Cracked Stems (low humidity)
Growing conditionsLow urgency
Stems that split lengthwise or crack at the surface as the mushroom grows, often with dry-looking caps.
Likely causes
- Low relative humidity during fruiting (cracking is more likely below about 60% in wine cap)
- Fast stem growth in warm, dry air
- Dry air movement across the mushrooms
What to do
Raise and stabilise humidity around the mushrooms (about 85–95% for wine cap), mist the surrounding air rather than the caps and avoid direct airflow on the fruit bodies.
Easily confused with
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Sources
- Research on the stipe cracking of wine-cap mushroom (Stropharia rugosoannulata) in different humidity conditions (Scientific Reports (2023)). Stipe cracking linked to low humidity; at 24 °C and 70% humidity stipes grew from 4.2 to 13.1 cm in four days; cracking seen in the field at 11–23 °C.
- The rise of Stropharia rugosoannulata industry in China (Applied Microbiology and Biotechnology (2025)). Stipe cracking more likely below 60% relative humidity; fruiting humidity 85–95%.
Last updated: 2026-10-19