How to Grow Termite Mushroom (Termitomyces albuminosus)

• 1 lb dry rye berries or wheat berries
• Water for soaking and simmering
• 1 large grain bag with 5-micron filter patch
• Pressure cooker, 15 PSI capable

Scale-up: 3 lbs grain → 3 bags | 5 lbs grain → 5 bags. Out-Grow also carries sterilized grain bags ready to inoculate if you want to skip this step.

Measure 1 lb of dry rye or wheat berries and submerge them in a pot of cold water. Soak for 12 hours, then drain and transfer to a pot of fresh water. Simmer on low heat for 15–20 minutes until kernels are cooked through but still intact — they should give slightly when pressed but not split or burst. Drain in a colander and spread the grain across clean towels, tossing occasionally, until the surface is completely dry to the touch with no surface moisture visible. Load the grain into your filter-patch grain bag, filling it no more than two-thirds full. Seal the bag by folding and heat-sealing or clamping the top. Load into the pressure cooker and sterilize at 15 PSI for 90–120 minutes. Allow the cooker to return to zero pressure naturally, then let the bags cool completely on a clean surface before proceeding — grain that is still warm will kill the liquid culture on contact.

• Termitomyces albuminosus liquid culture syringe — 10 cc
• Cooled, sterilized grain bags from Step 1
• 70% isopropyl alcohol and clean paper towels
• Still-air box or flow hood
• Needle and syringe (included with liquid culture)

Work inside a still-air box or under a laminar flow hood. Wipe the injection port on each grain bag with 70% isopropyl alcohol and allow it to dry for 30 seconds. Flame-sterilize the needle until red, then let it cool for 10 seconds. Inject 3–5 cc of Termitomyces albuminosus liquid culture into each 1 lb grain bag through the injection port. Out-Grow's Termite Mushroom liquid culture is available ready to inject. After inoculation, shake or knead the bag gently to distribute the liquid culture across the grain. Set bags upright in a clean location away from direct light.

• Inoculated grain bags
• Colonization space held at 72–79°F (optimum 79°F)
• Ambient humidity 55–65% RH
• Thermometer / hygrometer

Place the inoculated grain bags in a dark or low-light space held at 72–79°F and 55–65% RH. These temperature targets are derived from mycelial growth studies on Termitomyces albuminosus using agar media, and represent the best available guidance for colonization — not bag-specific documented parameters. Do not open the bags. Check daily for signs of mycelium spreading from the inoculation points. Healthy mycelium on grain appears dense and pure white. Shake the bags once when you see roughly 20–30% colonization to distribute growth more evenly across the grain. No light is required during colonization.

Days to full colonization are not documented in the literature for this species. Based on the known mycelial growth temperature range, expect colonization to be slower than faster-growing species. Do not rush to move bags to substrate until the grain is uniformly white throughout, with no uncolonized pockets visible.

• 4 lbs hardwood sawdust pellets
• ¾ lb wheat bran
• ¼ lb gypsum
• Approximately 5½ cups water
• Large grow bag with 0.2-micron filter patch (XLST)
• Pressure cooker, 15 PSI

Scale-up: 3 bags multiply all amounts by 3 | 5 bags multiply by 5. Out-Grow carries wood-based mushroom substrate bags pre-made if you prefer to skip mixing.

In a large mixing bowl or bucket, combine hardwood sawdust pellets, wheat bran, and gypsum. Gradually add water while mixing until the substrate reaches field capacity (a handful squeezed firmly releases only one or two drops). The substrate recipe is derived from general hardwood mushroom substrate practice, as no documented substrate formula for Termitomyces albuminosus production bags appears in the accessible literature. Load the mixed substrate into a large grow bag, leaving 4 inches of headroom above the substrate. Seal the bag with an impulse sealer or by clamping. Sterilize at 15 PSI for 2.5–3 hours. Allow pressure to return to zero naturally and let bags cool fully to room temperature before proceeding.

• Fully colonized grain bags from Step 3
• Cooled substrate bags from Step 4
• Still-air box or flow hood
• 70% isopropyl alcohol

Work inside a still-air box or under a flow hood. Before opening the grain bag, squeeze and knead it firmly through the bag wall until all grain separates completely into individual kernels — no clumps. Wipe down all surfaces with 70% isopropyl alcohol and allow to dry. Open the substrate bag and spread the colonized grain evenly across the top of the substrate — do not pile it in one location. Use gloved hands to mix the grain down into the substrate, distributing it evenly until no isolated pockets of grain remain. Spawn rate guidance for Termitomyces albuminosus is not documented; use approximately 15–20% spawn to substrate by weight as general mushroom practice. Fold and seal the substrate bag. Move bags to the colonization space at 72–79°F and 55–65% RH and allow the substrate to fully colonize.

• Fully colonized substrate bags
• Turfy soil or potting soil, pH 5.5–7.0
• Clean tray or fruiting container, minimum 6 inches deep
• Fruiting space capable of 68–86°F with 14–18°F day-night swing
• Humidity source to reach and hold 90% RH
• Scattered light source, approximately 300 lux
• Spray bottle for watering

Remove the colonized substrate from the bag — it should hold its shape as a firm, myceliated block, referred to in the patent literature as a "fungus stick." Place the block in a clean fruiting tray or container. Cover the top and sides of the block tightly with turfy or potting soil at a depth of 1–1.5 inches (the documented range is 0.8–1.6 inches converted from the 2–1⅝ inch patent specification). The casing soil must have a pH of 5.5–7.0 — test with a soil pH meter before use. Water the casing layer thoroughly until it is evenly moist throughout, then allow any excess surface water to drain before moving to the fruiting room.

Set the fruiting room to maintain a daytime temperature of 77–80°F at substrate level and a nighttime drop to 63–66°F — providing the 14–18°F day-night fluctuation documented in the cultivation patent as the fruiting trigger. Hold air humidity at approximately 90% RH. Provide scattered, indirect light at around 300 lux for 8–12 hours per day; direct sunlight is not required or desirable. Ventilate the space daily by fanning to exchange fresh air (FAE — fresh air exchange) while maintaining humidity. Mist the casing soil surface when the top quarter-inch feels dry, but avoid pooling water on or around the block.

• Clean scissors or harvest knife
• Container for harvested mushrooms

No species-specific harvest timing indicator (such as a veil break or specific cap diameter) is documented in the literature for artificially cultivated Termitomyces albuminosus. The best available guidance, drawn from general field observations of Termitomyces species, is to harvest while the cap remains closed or is just beginning to open flat and before heavy spore drop occurs. Cut mushrooms at the base with clean scissors or a harvest knife rather than pulling, to avoid disturbing the casing layer and surrounding primordia. Remove any remaining stumps cleanly from the casing surface. Gently re-mist the casing and continue fruiting room conditions for any remaining pins to develop.

Flush count, typical yield per flush, and biological efficiency (biological efficiency = weight of fresh mushrooms ÷ dry weight of mushroom substrate × 100%) are not documented for artificial Termitomyces albuminosus cultivation. Treat each flush as experimental data and record your results — there are currently no grow-logs from home cultivators in the accessible literature to compare against.