New for 2015, 'XXL Sunset' is a dahlia from the Dummen Group of plant growers. Its bicolored blooms really are extra-large, measuring 4 inches across. These sun-loving plants have scored high in garden trials across the U.S.
Limbo 'Pink Morn' Petunia
You could say 'Pink Morn' petunias made bicolors cool before—well, before bicolors were cool. Introduced about a decade ago, these plants with pink petals and white centers have a mounding growth habit.
Gaillardia Galya 'Blazing Sun'
Gaillardias are the 2015 Perennial of the Year, says the National Garden Bureau. 'Blazing Sun' offers bicolored blooms of deep red and hot yellow for beds or containers; it's hardy to USDA zone 5.
Coleus 'Chocolate Splash'
Don't limit yourself to flowers when you're looking for bicolors. Coleus 'Chocolate Splash' is a foliage plant that adds mint-green and chocolate-brown color to shady spots. The plants also have good resistance to heat and humidity.
'Snappy Orange and Yellow' Snapdragon
Pair 'Snappy Orange and Yellow' (Antirrhinum majus) with pansies to brighten early spring or fall flowerbeds. These snapdragons tolerate frost and hold their sunny good looks even in the wind and rain. The plants grow 8 to 10 inches tall and need full sun to produce their best blooms.
Supertunia 'Pretty Much Picasso'
Get artsy with your bicolored garden when you grow 'Pretty Much Picasso' petunias. The vibrant purple flowers are edged in light green; try combining them with white alyssum and lime-colored sweet potato vines for a big impact.
Hibiscus Summerific 'Cherry Cheesecake'
Luscious 'Cherry Cheesecake' rose mallow has ruffled, dinner plate-sized blooms. This bicolored beauty adds color to the late summer garden with splashes of magenta and cherry red.
Abelia 'Sunny Anniversary'
Not all bicolored flowers are bold and bright. Abelia 'Sunny Anniversary' blooms in softer shades of yellow and pinkish-orange from midsummer into early fall.
Lantana Luscious 'Citrus Blend'
Lantana 'Citrus Blend' loves the heat, blooming vigorously even when the mercury rises. The plants grow 24 to 36 inches tall; grow them in masses for a jolt of bold orange-red and yellow.
Superbells 'Cherry Star'
Calibrachoa Superbells 'Cherry Star' has been a top performer in many university, extension and trial gardens. The sun-loving plants are covered from spring until frost with hundreds of pretty pink and yellow blooms that look like small petunias.
Superbena 'Peachy Keen'
Use verbena 'Peachy Keen' as a trailing plant in hanging baskets, window boxes or other containers. Give it plenty of sun and its pink and salmon-coral blooms will keep coming until frost.
Calibrachoa Superbells 'Blackberry Punch'
Hummingbirds love Superbells 'Blackberry Punch' with its two-tone blooms of deep purple and near-black. These calibrachoas don't need deadheading and bloom prolifically until frost.