Tropical Hibiscus
Hibiscus rosa-sinensis or Chinese Hibiscus
Tropical Hibiscus produces large funnel-shaped flowers which are single or double. The large flowers are up to 6 inches in diameter with yellow stamens and pistil on glossy green leaves. The flower colors are white and various shades of orange, yellow, pink and red.
These fast growing plants make excellent specimen plantings, for patios and do well in containers with proper moisture.
Plant tropical hibiscus when all danger of frost has passed. They are not fully winter hardy and need protection when temperatures fall below 45 degrees and are often treated as annuals. They perform best in well drained, moist fertile soil with pH of 6.5-6.8 and in full sun. These fast growing plants are easily propagated by seeds, cuttings and grafting.
Root rot can be a problem with poorly drained clay soils. Sand and organic matter such as peat moss can be used to amend clay soils. Control insect such as aphids, mealy bugs and thrips with insecticidal soaps and horticultural oil sprays.
Rose Mallow
Hibiscus moscheutos
Large dinner plate size flowers bloom in summer in white, red and pink on large to medium sizes shrub.
Container grown plants can be planted April to July. Rose mallow hibiscus is easily grown from seed and should be planted in full sun on average soil. Fertilize in Spring and in June or July with a general purpose fertilizer.
These plants begin to look tired and flowering stops in the Fall. The plant should be cut back and will begin to send up shoots next Spring.
Caterpillars make holes in the leaves and are controlled with B.t. Whiteflies can decrease plant vigor and are controlled with insecticidal oil.
submitted by Karen Blackburn