The all-in-one bag

The rye colonises before you mix it into the beech, and a shiitake is not cut the day the block turns white.

Two foods in the same volume

An all-in-one bag is not a kit that fruits because the plastic is closed. It is two sterile substrates that share a filter and a port: rye, which is the bridge, and beech, which is the wood on which wood-rotting fungi can make fruit bodies. The advantage, compared with a jar of grain and a bag of sawdust opened on the table, is that the passage from one to the other can happen without letting the kitchen in. The risk is treating the two foods as if they were the same food. They are not. Rye is rich, fast, easy to read. Beech is poorer in simple sugars, slower, and it has to be taken by a mycelium that is already numerous. Injecting a few millilitres of liquid culture straight into it, scattered at random in the sawdust, is a long bet: a single point in a large volume, a mycelium that is still dilute, and a lot of sterile wood waiting for whoever arrives first.

The order is this. You inoculate the rye. You wait until the rye is colonised. You mix that rye into the beech from the outside, without opening. You wait until the beech is colonised and consolidated. Only then do you think about a cut. For an oyster, the cut can come when the block is white and holding together. For a shiitake, white is halfway: browning is still required. Mixing the two species up is how a correct bag becomes a block cut too soon.

The rye and beech bag holds one kilo of rye and one or two kilos of beech, with the port. The port goes into the grain. It is not an invitation to stab the sawdust in five places “to be sure”.

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The rye first

Bring the bag to room temperature. Wipe the port with 70% alcohol. Shake the syringe. Inject two or three millilitres into the rye, in different places in the grain, not into the wood and not the whole volume into a single pocket. Ten millilitres is more than one bag: the rest goes back in the fridge, capped, between 2 and 8 °C. Label species and date on the plastic, not on the filter.

Then you do not mix. You do not “help” the beech by pushing a little rye down on day three. At that point the rye is a small front in a sea of seeds that are still bare. If you distribute it through the wood, you dilute a mycelium that has not yet won at home, and you hand the beech — sterile, therefore undefended — a thin inoculum. Any spore that came in with the needle, or any bacterium that was in a droplet, gets the same wood. The rye should be left to turn white in its compartment, or in its zone of the bag, until the seeds are evenly colonised. If at about a third you break only the rye loaf, from the outside, without dragging everything into the beech, you are doing the right break on the bridge, not the jump to the substrate. You wait for the rye to recover the way you would on any grain: a day or two of apparent stall, then new points, if the species is an oyster and the room is around 20–24 °C.

Shiitake on the same rye is not judged by the oyster’s clock. It can take twice as long to cover the seeds, and the white is often less spectacular. As long as it is advancing, stays white or at most amber with metabolites, and the smell is of mushroom, you wait. You do not mix it into the beech out of boredom.

Then the beech, still closed

When the rye is colonised, you mix. From the outside. You break the loaf and let it fall through the wood, you massage the bag until the white seeds are distributed and not all left in a corner at the top. The idea is the same as spawning a substrate: one part of spawn that is already alive through several parts of wood. Here the parts share the plastic, so you do not need to open to make the gesture. If you open, you turn a sterile system into a system that has just met the air of the room, at the moment the beech is not yet colonised. That is the window in which Trichoderma wins. The filter was already exchanging gases. It did not need your opening in order to breathe.

After mixing, the bag looks as if it has taken a step backwards. The wood shows again, the seeds are white specks in the beige. That is normal. You have diluted a continuous front into a new volume. Recovery, here, is colonisation of the beech starting from those seeds. You do not cut in this phase. You do not “take a look” by opening a corner. You keep it between 18 and 24 °C, out of the sun and away from the radiator, filter clear. Oysters often knit the block back together in one to three weeks, if the rye was truly colonised and the wood was not a sodden brick. That is not a deadline. It is an order of magnitude. A block that stays dark in the core is not ready, even if the plastic is white.

Wood that is too wet goes sour in the core even if it was sterile: water takes the place of air, and bacteria, if they get in, or simply the mycelium failing to breathe, follow. Wood that is too dry covers itself with a thin white that does not consolidate. You do not fix it with a syringe of water in the port. Water does not distribute through a block of sawdust. You take the bag you have. If the smell turns sharp, you discard it closed.

