What common mistakes kill bonsai trees?
Written by
Michael Sullivan
Reviewed by
Prof. Martin Thorne, Ph.D.Overwatering is the number one killer of bonsai. When the soil is wet, it suffocates the roots, which causes them to rot beyond recovery. Avoid this situation by checking the moisture level before watering. Place your finger in the soil to about 1" depth. It should only be watered if it feels dry around that depth.
Soil Selection Errors
- Garden soil compacts suffocating roots
- Use well-draining bonsai-specific mixes
- Ideal blend: akadama pumice lava rock
- Repot every 2 years minimum
Improper Pruning
- Removing over 30% foliage causes shock
- Never prune during dormancy or stress
- Use concave cutters for clean wounds
- Disinfect tools between each cut
Disregarding temperature needs creates an instant decline. Tropical species become significantly stressed at temperatures below 50°F, and temperate trees lose their necessary winter chill. Place thermometers near your bonsai and position them in each location according to the season. I saved my eucalyptus tree (ficus species) by moving it from the cold windowsill!
Poor tools can result in entry points for infection. Always maintain the sharpness of your pruners before use. Between trees and bonsai, clean blades with alcohol. Jagged cuts should heal slowly and provide invitations for disease. Invest in bonsai-specific tools for precise work.
Prevent these mistakes through consistent observation. Check trees daily for early warning signs. Address issues immediately, document care routines. Your attention creates the foundation for decades of healthy growth.
Read the full article: How to Care for Bonsai Tree: Essential Guide
