How to Grow Australian Shiitake (Lentinula lateritia)

What You Need

• 1 lb dry rye, wheat, corn, or oat grain
• Water for soaking and simmering
• Autoclavable filter patch bag (0.2–0.5 micron)
• Pressure cooker (16-qt minimum)

What to Do

Rinse grain thoroughly, then soak in cold water for 12 hours. Drain, transfer to a pot, cover with fresh water, and bring to a simmer. Cook for 15–20 minutes until grain is fully hydrated but not split. Drain and spread on a clean surface or towel until kernels are dry to the touch on the outside — moist inside but no surface moisture. Load grain into filter patch bags, leaving room for expansion. Seal bags by folding the top and securing with a heat seal or zip tie. Pressure cook at 15 PSI for 90–120 minutes, then allow to cool completely to room temperature before handling.

Out-Grow also carries sterilized grain bags ready to inoculate if you want to skip this step: Sterilized Grain Spawn Mushroom Bags.

What You Need

• Australian Shiitake liquid culture syringe
• Cooled, sterilized grain bag(s) from Step 1
• 70% isopropyl alcohol and flame source
• Still-air box or laminar flow hood

What to Do

Shake the liquid culture syringe vigorously for 30 seconds to evenly distribute mycelium fragments. Inside your still-air box or flow hood, flame the needle until red-hot and allow it to cool for 10 seconds. Inject 3–5 cc of liquid culture into each 1 lb grain bag through the injection port or self-healing port. Redistribute liquid across the grain surface immediately by shaking the bag gently. Store inoculated bags in a dark location at 72–79°F.

Out-Grow sells Australian Shiitake (Lentinula lateritia) liquid culture ready to inject: Australian Shiitake Liquid Culture.

What You Need — Per 5 lb Block

• 4 lbs hardwood sawdust pellets (HWFP) or fine hardwood sawdust
• ¾ lb wheat bran
• ⅛ lb gypsum (optional)
• Approximately 5½ cups water
• Large autoclavable filter patch bag (0.2–0.5 micron)

What to Do

Combine dry HWFP, wheat bran, and gypsum in a large mixing bowl or bucket. If using wood pellets, add water gradually while mixing — pellets will break down into fine sawdust. Continue adding water until the mixture reaches field capacity (squeeze test: a firmly pressed handful should release only 1–2 drops of water; if water streams freely, the mix is too wet). Load the hydrated substrate into filter patch bags. Seal and pressure cook at 15 PSI for 2.5 hours minimum. Allow to cool completely before opening.

Out-Grow also carries ready-to-use hardwood substrate bags: Wood Based Inoculate and Wait Mushroom Substrate.

What to Do

Inside your still-air box or flow hood, break up the colonized grain completely inside its sealed bag — squeeze and knead until all kernels separate. Open the grain bag and the sterilized substrate bag. Distribute colonized grain evenly across the substrate surface before mixing in. Mix thoroughly until no isolated clumps of grain remain. The spawn rate should be 10–20% by weight of wet substrate. Reseal the substrate bag and return it to your incubation space at 72–79°F.

What You Need

• Inoculated substrate bag from Step 3
• Dark location holding 72–79°F
• Thermometer

What to Do

Store sealed bags undisturbed at 72–79°F in a dark location. Keep bags sealed and do not open during colonization or browning — this is critical for Lentinula lateritia. The block progresses through three phases: Phase 1 (white colonization, 8–12 weeks), Phase 2 (popcorning — small knots and bumps form across the surface), and Phase 3 (browning — the surface progressively darkens to a reddish-brown as the mycelium matures and a protective coat hardens). Do not attempt to initiate fruiting until the block surface is at least 70–75% reddish-brown. The entire colonization and maturation timeline runs 14–24 weeks from inoculation.

The browning phase is not contamination — it is the required maturation response of all Lentinula species before they are capable of producing fruit bodies. A block that turns brown is doing exactly what it should.

What You Need

• Fully matured, browned Australian Shiitake block
• Refrigerator or cold-water bath (40–55°F)
• Fruiting chamber or grow tent at 59–77°F
• Hygrometer

What to Do

Move the matured block to a refrigerator or submerge it in a cold-water bath at 40–55°F for 12–24 hours. This thermal shock is a required pinning signal for the Lentinula genus — not merely beneficial. After the cold shock, remove the block from its bag and transfer to your fruiting chamber. Maintain fruiting temperature at 59–77°F (optimal 64–72°F) with relative humidity at 85–95%. Provide diffuse light 10–12 hours per day (200–800 lux) and increase fresh air exchange — open vents or fan briefly 2–3 times daily to keep CO₂ below 1,000 ppm.

What You Need

• Fruiting chamber holding 59–77°F, 85–95% RH
• Diffuse light source (200–800 lux)
• Spray bottle for misting
• Hygrometer

What to Do

Mist the walls and floor of the fruiting chamber (not directly onto pin clusters) twice daily to maintain 85–95% relative humidity. Exchange fresh air 2–3 times daily by opening vents or fanning briefly — elevated CO₂ produces long, thin stems and small caps. Keep temperature consistent at 59–77°F; temperature spikes above 77°F sustained during pinning will abort developing pins. Pin clusters develop from the initial pointed bumps into identifiable orange-red to brick-red caps over 7–14 days.

