Kohleria (Australian Bells): Vibrant, Easy-Care Gesneriad

If you love the look of gloxinias but want something more forgiving, meet Kohleria—sometimes called Australian Bells or Isoloma. This rhizomatous gesneriad produces velvety, tubular flowers in dazzling combinations: deep garnet with yellow throats, orange splashed with pink, purple-lilac dotted with green. The slightly pendulous blooms resemble colorful trumpets, and the plant flowers generously with minimal fuss.

Light: The Key to Blooms

Kohleria needs bright light—several hours of direct morning or late afternoon sun is ideal. An east or west window works beautifully. Too little light yields leggy, pale growth with few flowers. Too much midday sun can scorch leaves.

Temperature and Rest Period

Active growth: 65–75°F (16–24°C). It tolerates cool better than extreme heat; above 80°F, flowers fade fast and leaves curl. To induce a winter rest (which promotes better blooming), give 2–3 weeks at 55–60°F (12–15°C). The rhizomes will recharge for the next cycle.

Soil and Water

Use a light, fertile, slightly acidic mix (pH 4.5–6.5)—African violet soil with extra perlite works well. Water when the top inch feels dry. Never let water sit on the leaves or crown—it causes rot. The rhizomes are especially sensitive to overwatering.

Feeding and Growth Habit

Feed every 2–3 weeks during active growth with a balanced fertilizer at half strength. Kohleria grows both upright and trailing, making it perfect for hanging baskets or elevated pots where the stems can cascade.

Propagation

Easy from rhizome divisions or stem cuttings in spring. Each piece with a growth point will root quickly in warm, humid conditions.

Why Collectors Love It

Few plants offer such color diversity, long bloom seasons, and adaptability. With basic care, Kohleria rewards you with waves of exotic flowers nearly year-round.