Gypsum Regular Grade | Organic Fruiting Substrate Supplementation

Maximise your harvest potential with our Regular Grade Gypsum (Calcium Sulphate), a premium organic mineral additive specifically selected for optimising mushroom fruiting substrates. While our fine-grade version is specialized for grain spawn, this regular grade Gypsum offers a more economical solution for large-scale substrate preparation without sacrificing quality. It serves as a fundamental supplement that ensures your mushrooms have the structural and nutritional foundation required for high-yield flushes.

The Role of Gypsum in Substrate Optimisation

In the fruiting stage, the physical consistency of your bulk substrate is vital. Integrating Gypsum into your mix—whether you are using coco coir, straw, or hardwood pellets—helps prevent substrate clumping and improves aeration. This improved structure allows for better water distribution and oxygen exchange, creating the ideal environment for robust mycelium development. Chemically, gypsum acts as a pH buffer, stabilising the environment as the mycelium grows and metabolic byproducts are produced.

Pure Nutrition for Professional Results

Our organic Gypsum is 94% pure and provides a potent source of essential minerals:

• 23% Calcium: Strengthens fungal cell walls and aids in the transport of nutrients.
• 17% Sulphur: Supports enzyme activity and protein synthesis for vigorous growth.

Whether you are a hobbyist cultivating at home or a professional grower managing a commercial facility, using Gypsum in your substrate preparation is a proven method to enhance mushroom production and overall fruit body quality. By choosing our 94% pure organic sourced gypsum, you ensure your cultivation setup remains free from unwanted synthetic additives, keeping your gourmet mushrooms as natural as possible.

- Calcium Enrichment: Gypsum supplies vital calcium, strengthening cell walls and supporting healthy mushroom growth.

- Improved Substrate Structure: By preventing clumping, gypsum ensures a loose, aerated substrate, facilitating efficient colonisation.

- pH Stabilisation: Gypsum helps maintain a stable pH level, creating an optimal environment for mycelium proliferation.

Incorporate up to 5% gypsum by dry weight into your mushroom substrate mix for best results. For example, add 50 grams of gypsum to 1 kilogram of dry substrate components.

250g – Great for hobbyists & small batches
500g – Ideal for regular growers
1KG – Cost-effective for ongoing projects
2KG – Best value for larger or frequent grows

• We ship from Tamborine Mountain, QLD using either AusPost or Aramex
• Fast dispatch within 1 business day (excluding Fridays) with express post options available