CVG Substrate Calculator

Mycelium requires water to grow, but it also requires oxygen. Too little water slows colonization, while too much water fills air spaces and increases contamination risk.

Hydration ratios are estimates. Actual water retention depends on coco coir brand, vermiculite grade, and how thoroughly the substrate is mixed.

• No drops: too dry
• Streams of water: too wet
• A few drops only: proper hydration (field capacity)

Field capacity ensures oxygen remains available while providing enough moisture for consistent mycelium growth.