How to grow
Using your Harmonix grow kit
Growing mushrooms at home is easier than you think — especially with a kit that already lives on your kitchen counter. In about two weeks (for oyster and lion’s mane), you can have a first harvest.
Your box has a living block, a spray bottle, and a printed insert. You are not starting from spores. We’ve put these steps together to walk you through every part of the process.
Set up tips & tricks
Get your kit ready
When the box arrives, do this first:
1. Open the box the same day. Inside: one living block, a spray bottle, and the printed insert.
2. Look at the bag. It should be white, full, and clean — not green, not sour, not slimy.
3. If the block broke in transit, gently press it back together. Let it sit 2–3 days before you open the bag so the white growth can recover.
4. Read the name printed on the bag. Every sealed bag looks about the same, so the name tells you which steps to follow.
5. Plan to start within 7–10 days. If you’ll be away, keep the unopened bag in the refrigerator for a short hold (not the freezer).
6. Then go to the steps for your mushroom below.
Meet the mycelium
That fuzzy white stuff growing in the bag isn’t mold. That’s the living part of the mushroom, called mycelium. What it looks like can vary: golden oyster is thick and white, lion’s mane is light and wispy, and dark oysters can show a little extra color. Green, black, or a sour smell is the problem — photograph the whole block and email Team@harmonixhome.com within 30 days.
Read the name on the bag first
Every Harmonix block arrives in a sealed plastic bag that looks about the same. You cannot tell the mushroom by looking at the white bag. Read the name printed on your bag, then follow the steps for that mushroom.
X-cut and spray: golden oyster, blue oyster, Italian oyster, Winter White, Trail of Tears, tiger sawgill, L. levis, and lion’s mane (smaller cut).
Open the top and spray: black pearl, king trumpet, pioppino.
Their own method: shiitake, reishi, turkey tail, and chaga — see those names below.
Start your kit (oysters, sawgills, lion’s mane)
1
Find a spot
Kitchen counter, out of hot sun and away from a blasting fan. Near a sink is easy. Keep it out of the cupboard or closet — mushrooms like a little light, fresh air, and a place you’ll see them.
2
Cut an X
Leave the bag on. Cut a 2–3 inch X on the front of the plastic with a clean knife. Lion’s mane does better with a smaller cut or one 3-inch slit. This is the method for golden, blue, Italian, Winter White, Trail of Tears, tiger sawgill, and L. levis.
3
Fill the spray bottle
Tap water. Mist the cut until it looks damp, not dripping. At least twice a day — more if your house is dry.
4
Watch for pins
Once you start the kit, you should see tiny baby mushrooms (pins) in about 6–10 days. From there it often takes another 4–5 days to pick. Don’t let them dry out.
5
Harvest
Oysters: twist the whole cluster when caps flatten but rims still curve in a little. Lion’s mane: pick while still bright white, spines about ¼–½ inch. Cook kitchen mushrooms all the way through. Don’t eat them raw.
Growing tips & tricks
Humidity check
If you live in a dry house, cover the kit with a humidity tent. Take a grocery bag or other loose bag and cut lots of ½-inch holes — mushrooms need fresh air to form correctly. Drape it over the block and mist the inside of the bag every day. When you start to see baby mushrooms (pinning), you can take the bag off and keep misting the block.
Environment
Once you’ve started the kit, focus on three things: water, fresh air, and a little light. Mushrooms need a damp space, some oxygen, and natural light to grow well. Stringy mushrooms want more air. Dry mushrooms need more misting. Pale mushrooms often need more light, or they’re a bit past their peak.
Moisture
Spray regularly, and add a humidity tent if the block looks dry. Keep it on the counter or table — not in a closed cabinet. That way it gets a little light, gentle air, and you’ll notice pins as soon as they show.
From pin to harvest
Pins are tiny baby mushrooms. Once you see them, keep misting. They grow fast. Oysters: pick the whole cluster when caps flatten but the rims still curve in. Lion’s mane: pick while the pom-pom is still bright white. A day early is better than yellow and dry.
Getting more than one harvest
After the first harvest
Keep spraying the same cut. You don’t need to take the block out of the bag or cut a second X. If it looks a bit dry, use a humidity tent. The next round can take a little longer. In around 2–3 weeks you should start to see pins again.
Kit reboot
If there’s no progress, you can soak the block. The first harvest may have dried it out. Take it out of the box and set the cut face down in a bowl of water. Most kinds only need about 20 minutes. Lion’s mane: 5–10 minutes only, and watch it — that white growth is fine and the block can fall apart if it soaks too long.
After the soak
Let it drain cut-side down for another 10 minutes, or tip it so extra water runs off. You don’t want standing water in the bag. Pat the block dry. Put it back with the cut facing out, or skip the box and leave the cut side up. Keep spraying 2–3 times a day.