An oyster can come out when the block holds

An oyster, when the beech is evenly white and the block has become one body, can fruit. You cut a side slit a few centimetres long, you press out the extra air without crushing the block into a sheet, and you keep the opening humid in indirect light. Misting the pins is how you rot them. You mist the air, or you keep the room humid, and you exchange it. Long stems and small caps mean high carbon dioxide: the bag is still too closed, or the room has no exchange. You do not need a cut that opens half the plastic. An enormous cut dries the block before the fungus has made the cluster.

Blue oyster liquid culture is Pleurotus ostreatus, the same species as pearl oyster, with a different cap colour. It suits this bag because it runs on rye and accepts beech. It is not more “productive” for being blue, and it does not forgive a mix done when the rye was still a third bare. Ten millilitres do not all get poured into the wood. A few in the rye are enough. The rest, if the syringe is clean, inoculates another grain another day.

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A second flush, on a block that has not dried out, is common. A light block can be soaked for a few hours and drained well. If it smells sour after the first flush, the soak does not repair it: it waterlogs it. You stop there.

Shiitake has to brown

Shiitake does one thing more, and the all-in-one bag does not cancel it. After the beech is colonised, the mycelium matures. The surface loses the milk white, turns brown, sometimes knobbly, and forms a crust. In English this is called browning, sometimes popcorning for those bumps. It is not Trichoderma. Green is Trichoderma. Shiitake brown is the fungus making a skin. That skin is part of how the block holds water and then fruits. Cutting on the day the wood turns white interrupts maturation. You get a block that dries from the cut, or that moulds on the wound, or that makes a few weak primordia, and you conclude that “shiitake does not work in the bag”. It works on a different calendar.

Browning can last as long as colonisation, sometimes longer. Weeks, not a weekend. It often happens inside the bag while it is still closed. You do not open it to “see it better”. You watch the colour through the plastic. When the crust is widespread and the block is firm, then you can take the plastic off or open a window, sometimes after a cooler rest, and raise the humidity with air exchange. Exact times depend on the strain and the room. Anyone who writes you a single date is describing their room, not yours.

Donko shiitake liquid culture is inoculated into the rye with the same gesture as the oyster and with none of its deadlines. Donko is a form of Lentinula edodes, not a dark oyster. If you put the two syringes into the same bag you do not get a hybrid. You get a race, and usually an unreadable mess. One needle, one bag, one label.

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Do not compare the Donko bag on day ten with the blue oyster bag on day ten. Compare it with itself: the rye advances, then the beech knits, then brown replaces white. If at the second step the white does not take the wood, the rye was not ready or the wood was too wet or too cold. You do not fix that by opening and “remixing by hand”.

What gets mistaken for failure

A bag that after mixing has white seeds only at the top needs another massage from the outside, not a cut. The seeds have to get through the wood. A bag that is hot to the touch, an oyster, in a room already at 24 °C, is respiring hard: move it away from the heat, do not open it to cool it down. Internal condensation after mixing is normal. A dark puddle and a sharp smell are not.

Green gets discarded closed, bagged, without being photographed lid-open on the kitchen table. Beech is good food for Trichoderma too, especially if someone opened early. That is why patience on the rye is not fussiness. It is how the wood stays yours.

Lion’s mane, if one day you put it on a similar bag, resembles the oyster in the sequence — grain first, then wood, then a small cut — and resembles shiitake in its relative slowness, not in browning. It wants high humidity on the wound and it suffers draughts. Reishi wants still more time, and it decides the shape of the fruit body according to carbon dioxide: antlers in still air, a cap when exchange increases. None of these is cut on wood that is half white. The all-in-one bag does not change the species. It only removes one opening, if you do not give that opening back ahead of time.

What this guide is not

It is not a promise that one bag replaces having understood grain and wood. It is the order: colonised rye, beech mixed from the outside, consolidation, and for shiitake a brown skin before any slit. If you skip a step, the bag does not recover it for you.