There are no perennial begonias. There are forms that make great houseplants and will grow year-round indoors, but outdoors the plants are all unable to tolerate frost. Like Impatiens, Begonias are actually tender perennials (come back year after year) that are usually treated as annuals (gone forever at first frost). In deep shade situations, Begonias will stretch and become leggy, so do give them a spot with at least a few hours of sunlight for the best results. Following some general growing tips common to most begonias, however, probably will encourage your plants to bloom. Grow begonias in bright, indirect sunlight or dappled sunlight, preferably in an area with high humidity. Water begonias thoroughly when the top 1/2 to 1 inch of their soil feels dry. Store begonia tubers individually in paper bags or line them in a single layer atop newspaper. Place these in a cardboard box in a cool, dark, dry location. You should also be overwintering a begonia grown outdoors in containers. Pot-grown begonia plants can be stored in their containers as long as they remain dry. The main rule of thumb for watering begonias is to not let the soil dry out completely. Stick your finger into the soil, and if it dry to your first knuckle, it's time to water. Avoid overwatering, which will cause the foliage to turn yellow and eventually drop.
There's no need to throw them away when cold weather hits and the tops die. The tubers can be saved over the winter and planted again the next spring for another year of showy color. Take the following steps to save your potted tuberous begonia tubers: Remove plant from pot before hard frosts occur.
They are frost sensitive and only winter hardy in zones 8-11. In cooler climates begonias are grown as annuals and will flower from summer through fall.
do not require deadheading to thrive. Rather they self-clean by dropping spent flowers on their own. However, if you want to clean up your begonias a bit faster than nature does, or if you want to encourage the plant to produce more stems, you should get into the habit of deadheading.
When saving geraniums for the winter in pots, dig up your geraniums and place them in a pot that can comfortable fit their rootball. Prune the geranium back by one-third. Water the pot thoroughly and place in a cool but well lit part of your house.
Begonias (Begonia spp. ) are difficult to grow from seed, but the seeds themselves are quite easy to retrieve from plants at the end of the flowering period. Let the seed pods dry as much as possible on the plant, but remove them before they split open and disperse seeds on the ground.
They grow 12 to 18 inches tall and wide and thrive in part shade to full shade locations. They'll bloom from early summer until frost with clusters of slightly fragrant, light pink flowers, and they have large heart-shaped medium green leaves.
Most begonias grow best in part shade (4 to 6 hours of direct morning sun a day), or filtered sun (as through trees). Most will tolerate full shade (no direct or filtered sun), but won't be as dense and usually have fewer flowers. A few grow in full sun. They prefer moist, but not soggy, soils.
No begonia has a long life span. Most live only 2 to 3 years even with good care. The tubers of tuberous begonias often last 4 to 5 years with good care.
Once appropriately placed in the flower bed or hanging basket, deadheading spent blooms and keeping the soil moist is the basis of annual begonia care. Watering correctly is important in the care of begonias. Soil should remain moist, but not too wet. A well-draining soil or potting mix simplifies this task.
Overwintering Dahlias If you live in a cold climate it's best to overwinter dahlias. Wait until after a couple of frosts. Then, cut off the dead foliage a few inches about the soil and let the pot dry out in your garage or shed. At this point, carefully dig up the tubers and brush off all the extra dirt.
Generally, fibrous and rhizomatous begonias make excellent houseplants while tuberous begonias can be grown as houseplants but have a harder time surviving due to the need for higher humidity and light than the other two kinds. Begonias grown indoors are especially susceptible to root rot and overwatering.
Trailing-scandent begonias grow along the ground or vine up tree trunks. They can grow from 6 inches to 8 feet or more. They form roots at the nodes and can spread over large areas. Thick-stemmed begonias develop treelike stems and in warm climates can grow 20 feet tall.
Best Annuals for Overwintering These include popular garden annuals such as geraniums, coleus, wax begonias, heliotrope, and impatiens. An added benefit to overwintering these plants indoors is that not only do you get to enjoy their beauty longer, but you can also avoid having to buy them again year after year.