If your bag says a different mushroom
Shiitake
Shiitake starts with a cold night — that drop in temperature tells it to make mushrooms. When the box arrives, open it and check the bag: white, full, and clean. Read the name. If it says Shiitake, do this:
1. Leave the bag sealed until you are ready to start, within 7–10 days.
2. Take the whole block out of the bag. Set the empty bag aside.
3. Put the block in the refrigerator overnight (not the freezer).
4. Next day, set it on a plate on the counter, out of hot sun.
5. Fill the spray bottle with tap water. Mist the whole block twice a day so it stays damp, not soaking.
6. Brown caps should form in about 10–21 days. Pick them when the rims still curve in a little.
7. Cook fully. Roast or simmer. You can dry extras for soup later.
Reishi
Reishi is a tea mushroom. It grows slowly and stays woody, so you brew it instead of frying it. When the box arrives, open it and check the bag: white, full, and clean. Read the name. If it says Reishi, do this:
1. Leave the bag sealed. Don’t cut it open and don’t spray a sealed bag.
2. Set it in a warm room (about 70–80°F), out of hot sun. A counter or shelf is fine.
3. Wait. Antler shapes often grow inside the bag over 4–12 weeks. This is normal. It will not be ready in a few days.
4. When the cream growing edge stops, take it out. Slice it thin. Dry the slices until they snap.
5. Simmer 1–2 tablespoons in 3–4 cups of water for 45–90 minutes. Strain. Drink as tea. Don’t eat the slices.
Turkey tail
Turkey tail grows thin, colorful fans. You dry them and make tea — they are not a skillet mushroom. When the box arrives, open it and check the bag: white, full, and clean. Read the name. If it says Turkey Tail, do this:
1. Leave the bag on the block.
2. Set it on the counter, out of hot sun, with a little fresh air.
3. Cut a small opening on the front. Fill the spray bottle with tap water. Mist the opening twice a day so it stays damp, not dripping.
4. Fans often take 3–6 weeks. Keep spraying. Don’t rush it.
5. Pick the fans while they still bend and the colors are bright. Dry them until they are brittle.
6. Simmer 1 tablespoon in 3 cups of water for 45–60 minutes. Strain. Don’t fry. Don’t eat the fans.
Chaga
Chaga does not make a typical mushroom cap. You are growing dark, corky tissue for tea, and it takes months. When the box arrives, open it and check the bag: white, full, and clean. Read the name. If it says Chaga, do this:
1. Leave the bag mostly closed. Don’t force it open to “start” it like a fast kit.
2. Set it in a cool room (about 55–70°F), out of hot sun.
3. Wait. Check it now and then. Rust-colored, corky chunks form slowly. This will not look like a grocery mushroom.
4. The 30-day grow promise means the block arrived alive and clean — not that you’ll have a finished harvest on day 12.
5. When firm rust-orange tissue has formed, harvest those pieces and dry them.
6. Simmer 1 tablespoon in 3 cups of water for 30–60 minutes. Strain. Don’t eat the chunks. Pair this kit with a faster cooking block if you want something to eat while you wait.
King trumpet and Black Pearl
These are thick-stem cooking mushrooms. Cooler rooms make better stems. When the box arrives, open it and check the bag: white, full, and clean. Read the name. If it says King Trumpet or Black Pearl, do this:
1. Set it in a cool room (about 50–65°F).
2. Fold the bag down so the top of the block is open. Don’t cut an X on the side.
3. Fill the spray bottle with tap water. Mist the surface twice a day so it stays damp, not dripping.
4. Thick stems in about 10–20 days. Twist them off. The stem is the prize.
5. Slice into coins, sear both sides, cook fully. Don’t eat raw.
Pioppino
Pioppino grows in tight clusters with small brown caps. When the box arrives, open it and check the bag: white, full, and clean. Read the name. If it says Pioppino, do this:
1. Set it on the counter, about 60–70°F, out of hot sun.
2. Fold the bag down so the top is open.
3. Fill the spray bottle with tap water. Mist the surface twice a day.
4. Clusters in about 10–18 days. Twist the whole cluster at the base.
5. Sauté the cluster. Cook fully. Don’t eat raw.
In the kitchen
Cooking and tea
Cook oyster (including blue, Italian, Winter White, Trail of Tears), tiger sawgill, L. levis, pioppino, lion’s mane, shiitake, black pearl, and king trumpet all the way through. Don’t eat them raw. A hot pan, butter or oil, and salt is enough.
Reishi, turkey tail, and chaga are teas. Simmer, strain, and don’t fry. Don’t eat the woody pieces.
If this is your first time eating this mushroom, start with a small amount.