Penicillium (Blue-Green Mold)

Blue-green powdery mold, often with a white border, on grain or substrate.

Likely causes

• Contamination
• Damp storage

What to do

Dispose of the block; review sterile technique and air quality.

Easily confused with

• Green Mold (Trichoderma)

Not sure?

Walk through the troubleshooting guide, ask the AI Grow Consultant, or check the conditions your species needs on its species page.

This entry is general growing guidance compiled from extension and trade practice; it has no single citation yet. Treat it as a starting point.

Last updated: 2026-10-19