"Hibiscus rosa-sinensis is a bushy, evergreen shrub or small tree growing 8–16 feet tall and 5–10 feet wide, with glossy leaves and solitary, brilliant red flowers in summer and autumn. The 5-petaled flowers are 4 inch in diameter, with prominent orange-tipped red anthers.
It is widely grown as an ornamental plant throughout the tropics and subtropics. As it does not tolerate temperatures below 50 °F, in temperate regions it is best grown under glass. However, plants in containers may be placed outside during the summer months.
Numerous varieties, cultivars, and hybrids are available, with flower colors ranging from white through yellow and orange to scarlet and shades of pink, with both single and double sets of petals.
Despite its size and red hues, which are attractive to nectar-feeding birds, it is not visited regularly by hummingbirds when grown in the Neotropics. Generalists, like the Sapphire-spangled Emerald, Amazilia lactea, or long-billed species, like the Stripe-breasted Starthroat, Heliomaster squamosus, are occasionally seen to visit it, however. In the subtropical and temperate Americas, hummingbirds are regularly attracted to it."
Taken from wikipedia's page at: http://en.wikipedia.org/wiki/H...