There are five main requirements - constant warmth, careful watering, appropriate sunlight, constant warm air and reqular alimentation. Some extra advices I can give are that: leaves should not touch the window, the overblown petals and leaves should be strictly removed, all the time (don't leave handles ). The plant should be in a small pot. When it's time to be moved in a bigger pot, use a plastic one.
SECRETS OF SUCCESS:
Temperature: Mild warmth, minimal through the winter 15 degrees. Avoid cold streams and sudden temperature differences.
Light: Bright - the perfect place in the winter is the window, east or west exposure; in summer - east. Always protect of strong sunlight. If you want violets to bloom during the winter, you should ensure them with artificial light in the nights ( if you are going to take care of them only in "false light" use 2 fluorescent tubes - 40 w and put it 30 cm above the plant, use it 14 hours per day ).
Water: Soil must be wet, use cool water, don't water the leaves. You can also float it in a bucket from time to time, but very carefully.
Humidity: High humidity is very important.You can water the whole plant without blooming. Do a drainage with stones, under the soil. When it's watered, should not be to strong sunlight, so you better do it early in the morning or after sunset.
- Straw colored spots: Too much direct light, the ending of the leaves will become yellow and little gaps may appear.
- Brown spots on the leaves: You may use too cold water.
- Yellow leaves: Maybe dry air, too much sunlight, wrong watering. Follow careful the instruction.
- Pale-green Leaves, with long handles and bended endings: The plant has frozen. As we said minimum is 15 degrees.
- Hanging leaves. The tip is carious. Too much water and changing place. It's hard to recover.
- Not blooming: Most probably not enough light, especially in winter. Other possible reason is dry or cold air.