Growing flowers in a greenhouse extends the productive season of the plants. It allows you to start your gardening earlier in the spring and to keep your flowers blooming longer in the fall. Heated greenhouses create a year-round growing season. Most greenhouses rely on solar heat and lighting, but electric heating and lighting sources are also an option.
Greenhouses give flowers the benefit of putting their roots in an ideal soil mixture customized for each individual flower. Temperature, humidity and water are on a regulated schedule. The flowers in a greenhouse are protected from the harsher conditions outside.
Amazon lily (Eucharis grandiflora) is a summer flowering tropical bulb. Mounds of hosta-like, black-green leaves reach 24 inches in height. Fragrant white lily blossoms appear on top of tall flower stalks. Amazon lilies are extremely sensitive to temperature; anything below 68 degrees F will injure the lily. Amazon lilies do best when grown in containers in a greenhouse.
African violets (Saintpaulia ionantha) come in thousands of different types. Jade green, round leaves are covered with small hairs. Small red, blue, purple, lavender, pink, white and bi-color blossoms appear throughout the year.
African violets are reproduced through leaf cuttings since they do not grow true to type by seed propagation. These violets thrive in soil with low nutrients and enjoy high humidity. One way to raise the humidity is to wet the area below the growing bench of the African violets. Do not get the leaves wet since it causes leaf spotting.
Chenille plant (Acalypha hispida) is an upright flowering shrub that grows 5 to 6 feet tall. Oval, green leaves are 6 to 8 inches long and cover the stems. Flowers resemble a cattail and form 18-inch-long drooping clusters. These cattails are bright red and appear on the female plants. Chenille plants adapt to most types of soil as long as the soil provides the plant with good drainage. Prune the plant back to the desired size after it has stopped flowering.
Chinese hibiscus (Hibiscus rosa sinensis) is a tropical flowering plant that is very sensitive to cold. Green, glossy leaves have slightly ruffled edges. White, pink, red, yellow, apricot and orange blossoms offer summer color. The blooms are 4 to 8 inches across. These flowers last only 1 day before wilting away. Provide Chinese hibiscus with well-draining, nutrient-rich soil and plenty of water.