How Long Does It Take to Grow Mushrooms? (Honest Timeline by Species)
How Long Does It Take to Grow Mushrooms?
Quick answer: From a colonized fruiting block to first harvest, mushroom growing time runs 7 to 14 days for fast species like pearl oyster (Pleurotus ostreatus) and blue oyster (P. columbinus), 14 to 21 days for medium species like pink oyster (P. djamor) and pioppino (Cyclocybe aegerita), and 21 to 35 days for slow species like lion's mane (Hericium erinaceus) and shiitake (Lentinula edodes). That window assumes a US household at 65 to 75°F with steady humidity and fresh-air exchange. Starting from spore instead of a pre-colonized block? Add 14 to 30 days of incubation.
Below: the four-stage breakdown, a seven-species comparison table, and a day-by-day walkthrough. Honest numbers from people who grow these every week.
The Four Stages and What They Actually Mean
Every mushroom grow moves through the same four biological stages, no matter the species. The species changes how long each stage takes, but the sequence is fixed.
Stage 1: Inoculation
Inoculation is the moment grain spawn is introduced to sterile substrate. For most home growers, this happens at the lab, not your kitchen counter. The block you receive is already inoculated and partially colonized. Growing from scratch requires a sterile work area, a flow hood or still air box, and 1 to 2 hours of bench time.
Stage 2: Colonization (Incubation Time)
Colonization is when mycelium, the white thread-like body of the fungus, spreads through the substrate. The block goes from speckled white to fully white. Mushroom incubation time runs 10 to 21 days at 70 to 75°F. Oysters colonize fastest, shiitake takes the longest. You do nothing except keep the block warm and out of direct light.
Stage 3: Pinning (Primordia Formation)
The mushroom pinning stage is when the colony decides to fruit. Pinhead-sized bumps called primordia appear on the surface. This is triggered by a sudden shift: a drop in CO2, humidity to 90 to 95%, a temperature drop of 5 to 10°F, and exposure to indirect light. A Lykyn chamber handles the transition automatically. A manual setup requires cutting the block open, misting twice daily, and fanning for fresh-air exchange. Pinning takes 2 to 5 days for fast species, 5 to 10 days for slow species.
Stage 4: Fruit Body Maturation
Once pins form, mushrooms grow visibly day by day. Oysters can double in size overnight in peak fruiting. Lion's mane spines lengthen by a couple of millimeters per day. Shiitake caps thicken slowly over a week. Maturation runs 3 to 7 days for oysters, 5 to 10 days for lion's mane and shiitake. Harvest when oyster caps are still curled at the edges, lion's mane spines are 1/4 inch but not browning, or shiitake caps have flattened but not released spores.
Total mushroom growing time = colonization + pinning + maturation.
Seven Species, Seven Timelines
This table is the canonical answer to "how long does it take to grow [species]". Times assume a pre-colonized fruiting block at 65 to 75°F ambient temperature with steady humidity. If you're working from spawn-to-substrate, add the colonization column to your total.
| Species | Latin name | Days to colonize | Days from FAE* to harvest | Total weeks (block to harvest) |
|---|---|---|---|---|
| Pearl oyster | Pleurotus ostreatus | 10-14 | 7-10 | 1.0-1.4 |
| Blue oyster | Pleurotus columbinus | 10-14 | 7-12 | 1.0-1.7 |
| Pink oyster | Pleurotus djamor | 10-14 | 10-14 | 1.4-2.0 |
| Golden oyster | Pleurotus citrinopileatus | 12-16 | 10-14 | 1.4-2.0 |
| Pioppino | Cyclocybe aegerita | 14-18 | 14-21 | 2.0-3.0 |
| Lion's mane | Hericium erinaceus | 18-21 | 21-28 | 3.0-4.0 |
| Shiitake | Lentinula edodes | 21-28 | 21-35 | 3.0-5.0 |
*FAE = the moment fresh-air exchange begins (block is cut, chamber switches to fruiting mode). For a pre-colonized block, this is day zero of fruiting.
A few honest notes:
- Pearl and blue oyster are the speed champions. Under-two-week home grows are almost always oysters.
- Pink oyster looks fast but varies more. It sprints at 75 to 80°F and stalls in cool rooms. New England growers in winter routinely add a week.
- Shiitake is the patience species. A 5-week total from block to first flush is normal. Second flush takes 14 to 21 more days. Worth it for the flavor.
- Lion's mane is forgiving on schedule, demanding on humidity. It tolerates 65°F but needs 95% humidity or the spines yellow.
For the easiest first grow, see the seven easiest mushrooms for beginners ranked by difficulty.
Day-by-Day: What You'll See in a Lykyn Chamber
This is the HowTo for a single pearl oyster block in a Lykyn smart chamber, starting the day you cut the block open and trigger fruiting mode. It's the most common first grow.
Day 1-2: Setup and Wake-Up
Unbox the block, score an X-shape across the top with a clean knife, place it in the chamber, and tap "Start Pearl Oyster" in the app. The chamber ramps to 92% humidity and starts a 6-hour fresh-air cycle. Externally, nothing visible happens. Internally, the mycelium is responding to the temperature drop and CO2 shift.
Day 3-7: White Fluff and First Pins
By day 3 or 4 you'll see thin white aerial mycelium forming where you cut. By day 5 to 7, gray-blue pinheads emerge. These are primordia. Each pin is the start of one mushroom. Don't touch them.
Day 8-10: Pins Become Mushrooms
Primordia stretch into recognizable mushroom shapes. Caps are tight and curled inward, stems are short. Blue oysters look strikingly colored at this stage. Pearl oysters stay creamy white. Noticeable size change between morning and evening.
