I've yet to see a yellow rhododendron, but I guess they are around. These pick up right where the azaleas leave off. Spring is like one big party or night of fireworks because when one fades, another begins to shine.
Hydrangea paniculata is the easiest hydrangea to grow. In late summer and autumn, this rugged shrub produces fluffy clusters of white flowers that fade to shades of pink and green. Many cultivars, such as 'Tardiva', can be successfully trained into a standard, or miniature tree form -- perfect for a large container or just about any landscape spot. Name: Hydrangea paniculata Growing Conditions: Full sun or part shade and well-drained soil Size: To 10 feet tall and wide Zones: 4-8/
Dwarf fothergilla is a plant with an extended season of interest. In early spring it bears fragrant white bottlebrush blooms; in fall its leaves turn fiery red, orange, and yellow. It grows in full sun or light shade. Its bigger cousin, large fothergilla (F. major) is similar except it grows to 8 feet tall. Name: Fothergilla gardenii Growing Conditions: Full sun to part shade Size: 3 feet tall and wide Zones: 5-9/
My Monet weigela Weigela florida 'Verweig' is a compact combination of green-, rose-, and white-variegated foliage that sparkles in the shade. Pink blooms appear in summer. It grows 18 inches tall and 2 feet wide. Zones 4-8 Weigela likes a fertile, well-drained soil in full sun with adequate water, but it will also tolerate drier soils and partial shade.
Butterfly Bush Butterfly bush is like a summer-flowering lilac. The blooms appear in similar colors -- purple, lavender, blue, pink, and white -- and are deliciously fragrant. Happily, butterfly bushes offer a longer bloom season than lilacs: from summer into autumn, especially if you pinch off the old flower clusters as they start to fade. Name: Buddleia davidii Growing Conditions: Full sun and well-drained soil Size: To 10 feet tall or more Zones: 5-9
Beautiful Spring-Flowering Shrubs: Azalea. Azaleas are beautiful, beloved fixtures of Southern gardens. Happily, plant breeders have made these colorful, versatile shrubs available for gardens in nearly every region. Growing Conditions: Sun or shade, depending on type, and moist, well-drained soil Size: To 15 feet or more tall and wide, depending on type Zones: 4-10, depending on type