How Long Does It Take to Grow Mushrooms?
Quick Answer
2–4 weeks for oyster mushrooms from a kit, 6–12 weeks for shiitake on logs, and 3–6 weeks for most varieties grown on substrate from spawn.
Typical Duration
2 weeks12 weeks
Quick Answer
2–4 weeks for oyster mushrooms using a grow kit, making them the fastest and easiest variety for beginners. Shiitake mushrooms take 6–12 weeks on supplemented sawdust blocks or 6–18 months on hardwood logs. Most mushroom varieties grown from spawn on substrate produce their first flush in 3–6 weeks. The timeline depends heavily on the species, growing method, and environmental conditions.
Timeline by Mushroom Variety
| Variety | Kit Time | DIY Substrate | Log Growing | Difficulty |
|---|---|---|---|---|
| Oyster (Pleurotus) | 2–3 weeks | 3–4 weeks | 3–6 months | Beginner |
| Blue oyster | 2–3 weeks | 3–4 weeks | 3–6 months | Beginner |
| Pink oyster | 1–2 weeks | 2–3 weeks | N/A (tropical) | Beginner |
| King oyster | 3–4 weeks | 4–6 weeks | N/A | Intermediate |
| Shiitake | 3–5 weeks | 6–12 weeks | 6–18 months | Intermediate |
| Lion's mane | 3–4 weeks | 4–8 weeks | N/A | Intermediate |
| Button / cremini | 4–6 weeks | 5–8 weeks | N/A | Intermediate |
| Wine cap (Stropharia) | N/A | 8–16 weeks | N/A (outdoor beds) | Beginner |
| Maitake (hen of the woods) | N/A | 8–16 weeks | 1–3 years | Advanced |
| Reishi | 4–6 weeks | 8–12 weeks | 12–24 months | Advanced |
| Morel | N/A | Experimental | N/A | Very difficult |
Growth Stages Explained
| Stage | Duration | What Happens |
|---|---|---|
| Inoculation | Day 1 | Spawn is mixed with substrate or introduced to logs |
| Colonization | 1–4 weeks | Mycelium (white threads) grows through the substrate |
| Primordia (pinning) | 3–7 days | Tiny mushroom pins appear after environmental trigger |
| Fruiting | 5–10 days | Pins grow into full-size mushrooms |
| Harvest | 1 day | Pick mushrooms just before caps fully flatten |
| Rest period | 1–2 weeks | Mycelium recovers before next flush |
| Additional flushes | Repeats 2–4 times | Each flush produces fewer mushrooms |
Kit vs DIY Growing
Grow Kits (Fastest, Easiest)
Pre-colonized blocks that just need water and air. Best for beginners.
| Step | Time |
|---|---|
| Open kit, cut X in bag or soak block | Day 1 |
| Mist 2–3 times daily | Daily |
| First pins appear | 5–10 days |
| Harvest first flush | 7–14 days |
| Rest, soak, repeat | Every 2–3 weeks |
| Total flushes | 2–4 flushes over 2–3 months |
Pros: Nearly foolproof, fast results, no sterile technique needed.
Cons: Expensive per pound of mushrooms, limited to 2–4 flushes.
DIY Substrate Growing (More Yield, More Work)
Grow from grain spawn on pasteurized straw, sawdust, or supplemented hardwood.
| Step | Time |
|---|---|
| Prepare substrate (pasteurize straw or sterilize sawdust) | 1–2 hours |
| Inoculate with grain spawn | 30 min |
| Colonization (incubate at 70–75°F) | 2–4 weeks |
| Initiate fruiting (lower temp, increase humidity and air) | 1–2 days |
| Pins appear | 3–7 days |
| Harvest first flush | 5–10 days after pinning |
| Total harvest over multiple flushes | 2–3 months |
Log Growing (Best for Shiitake)
Inoculate hardwood logs with plug spawn for outdoor growing that produces for years.
| Step | Time |
|---|---|
| Cut fresh hardwood logs (oak is ideal) | Late winter |
| Drill holes, insert plug spawn, seal with wax | 1–2 hours per log |
| Stack logs in shade, keep moist | Ongoing |
| Colonization period | 6–18 months |
| Force fruiting by soaking logs in cold water | 24 hours |
| Harvest mushrooms | 7–10 days after soaking |
| Repeat soaking every 6–8 weeks | For 3–6 years |
Ideal Growing Conditions
| Factor | Most Varieties | Button/Cremini | Oyster |
|---|---|---|---|
| Fruiting temp | 55–70°F | 60–65°F | 55–75°F |
| Humidity | 85–95% | 85–90% | 80–95% |
| Light | Indirect, 12 hr/day | Minimal | Indirect, 12 hr/day |
| Fresh air | High (CO2 triggers leggy growth) | Moderate | High |
| Substrate | Hardwood sawdust, straw | Composted manure | Straw, cardboard, coffee grounds |
Indoor Growing Setup
A simple indoor fruiting chamber can be built for under $50:
- Shotgun fruiting chamber (SGFC): Clear plastic tote with 1/4" holes drilled every 2 inches on all sides. Line bottom with damp perlite. Cost: $15–20.
- Martha tent: Wire shelving unit inside a clear plastic greenhouse cover. Add a humidifier on a timer. Cost: $40–60.
- Monotub: Large plastic tub with holes covered in polyfill. Good for bulk substrate grows. Cost: $10–15.
Yield Expectations
| Method | Typical Yield | Notes |
|---|---|---|
| Grow kit (5 lb block) | 1–2 lbs total | Over 2–4 flushes |
| DIY bucket (5 lbs straw) | 2–3 lbs total | Over 2–3 flushes |
| Supplemented sawdust block (5 lb) | 1.5–3 lbs total | Commercial method |
| Log (3 ft, 4" diameter) | 1–2 lbs/year | Produces for 3–6 years |
| Outdoor bed (4x8 ft) | 5–15 lbs/season | Wine caps, elm oysters |
Common Mistakes
- Not enough fresh air – high CO2 causes long, thin stems with tiny caps. Increase ventilation.
- Low humidity – mushrooms abort or crack. Mist frequently or use a humidifier.
- Contamination – green mold (Trichoderma) is the most common problem. It means your substrate wasn't properly pasteurized or your environment isn't clean enough.
- Too much water – waterlogged substrate breeds bacteria. Substrate should feel damp like a wrung-out sponge.
- Direct sunlight – mushrooms need indirect light only. Direct sun dries them out and overheats the substrate.
- Harvesting too late – pick mushrooms just before or as the cap edges begin to flatten. Waiting too long reduces shelf life and triggers spore release.