Plectranthus ernestii Bonsai: Care for Beginners

About Your Bonsai

Plectranthus ernestii (sometimes called "Cuban Oregano" or "Succulent Coleus") is a tropical mint-family plant, not a true Swedish ivy. It's grown as a bonsai for its thick, sculptural stems and aromatic leaves.

Essential Care

• Light: Sunny windowsill (south/west). More light = better growth. No leaf loss in winter unless neglected.
• Water: Let top ⅕ of soil dry between waterings. Water until a trickle exits drainage holes. Critical: Pot must have drainage holes; no glued pebbles.
• Fertilizer: Monthly at half strength. Skip in winter.
• Humidity: Misting unnecessary.

Bonsai-Specific Maintenance

• Prune monthly: Trim most new growth to maintain size/shape. This is how bonsai stay miniaturized.
• Don't repot often: Keep in same pot indefinitely. Disturb roots minimally.
• Flowers: Pinch off if they spoil the bonsai aesthetic (optional).

Troubleshooting Yellowing Leaves

Yellowing after a care change usually indicates light or watering adjustment stress. Stick to the guidelines above. Recovery takes weeks. This species is challenging for beginners—patience is essential.

For a bonsai care article, email wcreed@HorticulturalHelp.com.