The global Spent Mushroom Substrate Market was valued at approximately USD 1.95 billion in 2023 and is projected to reach USD 3.82 billion by 2032, expanding at a CAGR of 7.9% during 2024–2032. In 2022, the market stood at USD 1.81 billion, reflecting a year-over-year growth of 7.7% in 2023. Rising mushroom production, circular agriculture initiatives, and soil health investments are driving measurable demand increases worldwide.