How to Grow Gold Enoki Mushrooms (Flammulina velutipes)

Rinse the rye berries under cold water, then soak them in a large pot of cold water for 12–18 hours. After soaking, drain and add fresh water, then bring to a simmer and cook for 15–20 minutes until the kernels are fully hydrated but still intact — they should feel firm with no chalky core. Drain the cooked grain in a colander and spread on a clean towel to surface-dry for 30–60 minutes until kernels feel dry to the touch on the outside with no visible surface moisture.

Load the dry-surface grain into filter patch grow bags, filling each no more than two-thirds full to allow for shaking. Fold the bag top over twice, secure with a binder clip, and pressure-cook at 15 psi for 90–120 minutes. Allow the bags to cool completely at room temperature — this takes 6–12 hours. Grain that is still warm will kill the liquid culture. Out-Grow also carries sterilized grain spawn mushroom substrate bags ready to inoculate if you want to skip this step.

Once cool, wipe the injection port area with 70% isopropyl alcohol, flame the syringe needle until glowing, let it cool for 5 seconds, then inject 3–5 cc of Gold Enoki liquid culture per 1 lb grain bag. Shake the bag immediately after inoculation to distribute the culture, then set aside at 70–77°F out of direct light.

Combine the hardwood sawdust, wheat bran, calcium carbonate, and sucrose in a large mixing bowl and stir dry until evenly blended. Add water gradually while mixing — the target is about 60% moisture content. Test by squeezing a handful firmly: the substrate should clump together and release only 1–2 drops of water at most. If it flows freely, it is too wet. If it crumbles apart, add water in small amounts and test again.

Load the mixed substrate into a large filter patch grow bag and fold the top over twice, securing with a binder clip or heat seal. Pressure-cook at 15 psi for 90–120 minutes. Move the bags carefully — hot substrate shifts and can unbalance the cooker. Allow to cool completely before proceeding: 8–12 hours is typical for large bags. Out-Grow also carries wood-based inoculate and wait mushroom substrates ready to use if you want to skip this step.

Work in a still air box or in front of a laminar flow hood. Wipe all exterior bag surfaces with 70% isopropyl alcohol. Before opening the grain bag, squeeze and knead it firmly through the plastic until all clumped grain breaks apart into individual kernels — the bag should feel loose and free-flowing when squeezed.

Open both bags quickly and pour the colonized grain evenly across the surface of the substrate — spread it in an even layer before mixing in to avoid pockets of grain concentrating in one area. Mix thoroughly by working your hands along the outside of the bag until no isolated clumps of grain remain separate from the substrate. Fold the bag top down and seal it. Do not allow the bag to remain open longer than necessary.

Place inoculated bags in a dark location holding 70–77°F. No light is needed during the spawn run (mycelial growth phase). Do not open the bags, mist, or introduce fresh air during this phase — the sealed environment maintains moisture and the high CO₂ that gold enoki mushrooms (Flammulina velutipes) prefer during mycelial growth. Keep bags off cold concrete if room temperature drops; set them on a wooden shelf or cardboard instead.

Check bags daily for any green, black, or yellow patches, which indicate contamination. Healthy gold enoki mycelium is bright white and dense, eventually forming a thick, leathery surface mat across the full top of the block. Avoid temperatures above 79°F consistently — this slows growth and favors competing molds.

Once fully colonized, move the block to its fruiting environment. Open the top of the grow bag or cut a 3–4 inch opening across the top to allow fresh air exchange (FAE). For Out-Grow's Gold Enoki (Flammulina velutipes), which is a golden-type strain, the target fruiting temperature is 50–60°F. Classic white enoki strains require a deeper drop to 40–50°F.

Maintain relative humidity at 90–95%. Mist the walls of the humidity tent twice daily — do not mist the block surface directly. Keep CO₂ in the 2,000–4,000 ppm range during fruiting by limiting fresh air exchange. High CO₂ combined with low light (100–200 lux) is what produces long, slender gold enoki mushroom stems. If stems are short and caps are opening wide, CO₂ is too low or light is too bright — reduce FAE and dim or move the light source farther away.

