Can you grow mushrooms from store-bought mushrooms?

You can grow some mushrooms from store-bought mushrooms, but not by planting them. You clone them: a tiny piece of clean tissue from inside a fresh mushroom grows out on agar, and that culture becomes your grain spawn. Oysters are the easiest, and lion's mane, shiitake and king oyster clone well too. Button, cremini and portobello need a specially made compost, beech runs long factory bottle cycles, and maitake is slow and contaminates easily, so they're hard to grow at home. Enoki clones, but it needs cold and a collar to look like the store pack.

We cloned a store-bought lion's mane in 2025, and the plates pictured above come from that line. Sources were checked on 29 October 2026.

Which store-bought mushrooms can you grow?

You can grow fresh oyster, king oyster, lion's mane and shiitake from a store pack, while button, portobello, beech and maitake are hard at home. Oysters are the best bet: UF/IFAS Extension's oyster-cloning guide recommends buying oysters "from the market" to clone, so you can be sure of an edible species and a strain suited to growing (UF/IFAS). GroCycle names oyster, shiitake and lion's mane among "the easiest mushrooms to grow and clone", and says thick, fleshy mushrooms like king oysters are easiest to cut clean tissue from (GroCycle).

Store-bought mushroom	Can you grow it at home?	Why
Oyster (grey, blue, white)	Yes, the easiest	Clones on agar; the stems also work on cardboard
King oyster	Yes, on agar	Thick stems give clean tissue
Lion's mane	Yes, on agar	We've done it (pictured)
Shiitake	Yes, on agar, but slow	Slower mycelium; better on sawdust than cardboard
Pink oyster	A poor bet from a chilled case	It's cold-sensitive, and grocery packs are usually refrigerated
Button, cremini, portobello, baby bella	Not practically	One species (Agaricus bisporus) that fruits on a specially made compost under a casing layer
Enoki	Yes, with cold	Clones on agar; the long white store form needs cold, dark and a collar
Beech (shimeji)	Hard	Long bottle-grown cycles in commercial farms
Maitake	Hard	Slow to colonize, and contaminates easily

Button, cremini and portobello are the same species, Agaricus bisporus, with brown strains sold as cremini and portobello (MushroomExpert.com). Penn State Extension describes its usual compost of straw and horse manure, made in two composting phases, with the mushrooms fruiting under a casing layer (Penn State Extension).

Enoki from a store "looks nothing like the wild mushroom," writes Michael Kuo (MushroomExpert.com). Our enoki grow guide explains the cold, the collars and the dark it needs.

Beech takes about 80 days to incubate in commercial bottles (Korean Society of Mushroom Science). Maitake is one of the hardest gourmet species, as our maitake grow guide explains. Some commercial beech and maitake strains also carry US plant patents (see the legal section).

"Chestnut" is a trap: in stores the name is sometimes used for brown Agaricus, not Pholiota adiposa (GroCycle). If it looks like a cremini, it probably is one.

How do you clone a store-bought mushroom?

Clone a store-bought mushroom by tearing a fresh one open and moving a tiny piece of its inside tissue onto sterile agar, working in a still air box or a flow hood. You'll need sterile agar plates first; our agar guide shows how to make them with a pressure cooker. UF/IFAS gives the method: pull the cap apart to expose "the inside uncontaminated tissues," then move tiny pieces with sterile tweezers to the agar (UF/IFAS). GroCycle's steps fill in the rest (GroCycle):

Pick the freshest young, thick-fleshed mushroom in the pack, and clone it soon: GroCycle keeps a mushroom in the fridge for 48 hours at most, because "it's harder to germinate mycelium from older mushrooms."
Wipe the outside with an alcohol-soaked cloth. The surface is "more than likely covered with contaminants."
Tear it, don't cut it. A knife can push outside contaminants into the clean center, and the inside of a torn mushroom is much cleaner than the outside.
Flame the scalpel until it glows red outside the still air box (never use an open flame inside one), let it cool, and sterilize it again between pieces.
Take a 3 mm (⅛ in) piece from the middle of the stem or just below the cap, set it on the agar and close the dish right away. Skip the gills: they're hard to clean and carry spores that can give you a different strain.
Seal and label each plate with the species and the date.

Mycelium should start growing out from the tissue within 2 to 3 days, says GroCycle. A plate from a tissue clone can take 1 to 3 weeks to grow out, according to a lab guide hosted by USDA SARE (SARE). When clean white growth spreads from the tissue, cut a wedge from its leading edge onto a fresh plate, then move a clean plate to grain. UF/IFAS incubates oyster grain spawn at 23°C (73°F) in the dark until it is fully colonized, around 10 to 20 days (UF/IFAS). Our stages guide shows what comes next.

What is the stem butt method?

The stem butt method grows oyster mycelium from the base of store-bought oyster stems on cardboard, with no agar. GroCycle pours boiling water over torn cardboard, lets it cool and drains it, layers it in a container with fresh stem butts, keeps it at 20–24°C (68–75°F), and expects it to be colonized in about 11 days (GroCycle). Grocery oysters work "if they're fresh enough," because the cut stem is still alive. That colonized cardboard is then mixed into a bulk substrate as spawn, at about 15% by volume.

