Do Begonias Drag on the Ground?

Tuberous Begonias

• Most tuberous begonias grow from tubers -- an underground, swollen stem from which roots and new shoots eventually grow. They bloom all summer and become dormant in winter. Grown mainly for their flowers, which often look like roses, peonies or carnations, they range from 1/2 inch to show sizes of 6 or more inches. They are single or double and available in every color but blue. Some cultivars have flowers edged in different colors.

Planting

• To prevent wilting, yellowing or drooping, tuberous begonias must be properly planted in beds, containers or baskets. When planted in beds, the soil should be well-drained, rich in organic matter and sited with shade for most of the day. Early morning or late afternoon sun won't injure them, but indirect, dappled light is best. Most potted begonias do well in plastic containers, while others prefer clay. For fullness in hanging baskets, plant at least 3 tubers.

Staking

• To prevent stems from breaking on taller tuberous begonias, which can grow to 18 inches, staking is important. Stakes should be inserted when planting to avoid piercing tubers with the stake. If staking is done later, care should be taken to avoid puncturing the tuber. Plastic ties are best for tying the stems to the stakes because stems are soft and can be damaged with wire ties.

Watering and Fertilizing

• If tuberous begonias wilt, it may be due to over-watering. Between watering, they should dry out a little. But they are not drought tolerant, so water is critical when there is little rainfall. Water when the top 2 inches of the soil are dry and during the morning hours. Avoid watering leaves and flowers. When leaves start turning yellow, stop watering. For bountiful blooms, fertilize regularly using a balanced, diluted fertilizer throughout the growing season.