I Compared 4 Mushroom Grow Kits by Price-Per-Gram, Here's What the Numbers Actually Show

Nobody publishes the actual yield math on mushroom grow kits, and that’s irritating. Every mushroom grow kit comparison you’ll find ranks them by vibes (“great for beginners!”, “loved the instructions!”) and skips the numbers that actually tell you whether a kit is worth buying. So here’s the table that doesn’t exist anywhere else.

Product Rating

North Spore Organic Pink Oyster Mushroom Grow Kit, 4 lbs 4 lb sawdust-based kit produces 0.5-1.5 lbs pink oyster mushrooms in 14-21 days with daily misting on countertops ~$24.99 4.2★ (549) Check Price on Amazon Forest Origins Pink Oyster Mushroom Grow Kit, Beginner ... Single pink oyster fruiting block yields harvest in 10 days with daily misting, ideal for indoor beginner growers. ~$28.99 4.3★ (1,428) Check Price on Amazon North Spore Organic Blue Oyster Mushroom Grow Kit, 4 lbs 4 lb blue oyster kit produces 0.5-1.5 lbs of mushrooms in 14-21 days, ideal for indoor cultivation with minimal experience required. ~$24.99 4.2★ (475) Check Price on Amazon North Spore Organic Lion's Mane Mushroom Grow Kit, 4 lbs 4 lb lion's mane kit yields 0.5-1.5 lbs mushrooms in 14-21 days with daily misting, ideal for indoor countertop growing. ~$24.99 4.2★ (1,799) Check Price on Amazon

The Price-Per-Gram Breakdown

Here’s what the data actually shows:

A few things jump out from that table. First, the substrate weight gap between Back to the Roots and the North Spore blocks is roughly 6x for about a 20-30% price difference. That’s not a close call. Second, the misting burden is similar across all kits once you’re in the daily routine, but Back to the Roots is the only one that requires an overnight pre-soak before you even start.

The pre-soak thing matters more than it sounds. You have to plan ahead, find a container big enough, and remember to do it the night before. North Spore ships ready to fruit. Cut the bag, mist twice a day, done.

The Shelf-Age Problem Nobody Mentions

This is the thing that explains most beginner kit failures, and I’ve never seen it in a comparison article.

Back to the Roots kits sit on retail shelves at Target and Walmart for 5-6 months before you buy them. Mushroom mycelium is alive. It doesn’t care that it’s been sitting under fluorescent lights in a cardboard box since January. By the time you get it home in June, you’re working with mycelium that has been slowly drying out and stressing for months. The common complaint is receiving what amounts to dry logs in cardboard with zero moisture protection. No second flush, full mold.

North Spore and Hodgins Harvest ship direct. The block arriving at your door is weeks old, not half a year. That difference in freshness shows up immediately in pinning speed and first-flush size. I weighed both blocks flush by flush in North Spore vs Hodgins Harvest .

North Spore blocks can also be stored in the fridge for up to 6 months before you open them, which is useful if you want to time a grow around a trip or a holiday dinner. Back to the Roots offers no such flexibility, partly because by the time you’ve bought it, the substrate’s storage clock is already well along.

If you’re set on Back to the Roots for whatever reason, buying it directly from Amazon rather than a physical store shelf is probably the smarter move. At least you get some kind of shipping date to reference. The direct head-to-head is in North Spore vs Back to the Roots .

Kit-by-Kit Verdict

Back to the Roots is good at one thing: being accessible. It’s at every Target. Kids respond to it. The #GrowOneGiveOne program (post a photo, they donate a kit to a classroom) is a real thing and a nice touch. First pins by day 4, visible growth by day 8. Independent testing clocked 35g on the first flush, which is honest, and yields can reach 110g first flush with 230g total across three flushes, so results vary widely based on block freshness. Three servings of mushrooms across the whole grow is a fair expectation. That’s not nothing, but it’s not dinner for the week.

North Spore Spray & Grow (available in pink oyster, blue oyster, and lion’s mane) is where the math gets good. At 4 lbs of substrate for $30-35, and a first flush in the 147g range from independent testing, you’re at roughly $0.06-0.07 per gram of fresh mushrooms. That’s cheaper than most grocery store prices for specialty oysters. The twice-daily misting is real maintenance though. First-flush success rate with North Spore is noticeably better than Back to the Roots, larger substrate mass holds moisture through minor lapses, and the block doesn’t carry months of retail shelf stress into your first grow.

The instructions are specific and clear, which matters more than people give it credit for. Most kit failures trace back to not knowing what healthy pinning looks like, or harvesting two days too late.

Hodgins Harvest Lion’s Mane buy on Amazon is the kit for patient growers who want maximum output over time. The documented flush count tops out at 5 in real-world growing conditions, where most oyster kits stop at 2-3. Lion’s mane is slower than oyster mushrooms generally, and the kit is heavy. But the instructions are unusually specific, telling you when to harvest by observable benchmarks rather than “when it looks done,” which is useful when you’ve never grown before.