GroCycle says the stem butt method is "less reliable" with "lower yields," and only knows it to work on oysters. Throw out any batch with green or black spots.

Why do store-bought clones fail?

Store-bought clones fail mostly from contamination and age: the mushroom has sat in a cold case, its surface carries mold and bacteria, and you can't know how many times its strain was copied before it reached you. The common causes:

Age. The longer a mushroom is stored, the harder its tissue is to grow and the higher the risk of contamination, says GroCycle. A pack that's been on the shelf for days is already behind.
Cold. Pink oyster dislikes cold. North Spore's help center says "Pink oyster mushrooms don't tolerate temperatures below 40 degrees F" and that its cultures can't be refrigerated (North Spore). That's about kits and cultures, not fresh mushrooms, but a pink oyster from a chilled case is a risky pick.
Contamination. The SARE-hosted lab guide warns that mushroom tissue on agar carries "a higher risk of contamination." The first plate is often dirty. GroCycle's fix for spots of black or green mold is to cut a clean piece of mycelium away onto a new plate.
A worn-out line. "If you continuously clone clones, the mycelium eventually weakens," says GroCycle. In a study of straw mushrooms (Volvariella volvacea), signs of strain degeneration were clear after 12 rounds of tissue isolation, and after 19 it no longer fruited (Frontiers in Microbiology, via PMC). Those numbers are for one species, but a 2020 study of oyster mushrooms also notes that "successive subcultures usually lead to strain degeneration" (Molecules, via PMC).

Even a professional lab takes time: Fungi Perfecti quotes a typical turnaround of four months, counted from when it receives the specimen, for its cloning service (Fungi Perfecti). If you want a surer first harvest, a vendor culture or a beginner kit is more reliable.

How do you tell if a clone plate is contaminated?

A clean clone plate shows white mycelium growing out from the tissue and nothing else growing on the agar; green or black spots, or any other growth that isn't your mycelium, are signs of contamination. UF/IFAS says to keep a culture only once new growth comes out of the tissue "without any contamination," and to discard contaminated plates (UF/IFAS). Our contamination identification guide shows what mold and bacteria look like, and what normal looks like.

Is it legal to clone store-bought mushrooms?

Cloning a store-bought mushroom to grow for your own kitchen is the lowest-risk case, but some commercial mushroom strains are patented or protected, and selling copies is where owners have sued. This isn't legal advice.

Some strains are protected. A 2026 Wageningen University paper counts 15 US plant patents for edible mushroom strains and at least 45 protected varieties of oyster mushroom. It notes that infringement "is not uncommon," because "it is very easy to make copies of varieties through tissue cultures" (Wageningen University & Research). Hokuto, a Japanese grower, holds US plant patents on beech and maitake strains (beech patent and maitake patent, via Google Patents).
US plant patents cover cloning. The owner can stop others from "asexually reproducing the plant" (35 U.S.C. § 163, via Cornell LII), and tissue cloning is asexual reproduction. The statute names no home-use exception.
Plant breeder's rights, which protect some mushroom varieties in the EU and UK (Wageningen University & Research), follow the UPOV Convention, whose breeder's right doesn't extend to "acts done privately and for non-commercial purposes" (UPOV).
Owners have sued sellers. In 2020 the spawn maker Amycel sued two other spawn companies in a Dutch court, alleging that a strain they sold copied a brown mushroom strain Amycel had patented (Mushroom Business).

Selling or giving away spawn, cultures or mushrooms from a store clone is where that risk sits, since UPOV's private-use exception covers neither. If you plan to sell what you grow, buying vendor spawn also gives you the spawn receipts some markets ask for, as our guide to selling mushrooms explains.

How do you track a clone in Hypha?

In Hypha, our grow tracking app, add a clone as a new strain whose Strain Origin Abbreviation starts with C: Hypha's own hint is "C for clone," with C1 for your first clone. That's how our lion's mane line got its LM-C1 code. Then create a block, choose New, pick the strain, and set the stage to Culture and the container to Agar Plate.

When a plate is ready to move on, tap Mark Ready on its timeline, then Transfer. Hypha opens a new block with the parent already filled in; pick a plate, jar or bag and save, and the child's code carries its parent's. View Lineage in the phone app shows the whole family tree. When a line slows down, you'll see how many transfers it's had, and our grow log guide covers when to retire it. Clones, transfers and lineage are on the free plan, which holds 25 active blocks; every plate, jar and bag counts until you archive it. Download Hypha.

FAQ

Can you clone a dried mushroom?

Use fresh mushrooms. GroCycle says to clone as soon as you can, because "it's harder to germinate mycelium from older mushrooms," and we found no reliable guide to cloning dried mushrooms.

How many times can you clone a clone?

Not forever. GroCycle says repeated cloning eventually weakens the mycelium. Keep a clean plate of your first clone in the fridge as a mother culture, and start new work from it, not from your newest plate. Pink oyster is the exception: keep its plates at room temperature.