Indoor-gardening expert Esther Filson explains how to grow plants in the family Gesneriaceae, which includes African violets. Columnea (figure A) requires temperatures of 65 to 75 degrees Fahrenheit and bright reflected light. Keep the soil moist at all times, and provide humidity by placing the plant on a gravel-filled saucer (a humidity tray) or keeping it in a humid room such as a bathroom or the kitchen. These moisture-loving plants also appreciate a daily misting. The genus Episcia (figure B), or flame violet, includes six species of creeping evergreen tender perennials. Provide rich, fast-draining soil and plenty of humidity. Streptocarpus (figure C), or Cape primrose, requires care similar to that for the African violet but prefers more light and cooler temperatures (70 to 75 degrees). Streptocarpus will grow happily in potting mix designed for African violets. Provide filtered bright light and a humidity tray. Don't mist Streptocarpus. To encourage bloom, provide a high-phosphorus liquid fertilizer diluted to half strength every two weeks. Streptocarpella (figure D) is a subgenus of Streptocarpus and requires the same care but blooms more profusely. African violets (Saintpaulia) require a south-facing exposure without direct sun. Repot annually, using a soilless mix designed for Saintpaulia; apply an African violet fertilizer regularly, according to package directions. These plants appreciate the use of a humidity tray. Cold water causes leaf spots, so if you're watering from the top, make sure the water is warm. Sinningia (figure E) grows from tubers and requires only moderate amounts of water until the roots are established. Keep the soil damp during the growing season, irrigating with tepid water. Sinningia requires bright reflected or filtered light and cool temperatures (60 degrees). Apply a high-phosphorus fertilizer once a month from the end of the plant's flowering period until the foliage dies down. Gloxinia (figure F) are now included in the genus Sinningia; they require the same care. Provide bright light: an east- or northeast-facing window works well. Fluorescent lighting is beneficial too. If you use fluorescent bulbs, keep plants 6" to 8" from the fixture for 14 hours a day.
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