Begonia

Genus Begonia, with more than 1000 different species, exhibits bright and beautiful flowers. It has a wide variety of shape and color. This sort of plant has a long flowering period, and is easy to cultivate. It has been used as ornamental plants or garden decoration for a long history. A few of these species are available for medicinal use. 
This kind of plants live in warm, humid and semi-shade environment. Being not resistant to cold and drought, the suitable temperature for its growth is around 20-25℃. It requires humus and slightly acidic soil. 
When raising Begonia plant, you need to take some precautions to prevent diseases. Before planting, disinfect the soil and keep the environment clean. Remember to clear the wilting plants in time, in order to reduce the growth of bacteria. 
The brown patches on the leaves may indicate that the plant is infected by some bacteria. To solve this problem, you can water and fertilize properly to make the plant strong, thus improve the resistance to disease. You may need to avoid watering from the top of plant, as water drop can help the spreading of bacteria. It is also necessary to remain some space between plants. 
Powdery mildew is also need to be prevented. Powdery mildew will infect leaves of Begonia and formed irregular white patches on the leaf surfaces. It may cause fallen leaves and stunted flower. As Begonia plant is usually cultivated in shelter or greenhouse, excessive humidity and temperature will cause epidemic of powdery mildew. In long rainy weather, this disease is more likely to occur. 
You may also improve ventilation in the shelter. Add organic and compound fertilizer, in order to improve plant disease resistance. 
To reduce the incidence of disease, seedlings collected in nearby markets or in the field should be strictly checked, in order to remove infected plants as far as possible.
You can also use commercial pesticides to deal with injurious insect. And you may examine the flower in time to take precautions at the early stage of disease. Otherwise, it will cause a waste of manpower and material resources.

3-6 hours of sun per day, with protection from intense mid-day sun

Water moderately, allowing the top 3cm to dry out between watering.

Begonia

Begonia

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