Harvest gold enoki mushrooms (Flammulina velutipes) when the clusters are dense, stems are 3–5 inches long, and caps remain small and tight — before caps begin to flatten, darken, or flare at the edges. This is typically 3–5 days after pins appear at 50–60°F. Cut the entire cluster at the base flush with the substrate surface using a clean knife. Do not pull or twist clusters out of the block, as this disrupts the mycelial network and reduces second-flush yields.

Sanitize the knife with 70% isopropyl alcohol between clusters. Remove any stem stubs or loose debris from the block surface after harvest. Store harvested gold enoki mushrooms (Flammulina velutipes) immediately at 34–36°F — refrigerate them as quickly as possible after cutting.

After harvest, mist the block surface lightly and return the bag to the colonization environment at 70–75°F. Do not submerge or dunk enoki blocks — full submersion is not standard practice for gold enoki mushrooms (Flammulina velutipes) and introduces bacterial contamination risk. Keep CO₂ slightly elevated and the block sealed or loosely folded over at the top during this rest phase. Allow the mycelium to recover for 5–10 days.

After the rest period, re-open the bag top and return the block to fruiting conditions — drop temperature back to 50–60°F, maintain 90–95% RH, and hold CO₂ in the 2,000–4,000 ppm range. Second flush typically follows within 5–10 days of returning to fruiting conditions. Discard the block if no new pins appear after 14 days in fruiting conditions, or if contamination patches develop on the substrate surface.

Mix hardwood sawdust, wheat bran, calcium carbonate, and sucrose dry until evenly blended. Add water gradually to reach about 60% moisture — squeeze a handful firmly and it should release 1–2 drops only. Fill each bottle or jar to about two-thirds full, tamp lightly, and wipe the rim clean. Cap the bottles with polyfill-stuffed lids or foil — do not use airtight lids during sterilization.

Pressure-cook the filled bottles at 15 psi for 90–120 minutes. Allow to cool completely — 6–8 hours for 1-liter bottles. Once fully cooled, wipe the cap area with 70% isopropyl alcohol, flame the needle, and inject 2–3 cc of Gold Enoki liquid culture per bottle. Seal with the cap and set upright at 70–77°F in low light.

Remove the caps from fully colonized bottles and replace with a collar of loose aluminum foil or a paper collar that allows minimal air exchange. Move bottles to the fruiting environment. For Out-Grow's gold enoki strain, drop temperature to 50–60°F. Classic commercial enoki strains require a deeper drop to 40–50°F — if pins do not appear after 10 days, drop the temperature further.

Maintain 90–95% RH by misting the walls of the fruiting chamber — never mist the bottle surface directly, as water pooling inside the bottle neck introduces bacterial contamination. Hold CO₂ at 2,000–4,000 ppm with minimal FAE. The gold enoki mushroom morphology — long stems, small caps — depends on this elevated CO₂. Light should be kept at 100–200 lux or lower. Clusters will emerge from the bottle neck and grow upward, with stem length controlled by CO₂ level.

Harvest gold enoki mushrooms (Flammulina velutipes) when stems are 3–5 inches long extending from the bottle neck and caps remain small and tight — before caps flatten or flare. Slice the entire cluster at the base in one clean motion using a sharp, sanitized knife. Do not pull clusters from the bottle, as this risks dislodging colonized substrate from the bottle walls and breaking the mycelial network needed for subsequent flushes.

After harvest, lightly mist the bottle surface and return to the colonization environment at 70–75°F with the foil collar loosely replaced. Allow 5–10 days of rest before returning to fruiting conditions. The bottle is spent when it produces no new pins after a full fruiting cycle, shows visible substrate pulling away from the bottle walls, or develops contamination.