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1. Planting Period   - Also called pre-cultivation or primary cultivation.   - **Key Conditions**: Maintain cultivation bag core temperature at ~23°C; keep CO₂ concentration in the cultivation room <0.1%; continuously aerate 24/7 with clean air filtered by medium or sub-high efficiency filters; maintain positive pressure to prevent external contaminated air backflow.   - **Management Focus**: Promote rapid mycelium recovery (to cover the medium surface and spread to the "lower shoulder" of the bag).   - **Post-period Steps**: Transfer bags to a heating room for further cultivation; inspect and incinerate contaminated bags in the boiler room.   2. Heating Period   - Also called secondary cultivation, lasting 25–45 days after inoculation.   - **Growth Traits**: Mycelium grows rapidly, causing bag core temperature to rise.   - **Key Controls**: Keep core temperature <24°C (to avoid mycelium burn); increase ventilation and internal circulation; control indoor CO₂ concentration at 0.3%–0.4%.   - **Maturity Sign**: When mycelium fills the bag, striped skin forms on the bag wall and the bag hardens.   3. After-ripening Period   - Also called tertiary cultivation, lasting 46–75 days after inoculation.   - **Growth Traits**: Mycelium degrades and grows inside the bag, expanding in volume; bag core temperature gradually rises to ~26.5°C (requires ample fresh air).   - **Maturity Sign**: After 70–75 days of cultivation, the bag softens and the striped skin turns yellow-brown.   - **Next Step**: Move bags to the fruiting room for fruiting management.   [Discussion]   - **Mycelium & Contamination Risk**: Deer antler mushroom mycelium is weak and has a longer recovery period than other mushroom species, making mold contamination unavoidable.   - **Contamination Handling**: Timely remove and properly dispose of contaminated bags during cultivation. For *Neurospora* contamination (often with a tartaric acid odor) in hot and humid seasons: Remove infected bags from the cultivation room before spores disperse, seal them in large plastic bags, and incinerate in the boiler.   - **Fungus Skin Issue**: Physiologically mature cultivation bags may develop uniform stripes and hardening fungus skin on the bag wall. This occurs because mycelium degradation and medium shrinkage create gaps between the medium and bag wall—aerial hyphae then connect to form fungus skin, which consumes medium nutrients and affects mushroom yield and quality.