Grow Golden Oriole in full to partial sun, in zones 5 to 8. It becomes 6 feet in height, with a spread of 4 to 6 feet. Grow Gibraltar in partial sun, in zones 5 to 8. It becomes 5 to 6 feet tall, with a spread of 4 to 6 feet, after 10 years. Stewartstonian becomes 4 to 5 feet tall, with a similar spread. Grow it in partial shade, in zones 5 to 8. This shrub becomes 6 to 10 feet tall, with a similar spread. Grow flowering quince in full sun, in zones 4 to 9. Flowering maple (Abutilon x hybridum) is so called because it bears lovely flowers and has leaves shaped like those on a maple tree (Acer spp.). Flowering maple can be grown outdoors year-round only in USDA plant hardiness zones 9 to 10. It becomes 8 feet tall and wide. Grow it in full sun to partial shade.
Red bird of paradise (Caesalpinia pulcherrima)Yellow bird of paradise (Caesalpinia gilliesii)
Caesalpinia plants bloom March through October in hot climates. But Rose of Sharon (which commonly flowers in pink, white, or lavender) is not the only kind of hibiscus that is hardy. A related plant actually goes by the common name, “hardy hibiscus” (Hibiscus moschuetos). Hardy hibiscus also blooms in late summer (both plants like full sun). It is a perennial that becomes 3 or 4 feet tall and wide, but it’s often treated as a shrub. Disco Belle (Hibiscus moschuetos ‘Disco Belle’) is one type that offers red flowers. But another attractive type of hardy hibiscus is the Summerific Perfect Storm (Hibiscus moschuetos ‘Summerific Perfect Storm’). This gorgeous plant need not take a back seat even to its cousin from the tropics, Hibiscus rosa-sinensis when it comes to sheer beauty. But Hibiscus rosa-sinensis does provide another option for Northerners who want red flowers and don’t mind bringing a plant indoors for the winter. Fewer gardeners have heard of scarlet rosemallow (Hibiscus coccineus) because it is not quite as hardy (only zone 6). But if you live in zones 6 to 9, this plant is well worth growing for its deep red flowers. Select a location in the sun or in partial shade for it. The plant has a height of 5 to 8 feet, with a spread of 2 to 3 feet. The genus is native to Australia. Other kinds of Callistemon exist, as well, and all are plants that attract hummingbirds and bloom mid-summer to late summer. For example, Callistemon viminalis ‘Neon Pink’ has deep pink blooms. Suited to zones 8 to 11 and full sun, it is a fast-growing shrub. When mature, it stands 8 to 12 feet tall, with a width of 8 to 10 feet.
‘Scarlet Ribbon’ (red flowers)‘High Gold’ (yellow flowers)‘Tango’ (orange flowers)
‘Double Red’ (double flowers, ranging in color from scarlet to magenta)‘Tomato Red’ (orange-red color)‘Don Fernando’ (flowers with both red and orange in them)
But there are also types with yellow or orange flowers, including:
‘California Gold’ (golden flowers)‘Orange King’ (orange flowers)
Because the showy feature on Bougainvillea is a bract, not a true flower, it is long-lasting and furnishes color for most of the year in hot climates.
