How to Grow Begonias
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Begonias add bright color and a tropical look to patios, entrances and porches with their showy, often ruffled, flowers and lush foliage. Ideal for containers, hanging baskets and window boxes, these easy-care plants grow best in the shade or partial shade, though some varieties may tolerate some sun. Begonias can also be planted in flower beds and borders. Their blooms are a welcome sign of summer—and they continue flowering until frost in the fall. If you’re wondering how to grow begonias for the first time, or refining your begonia care routine, the guidance below will help.
How to Plant Begonias
When to Plant Begonias
In cold areas, start the tubers indoors about 6 weeks before you anticipate the last frost. Start begonias indoors in late winter to early spring so plants are ready after frost. Plant the tuber in potting soil, round side down, about 2–3 cm below the surface. Water well and then keep the soil moist but not soggy. Keep in a warm, semi-shady area. When all danger of frost has passed, transplant outdoors being careful not to disturb the roots.
Where to Plant Begonias
For outdoor settings, plant begonias in garden beds with dappled light and protection from wind. They can also be grown in containers, hanging baskets, or window boxes. Begonias need rich, porous, well-drained soil and shelter from wind. Space 30 cm apart in shade or partial shade. Keep the soil evenly moist and fertilize at least once a month. Tuberous begonias should be dug in the fall and rinsed after they are lifted. They should be stored over the winter in shallow, open trays. If there may be mice or other rodents, place a wire covering over the open trays. Begonias are hardy in zone 10.
Begonia FAQs
What is the best way to grow begonias indoors?
For growing begonias indoors, start with high-quality potting mix in containers with drainage. Plant tubers just below the surface, keep temperatures between 18–24°C, and provide bright, indirect light. Maintain steady humidity with a pebble tray or humidifier and ensure good air circulation. Avoid cold drafts and heat vents. Feed monthly with a diluted, balanced fertilizer and remove faded blooms promptly to promote ongoing flowering.
How much light do begonias need to thrive?
Most begonias prefer bright, indirect light or partial shade. Morning sun with afternoon shade is ideal; intense midday sun can scorch leaves, while too little light reduces flowering. Indoors, place them near an east- or north-facing window, or set back from a bright south/west window with sheer curtains. This light guidance is a core part of begonia care. Remember, growing begonias in deep shade can lead to leggy growth, while too much direct sun can cause leaf burn.
When is the best time to plant begonias outdoors?
Plant begonias outdoors after all danger of frost has passed and soil temperatures have warmed—typically late spring. In cold regions, start tubers indoors 6 weeks before your average last frost date so they’re ready to set out promptly. This is a key step in how to plant begonias to ensure quick establishment. In mild climates (hardy only in zone 10), you can plant earlier, but still avoid cold, wet soil. Transplant on an overcast day or in late afternoon to reduce stress and minimize transplant shock.
How often should I water my begonias?
Keep the soil consistently, evenly moist but never soggy. Water when the top 2–3 cm of soil feels dry to the touch. In containers, this may mean watering every few days in warm weather; in garden beds, usually weekly, adjusting for rainfall. Always water at the base to keep foliage dry and reduce disease risk. Proper watering is essential begonia care and a cornerstone of how to care for begonias in any setting. Water less often when temperatures are cooler or light is reduced and cut back during winter.
Additional Begonia Care Tips
Caring for begonias also involves regular feeding during active growth. Use a balanced, water-soluble fertilizer at half strength every 2–4 weeks. Mulch lightly outdoors to conserve moisture and keep roots cool during hot spells. Pinch leggy growth to maintain a compact habit, and deadhead to encourage more blooms. Ensure airflow to discourage mildew, and avoid locations with standing water. These simple actions show how to care for begonias with ease.
Overwintering Begonias
In cold zones, lift tuberous begonias after the first light frost blackens foliage. Gently clean, allow tubers to dry, then store in shallow, open trays with dry peat or vermiculite in a cool, dark place (7–10°C). Check monthly for rot or shriveling. This process of overwintering begonias keeps favorites from year to year. In warm climates (zone 10), many varieties can remain in the ground with protection, but still monitor moisture. When kept indoors, cut back slightly on watering and light during the winter rest period.
By following these concise guidelines on growing and caring for begonias, you’ll master begonia care. With attention to light, moisture, and seasonal practices like overwintering begonias, you’ll know exactly how to care for begonias and enjoy months of vibrant color.
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