How to Grow Begonia Seedlings


Fibrous root begonias, also known as wax begonias, are propagated from seed. The seeds are exceptionally small and have a low germination rate, so many people prefer to purchase nursery-grown seedlings for their gardens. If you would like to experiment with starting your own begonia seedlings or are in need of a large amount of bedding flowers for less money, starting your own begonia seedlings may be worth it. Plant more seeds than the amount of plants you need to make up for the low germination rate.

Step 1

Fill a seed starting tray with a sterile potting mix. Water the mix until it is evenly moist throughout but not soggy.

Step 2

Sow begonia seeds in rows 3 inches apart directly on the soil surface. Seed in rows as thinly as possible because of the small size of the begonia seed.

Step 3

Mist the surface of the soil with water in spray bottle, taking care not to wash the seeds under the soil surface. Cover the trays with plastic wrap and place them in a warm, well-lit room.

Step 4

Remove plastic wrap once seedlings emerge, approximately 10 to 15 days after sowing. Place seedlings in a warm, brightly lit window or under grow lights that are positioned 4 inches above the tops of the seedlings.

Step 5

Thin seedlings to one plant every 4 inches once they produce their second set of leaves. Cut off the weaker seedlings at soil level using small scissors and leave the strongest plants to continue growing.

Step 6

Keep the soil moist at all times. Transplant begonias outside once all danger of frost has passed or into individual pots once they produce their third set of leaves.

Tips and Warnings

  • Fungus is the main issue with begonias. Avoid over watering and treat any fungal infection immediately with the correct organic or chemical control. Double flower begonia varieties are sterile. They can only be propagated from cuttings.

Things You'll Need

  • Tray
  • Potting mix
  • Spray bottle
  • Plastic wrap
  • Scissors


  • University of Missouri Extension
  • University of Florida Extension
Keywords: growing begonia seedlings, wax begonia, planting begonia seeds

About this Author

Jenny Harrington is a freelance writer of more than five years' experience. Her work has appeared in "Dollar Stretcher" and various blogs. Previously, she owned her own business for four years, selling handmade items online, wholesale and via the crafts fair circuit. Her specialties are small business, crafting, decorating and gardening.