Fertilization For Continuous Blooming on begonia
What's Happening
Begonia's continuous blooming habit (especially semperflorens varieties) creates sustained high nutrient demand. The PEBP gene family regulates flowering time, requiring optimal phosphorus (P) and potassium (K) availability for inflorescence development. Nitrogen (N) deficiency causes pale leaves and reduced blooming, while phosphorus deficiency results in dark green leaves but few flowers. Standard potting mix nutrients deplete within 3-4 months of active growth.
How to Fix It
- 1
For continuous bloomers: Feed with 15-30-15 (higher phosphorus) every 2 weeks during flowering
- 2
For foliage types: Use 10-10-10 balanced formula monthly at half strength
- 3
Apply fertilizer to DAMP soil only - never to dry soil (causes root burn)
- 4
Flush soil with 2-3 pot volumes of clear water monthly to remove salt buildup
- 5
Reduce to 1/8 strength or stop entirely during dormancy (October-February)
How to Prevent It
Apply balanced 10-10-10 or 15-15-15 fertilizer every 2-3 weeks at 1/4 strength during active growth (March-September). Switch to bloom formula 15-30-15 when flower buds appear. Always dilute more than label recommends - begonias are sensitive to salt buildup. Flush soil monthly with clear water to prevent mineral accumulation.