What You Need

• Clean hands
• Sharp knife or clean scissors (for dense clusters)

What to Do

Harvest when caps have opened 50–75% and the partial veil has just broken — gills visible, cap edge still slightly curled downward. For Lentinula lateritia specifically: a uniformly brick-red cap with white gills visible and the veil recently detached is the target. For individual mushrooms, grasp the lower stipe firmly, twist 90–180°, and pull with gentle upward force to remove the entire base cleanly — this leaves no stump behind to attract contamination. For dense clusters, cut cleanly at the block surface with scissors or a sharp knife. Handle only the stipes — finger contact with the cap surface causes rapid discoloration. Harvest the entire cluster in a single session; do not leave over-mature mushrooms on the block.

What You Need

• Spent Australian Shiitake block after first harvest
• Cold water (40–60°F) for soaking
• Container large enough to submerge the block

What to Do

After harvest, allow the block to rest in fruiting conditions for 7–14 days. When the block has lightened noticeably in weight, submerge it in cold water (40–60°F) and hold it underwater with a weight for 6–8 hours — do not exceed 12 hours, as prolonged soaking risks bacterial infiltration. This cold soak also functions as a secondary cold shock trigger. Remove the block from the water, allow excess water to drain for 30 minutes, then return to the fruiting chamber and resume the fruiting environment from Step 6. First flush is typically the largest; yield decreases approximately 30–40% per subsequent flush. Expect 2–3 flushes per block before the substrate is spent.

Identify a spent block by persistent lightness after soaking, pale gray or yellowish mycelium, structural breakdown, or returning contamination that cannot be cleared.

What You Need

• Fresh hardwood logs: oak (red, white, or pin), sugar maple, eucalyptus, beech, or alder
• Logs 4–6 inches in diameter, 36–48 inches long
• Logs inoculated within 1–3 weeks of felling (winter-felled logs: up to 6–8 weeks)

What to Do

Select logs from healthy trees with intact bark — cracked or peeling bark reduces moisture retention and exposes inoculation holes to competing organisms. Oak and sugar maple deliver the highest natural sugar content and best productivity in the US. Eucalyptus is species-authentic to Lentinula lateritia and is available in US Pacific Coast states. Avoid conifer logs (pine, cedar, spruce) — resin and terpene content can prevent colonization entirely. Do not use logs more than 3 months post-felling — competing wood-decay fungi occupy the sapwood and outcompete shiitake spawn. Store logs in a shaded location off the ground until ready to inoculate.

What You Need

• Plug spawn (Lentinula lateritia)
• Drill with 5/16″ or 7/16″ bit
• Mallet
• Food-grade wax and brush or wax applicator

What to Do

Drill holes approximately 1 inch deep in a diamond pattern across the log surface — holes spaced 4–6 inches apart along the length of the log, with rows 2–4 inches apart. Seat a plug spawn dowel into each hole and tap flush with the mallet. Apply wax immediately to each plug hole and to both cut ends of the log — wax seals moisture in and competing organisms out. Allow wax to set completely before moving logs to their outdoor site.

What You Need

• Inoculated logs from Step 2
• Shaded site: 70–100% shade, good airflow, well-drained ground
• Log supports to keep logs off the ground

What to Do

Prop inoculated logs off the ground on supports or lean them against a rack in a shaded, ventilated location. Direct sunlight dries logs rapidly and kills developing mycelium. Keep logs at greater than 35% moisture content — in dry climates or during drought, water logs occasionally. Allow logs to colonize undisturbed for 6–18 months depending on log diameter and ambient temperature. Lentinula lateritia colonizes through the full log diameter; white mycelium visible at the cut ends confirms successful colonization.

What You Need

• Fully colonized Australian Shiitake log
• Container large enough to submerge the log
• Cold water
• Weight to keep log submerged

What to Do

Submerge the colonized log fully in cold water and hold it underwater with a weight for 12–24 hours. Strike the log sharply against the ground 2–3 times before soaking — this physical shock combined with the cold water soak triggers fruiting initiation. Remove the log from the water and return it to its shaded site. Natural fruiting occurs in autumn and spring after rainfall events; for the rest of the season, the forced soak-and-strike method replicates those conditions. Lentinula lateritia's heat tolerance makes warm-season forced fruiting more viable for this species than for standard shiitake strains. Allow 6–8 weeks between forced fruiting events to avoid exhausting the log prematurely.

What You Need

• Fruiting Australian Shiitake log
• Clean hands

What to Do

See Step 7 of the Indoor Sawdust Block method for harvest timing and visual cues — the brick-red cap at 50–75% open with veil just broken applies identically to log-grown Australian Shiitake (Lentinula lateritia). For log method harvesting specifically: grasp the lower stipe and pull sideways across the grain of the log bark rather than straight up — this minimizes bark damage and peeling. Do not harvest immature specimens; they will not pull cleanly and substrate damage to the log results. Production life for Australian Shiitake (Lentinula lateritia) logs is 3–5 years.