sun or partial shade, making it perfect for your east-facing garden. The flowers bloom in shades of pink, red and white. This plant is hardy from USDA zones 3 to 8.
Bellflower is a perennial plant that bears purple, bell-shaped flowers in late summer. Also known as Campanula or Harebell, this is a low-maintenance plant requiring well-drained but moist soil in partial or full sun. Bellflower will die if the soil is not well-drained. This flower will attract hummingbirds to your east-facing garden. According to the University of Maryland, you should deadhead the spent blooms for a longer flower display. Depending on the cultivar, bellflower can grow from 1 to 6 feet high in USDA hardiness zones 3 through 9.