Day 11-13: The Cluster Doubles
The fastest growth window. The cluster can literally double in size in 24 hours. Caps flatten and wave at the edges. Stems thicken. The smell sharpens, sweet and slightly anise-like for pearl oyster.
Day 14: Harvest
When caps are nearly flat and the edges just barely curl up rather than in, it's harvest time. Twist the cluster off the block (don't cut, the stub invites rot). Expect 0.8 to 1.25 lbs from a 5 lb block on first flush. Second flush comes 10 to 14 days later at 50 to 70% of first-flush yield.
Full pearl and blue oyster harvest guide here.
What Slows Mushrooms Down
The species table assumes ideal conditions. Three variables can stretch any timeline by 30 to 100%. Worth knowing before you blame the block.
Temperature
The biggest one. Pearl oyster fruits optimally at 65 to 75°F. Drop the room to 58°F and you're looking at 21 days instead of 14. Lion's mane sets pins at 60 to 65°F but dislikes anything above 72°F. Pink oyster wants 75 to 80°F and stops growing below 60°F. If your US home runs cold (older Northeast houses, baseboard heat), add a seedling heat mat. Lykyn chambers don't include active heating, so ambient temperature is the only control.
Humidity
Below 85% relative humidity, pins abort. Above 98%, pooled water invites bacterial blotch. The sweet spot is 90 to 95%. A sensor-driven chamber holds this window automatically. A passive tent + spray-bottle setup usually swings between 70 and 99%, which is why timelines stretch in DIY builds.
Fresh-Air Exchange (FAE)
Mushrooms exhale CO2. Trapped CO2 produces leggy, deformed fruiting bodies and slows maturation. Pearl oyster tolerates around 1,000 ppm. Shiitake wants under 800 ppm. Cornell's mushroom extension publications note that inadequate FAE is the single most common cause of failed home grows after contamination.
Realistic vs Marketing Timelines
You'll see "5-day harvest!" on chamber boxes and grow-kit packaging. Here's the honest decoder:
- "5-day harvest" usually means day 5 from when pins first appear. Add the 5 to 7 days of pin formation and you're at 10 to 14 days from unboxing. Accurate for oysters. Not what the marketing implies.
- "14-day grow cycle" usually means the full block-to-harvest window for an oyster species. Honest.
- "7-day to harvest" is almost always a pearl oyster block that arrived already pinning. Possible, not typical.
Paul Stamets' Growing Gourmet and Medicinal Mushrooms (Ten Speed Press, 2000) publishes timelines that line up closely with our table above. If a product page disagrees significantly with Stamets, the product page is the optimistic one.
Fuel Your Mushroom Journey
Pink Oyster Grow Kit
Hardwood sawdust block colonized with Pink Oyster mycelium. Drops straight into your Lykyn chamber and starts pinning within days.
Add to cart $29.95FAQ
What's the fastest mushroom to grow at home?
Pearl oyster (Pleurotus ostreatus) and blue oyster (Pleurotus columbinus) are the fastest practical options: 7 to 14 days block-to-harvest at US household temperatures. Pink oyster can match this in summer but stalls in cool rooms. For year-round consistency, blue oyster wins.
What slows mushroom growth down?
Three factors, in order of impact: room temperature below the species' optimal range (adds 30 to 100% to the timeline), humidity below 85% (causes pin abortion), and inadequate fresh-air exchange (deforms fruiting bodies and stretches maturation by 3 to 7 days). Light has minimal effect once primordia have formed.
How long does mushroom incubation take?
Mushroom incubation time, from inoculation to fully colonized block, runs 10 to 14 days for pearl and blue oyster, 14 to 18 days for pioppino, 18 to 21 days for lion's mane, and 21 to 28 days for shiitake at 70 to 75°F. A pre-colonized grow block skips this stage entirely.
Do mushrooms grow overnight?
In the peak maturation window (days 11 to 13 for oysters), yes, a cluster can visibly double in 24 hours. Outside that window, growth is slower and steadier. A pin forms over 48 hours. A cap thickens over 3 to 5 days. The overnight explosion only happens once, near the end of the cycle.
Why are my mushrooms taking so long?
Four common causes: room temperature 5 to 10°F below the species' optimum (common in winter), humidity dropping during forced-air heating cycles, a block older than 60 days when fruiting started (mycelium loses vigor), or fresh-air exchange not reaching the block (passive setups). If your block is past day 21 with no pins, check temperature first. It's almost always temperature.
Ready to Start the Clock?
You now know the honest timeline. Pearl oyster gives you a 14-day proof of concept. Lion's mane rewards 28 days of patience with a cluster that looks like white coral. Shiitake takes a month and tastes like nothing else.
The fastest way to lock in those numbers is a chamber that holds humidity and FAE automatically. The Lykyn smart chamber holds 90 to 95% RH within ±2% and runs FAE cycles species-by-species. Pair it with a pre-colonized fruiting block and your day 1 is the day the block arrives.
Start growing today.
Fuel Your Mushroom Journey
Smart Chamber. Bone White Single
- 2.8L tank, 90% humidity automatic
- App-controlled, plug-and-play
- 6 lb block ceiling, in stock
Smart Chamber. Obsidian Black Single
- Same hardware as Bone White
- Matte black premium finish
- Pairs with any kitchen palette
Sources and further reading:
- Stamets, P. (2000). Growing Gourmet and Medicinal Mushrooms, 3rd ed. Ten Speed Press. Species-by-species timelines and substrate guidance.
- Cornell University, Small Farms Program. Mushroom cultivation publications and FAE guidance for indoor production.
- Lykyn Growing Team observations across 500+ growers, 2024 to 2026.
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