North Spore vs BloomBox mushroom grow kit is a comparison that sounds simple on the surface, two spray-and-grow formats, similar price points, both targeting the same casual home grower. But the differences underneath matter more than the packaging suggests. North Spore has a paper trail. Independent reviewers have published yield weights, and if you get a contaminated kit, customer service replaces it without argument. BloomBox buy on Amazon is sold on Amazon, ships to your door, and its manufacturer’s website has been under construction since at least July 2026.
That asymmetry is the whole story, and no other comparison article says it plainly. And honestly, it’s frustrating that you have to dig this deep just to figure out whether the company behind a product you’re planning to eat from even has a working website.
Quick Answer: North Spore check current price is the safer buy. It’s USDA certified organic, the yield data is real and documented, and if something goes wrong, you’ll get a replacement. BloomBox costs a few dollars less, but its manufacturer (Nublume) has a website that’s been “under construction” for months, there’s no independent yield data, and no organic certification. For a gift or a first grow, go North Spore. If you find BloomBox at a local plant shop for $25 and you just want to try something, that’s fine. Ordering it online from a brand with no working website is a different calculation.
Oyster Mushroom Grow Kit | USDA Certified Organic
USDA-organic 3.5 lb oyster kit with humidity dome, first flush in 10-21 days, up to 2 lbs total
~$24.99
BloomBox Blue Oyster Mushroom Grow Kit – Spray & ...
Pre-inoculated blue oyster block kit, first flush in about a week, up to 1 lb total yield
~$24.99
BloomBox Lion's Mane Mushroom Grow Kit – Spray & ...
Pre-inoculated lion's mane block kit, pins around day 4-5, first harvest in about a week
~$24.99
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
What You’re Actually Comparing
Both kits use the spray-and-grow format. You open the box, cut an X in the plastic bag, mist a few times a day, and wait. That’s the same process for both brands. The differences are in what’s inside the bag and who made it.
North Spore’s Spray & Grow blocks are 4 lbs of USDA certified organic substrate, made in Maine. The lion’s mane kit see on Amazon claims 0.5 to 1.5 lbs of mushrooms from the first flush, with first pins appearing in 7-14 days and a harvestable flush by day 14-21. Documented first-flush results from independent testers put the blue oyster around 147g, with second flushes coming in near 90g, the best second-flush retention of any kit in that comparison. Pink oyster growers under good conditions tend to see 7-8 oz per flush across two harvests, though “relatively small mushrooms for the price” is a complaint that shows up in feedback on the kits.
BloomBox claims first mushrooms in 7-14 days. The blue oyster kit check price on Amazon retails around $25 at some plant retailers and higher on Amazon. The lion’s mane available on Amazon runs $30-35. No independent tester has published yield weights. No editorial source has reviewed it at all. The only comparison chart that includes BloomBox was written by a competing brand promoting itself, which is not a source I’d trust for BloomBox’s numbers. Its measured yields come up again in my Hodgins Harvest vs BloomBox comparison .
That’s the data gap. North Spore: documented. BloomBox: unknown. And that gap doesn’t close just because the Amazon listing looks polished.
The Manufacturer Transparency Problem
This is the thing that would actually make me hesitate before clicking “buy” on BloomBox.
Nublume, the company behind BloomBox, has a website. Or it had one. As of July 2026, nublumemushroom.com is listed as under construction. No about page, no contact form, no growing guides, nothing. The kits are still live on Amazon, the listings look fine, but if you need support after your block arrives, your options are email only, into what appears to be a company that isn’t currently maintaining a public web presence.
It’s irritating, you’re buying a living product you’re going to eat, and the manufacturer can’t be bothered to keep a contact page online.
North Spore is the opposite. They’re a Maine-based company with a full website, a blog with actual growing guides, and a documented history of replacing bad kits. People have received contaminated blocks, reported it, and gotten replacements without a fight. That’s not rare for North Spore; it comes up often enough that it’s clearly a policy, not a lucky exception. The common experience is receiving a block with bacterial contamination, reporting it, and getting a replacement sent out promptly, no argument, no runaround. Customer service being responsive matters a lot when you’re dealing with a living product that can arrive in bad shape.
BloomBox’s Amazon listing has reviews. Some people got good grows. But “it worked for me” reviews and “the company replaced my bad kit” reviews are two different things, and I only have evidence of the latter for North Spore.
Oyster vs Lion’s Mane: Does Brand Choice Change by Species?
For oyster mushrooms, North Spore is the documented choice. The yield data exists, the process is tested, and oysters are forgiving enough that even an imperfect setup usually produces something.
