Streptocarpus have shallow root systems and are best grown in wide shallow pots using a well-drained soil-less compost.
Keep in good light but not exposed to hot sun which can cause leaf scorch. An east or west-facing windowsill is best in summer; in winter move to a south-facing position.
To increase humidity in drier surroundings stand the pots on saucers of pebbles kept moist, but do not allow the water to reach the base of the pot.
Overwatering and/or too dense a soil mix. This is really the only way one can kill most modern streptocarpus hybrids. Streps almost always will recover from lack of water, even when almost totally limp, but can be killed by continual overwatering. For this same reason, a lighter soil mix is always preferred over a heavy one.