How deep to plant begonia bulbs
Begonias work well anywhere you want a show of colourful blossoms and foliage--from borders to pots. Many home gardeners enjoy planting bulb varieties known as tuberous begonias. You'll find many colourful choices that will thrive in partially shaded placements.
Choose large, firm bulbs, or tubers--the best choice to achieve larger flowering plants. Generally, smaller tubers will yield a smaller plant. Avoid bulbs that appear dry.
Indoors or Outdoors
Decide where and when you want to plant your bulbs. If you live in a cool climate and want to enjoy a maximum season of blooms, use indoor pots and start them approximately eight weeks before you expect the last spring frost.
How to Plant
Place the rounded side of the begonia tuber facing down in well-drained potting soil. The hollow side of the bulb should face up. Cover the bulb with 1/2 inch of soil. Keep them warm, around 21.1 degrees Celsius, and place in filtered light.
Water and Light
Water your tubers enough to keep them moist. Too much water may cause the tubers to rot. Once they sprout, choose a sunny window for your begonia sprouts, or use fluorescent lights to grow a full, bushy plant.