Lion’s mane is trickier, and the brand choice matters less than what you do with the kit. The most common failure mode with lion’s mane grow kits isn’t humidity. It’s airflow. Without enough fresh air exchange, lion’s mane grows stringy and starts browning before it ever forms those dense, shaggy clusters the kits promise. Growers who’ve fixed this by removing the humidity tent entirely and relying on a wet towel under the block for passive humidity tend to get dramatically better results, including second flushes from kits that looked like they were failing. The full species comparison is in lion’s mane vs oyster kits .
North Spore’s lion’s mane instructions say mist 2-3 times daily and maintain humidity. That’s correct but incomplete. The instructions don’t tell you that airflow beats humidity as the key variable, or that a plastic tent over a lion’s mane kit is often the reason it fails. BloomBox’s educational guide presumably covers similar ground. Neither brand gets this quite right.
So for lion’s mane specifically: whichever kit you buy, ditch the tent early, keep a fan on low nearby, and mist to compensate. That’s the actual fix.
Who Should Buy Which Kit
Gift buyer who wants something that looks good under a tree: North Spore. The USDA organic certification is something you can point to. The packaging is clean. If the recipient has questions, there’s a company with a real website that can answer them.
Someone testing a species before committing to DIY growing: North Spore. The pre-colonized fruiting blocks are reliable enough that a failure is more likely environmental than a kit problem, which gives you useful data. The grain bag kits with spore syringes are a different product entirely and have a higher failure rate. Stick to the Spray & Grow line.
Casual buyer who found BloomBox at a local plant shop for $25: Fine. Buy it. If it’s right in front of you, you can evaluate the packaging, the block looks hydrated and healthy, and you’re not depending on a company’s customer service, the price difference is real and the growing process is the same.
Someone ordering BloomBox online specifically because it’s a few dollars cheaper: I’d push back on that. The manufacturer transparency issue is a real risk. If your block arrives dry, contaminated, or just doesn’t pin, you’re contacting a company whose website is currently down. That’s not a theoretical concern.
But for most people reading this, North Spore is the simple answer.
⭐ My Pick
Oyster Mushroom Grow Kit | USDA Certified Organic
USDA-organic 3.5 lb oyster kit with humidity dome, first flush in 10-21 days, up to 2 lbs total
Check Price on AmazonThis 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
Are mushroom grow kits worth buying?
For a gift or a casual first grow, yes. The convenience is real, and the markup over DIY is a fair trade if you’re not ready to deal with sterilizing substrate, buying spawn, and managing contamination risks yourself. Serious growers often buy one kit to test a new species before investing in cultures and equipment, which is also a legitimate use. Where they stop making sense is as a long-term growing strategy. The per-flush cost is high compared to even a modest DIY setup.
What are the common problems with mushroom grow kit boxes?
The three failure modes worth knowing: trichoderma (blue-green mold, remove the block immediately), bacterial contamination (slimy patches, sour or sweet smell, also remove it), and cobweb mold (gray and wispy, can sometimes be managed with airflow). For lion’s mane specifically, browning and stringy growth before a proper flush is usually an airflow problem, not contamination. It looks alarming but it’s fixable if you catch it early.
How much yield can I expect from a mushroom grow kit?
It varies more than the packaging suggests. North Spore’s 4 lb blocks claim 0.5-1.5 lbs total across flushes. Measured results put a first flush at roughly 147g for blue oyster, with a second flush of about 90g from the same block. Pink oyster growers tend to see 7-8 oz per flush under good conditions. Second flushes are smaller and sometimes don’t appear at all if the block dries out or gets contaminated after the first harvest.
Is North Spore organic?
North Spore’s Spray & Grow kits are USDA certified organic. The substrate is made in Maine, and the certification covers the growing medium, not just the species. BloomBox makes no organic certification claim in its product listings. If organic certification matters to you, that’s a North Spore decision.
Does North Spore sell psychedelic mushroom spores?
No. The Spray & Grow kits grow gourmet edible species only: oyster varieties, lion’s mane, shiitake, and similar. North Spore does sell mushroom cultures and spawn for DIY growing, but those are edible gourmet species as well.
How do I get the most out of my mushroom grow kit?
Mist 2-3 times daily, keep the room between 65-75°F, and prioritize fresh air exchange over humidity. For oysters, a loose plastic cover helps retain moisture early on. For lion’s mane, skip the tent sooner than you think, add a gentle fan, and maintain humidity passively with a wet towel under the block. Harvest before the caps flatten or the clusters start to pull away at the edges. Waiting too long on the first flush gives you bitter mushrooms and a stressed block that may not produce a second.
BloomBox might be a perfectly good kit. I don’t know, because nobody has tested it independently and the company behind it isn’t maintaining a public presence. That’s not a small thing to overlook when you’re buying something alive that you’re planning to eat.