Streptocarpus plants thrive indoors in containers, if they have temperatures between 50 and 90 degrees F and bright light, though not direct sunlight. Choose from a variety of hybrids that grow compactly and produce flowers in blue, violet, red, pink or white. Also called Cape primroses due to their origin on the Cape of Good Hope, streptocarpus are similar to African violets. They're sensitive to excess heat and improper watering and will wilt under the wrong conditions.
Check the temperature of the room where you have the streptocarpus using a thermometer. If the temperature is over 90 degrees F, move the plant to a location in the range of 60 to 80 degrees F. Keep the soil barely damp but be careful not to over-water while the plant is recovering.
Feel the soil below the surface by gently sticking your finger down a few inches. If the soil is wet and the temperature is under 90 degrees F, the streptocarpus may be wilting from over-watering or poor drainage. Discontinue watering it until the soil is almost dry and, if necessary, re-pot it into soil with better drainage. If the soil is dry when you first feel it, the plant may be wilting from too little water. Water the plant by filling the pot's saucer and letting the soil soak up the water from below. Pour out any excess water from the saucer after an hour or two.
Prevent future wilting by letting the plant soak up water from its saucer rather than watering it from above. Keep the soil damp to the touch but don't over-water until it becomes soggy. When temperatures approach 90 degrees F or if the plant stops growing in cooler temperatures, water it less, keeping the soil barely moist.