Five flushes vs two flushes changes the total value math entirely. If you’re comparing long-term cost per gram across the full life of a kit, Hodgins Harvest lion’s mane is competitive with North Spore’s per-flush pricing because you’re getting so many more harvests from one block. That gap is the real argument for lion’s mane over oyster .

Forest Origins pink oyster check current price sits in a middle tier. It’s widely available on Amazon with next-day shipping, doesn’t require specialty sourcing, and pink oysters are fast-fruiting. Pins can appear within 5-7 days in warm conditions. The block is smaller than North Spore’s 4 lb versions, so price-per-gram is slightly worse, but the Amazon availability and variety range make it a reasonable pick if you don’t want to order from a specialty grower directly.

🏆 Best Value Overall North Spore Organic Pink Oyster Mushroom Grow Kit, 4 lbs 4 lb sawdust-based kit produces 0.5-1.5 lbs pink oyster mushrooms in 14-21 days with daily misting on countertops 4.2★ ~$24.99 Check Price on Amazon

Can You Reuse a Spent Block?

Yes, with caveats.

For oyster blocks (North Spore’s pink or blue oyster), the standard rehydration protocol is to soak the block cut-side down in cold water for 1 hour after your first harvest, then go back to twice-daily misting. The logic is that the block has given up most of its surface moisture into mushroom production and needs a full reset.

Lion’s mane is more sensitive to over-soaking. 10-15 minutes is the recommended window for lion’s mane blocks. More than that and you risk waterlogging the mycelium.

Spent Back to the Roots blocks have a different second life entirely. Burying the spent substrate in moist outdoor soil, under a deck or in a shaded garden bed, can produce small bonus flushes. It won’t replace the kitchen grows, but if you’re throwing the block out anyway, it’s worth trying.

The honest answer on reuse is that first and second flushes tend to be the productive ones for oyster varieties. Third and fourth flushes are real but smaller. With lion’s mane and Hodgins Harvest specifically, the flush count stays productive longer, which is part of why that kit earns its slow-growing reputation.

This article is part of my Gourmet Mushroom Grow Kits: The Complete Guide , a complete resource for growing gourmet mushrooms on your counter.

Frequently Asked Questions

How much yield can I expect from a mushroom grow kit?

It depends heavily on block size and freshness. Back to the Roots (0.5 lb substrate) delivers 35-110g on the first flush depending on block age, with 230g possible across three total flushes. North Spore’s 4 lb blocks produce around 147g on the first flush in consistent conditions, with 0.5-2 lbs total yield across multiple flushes. Smaller blocks simply have less substrate to fuel fruiting.

Are mushroom grow kits worth buying?

For cooking, a 4 lb kit like North Spore at $30-35 generates real meal-quantity mushrooms at roughly $0.06-0.08 per gram, which is competitive with specialty grocery store pricing. Smaller kits like Back to the Roots are better thought of as educational projects. You’ll grow mushrooms. You won’t replace your grocery run.

How do I get more flushes from a mushroom grow kit?

Proper rehydration between flushes is the whole game. For oyster kits, soak the block cut-side down in cold water for 1 hour after each harvest, then resume misting. For lion’s mane, limit soaking to 10-15 minutes. Hodgins Harvest growers consistently report up to 5 flushes with this approach, more than any other kit in this comparison. It is also the fix for most kits that look like they have stopped producing .

What is the easiest mushroom to grow for beginners?

Oyster mushrooms. Pink oyster is the fastest, pinning in 5-7 days in warm conditions. Blue oyster is slightly more forgiving of temperature variation and tends to have a higher first-flush success rate in cool apartments. Both species tolerate minor humidity lapses better than lion’s mane or shiitake, and the signs of healthy growth are easier to read.

What’s the best mushroom grow kit?

For yield per dollar, North Spore Spray & Grow at 4 lbs and $30-35 with roughly $0.06-0.07 per gram. For flush count, Hodgins Harvest lion’s mane at up to 5 flushes. For classroom or kids, Back to the Roots because it’s everywhere and hard to catastrophically fail. For Amazon availability with decent variety, Forest Origins.

Can I reuse a spent mushroom grow kit?

Yes. Oyster blocks should be soaked cut-side down for 1 hour, then returned to misting. Lion’s mane needs only 10-15 minutes of soaking. Spent Back to the Roots blocks can also be buried in moist outdoor soil for occasional small bonus flushes, which is a reasonable use for something you’d otherwise throw away.

And one thing the FAQ can’t quite capture: the difference between a 0.5 lb and a 4 lb block isn’t just yield, it’s the entire experience of growing. Larger blocks are more stable, they maintain humidity better, they recover between flushes more reliably, and they give you enough mushrooms that the work actually feels worth it. The yield gap isn’t surprising once you know the substrate weights. But grams-per-dollar is the number nobody publishes, and it’s the only number that actually matters when you’re deciding whether to buy a second kit. So if you’re also running a countertop hydroponic garden and want to understand how substrate choice affects your other crops, my growing media comparison breaks down rockwool vs peat vs coco coir for pod systems. And if you’re newer to countertop growing generally, the beginner mistakes post covers the setup errors that trip people up on both mushroom kits and herb gardens.