If you searched for manure substrate for mushroom vs Mushy Substrates, you are likely weighing 10 LBS Coco Mushroom Substrate with Added Cow against North Spore ‘Boomr Bag’ Sterile Mushroom Bulk for your next dung loving grow. Both ship hydrated and ready to mix with colonized grain spawn, yet they point to different routines and batch sizes. One centers on a cow manure CVG formula in a large single bag, while the other relies on a composted horse manure blend in a smaller modular bag.
You need a clear answer on which option holds field capacity better, fits your monotub plan, and matches your comfort with sterile handling. We reviewed ingredient disclosures, bag construction, hydration statements, and grower ratings to sort tradeoffs for November 2026. If bulk work is still new to you, browse our Substrate, CVG & Bulk Amendments guide first, then return here to lock in your pick with confidence.
This article contains affiliate links. If you buy through one of our links, FungiPop may earn a commission at no extra cost to you. Commissions never influence which products we recommend or how we rank them. Read our Affiliate Disclosure for details.
Quick Picks at a Glance
Prime SGM LABS 10 LB Coco Mushroom Substrate CVG
Prime Myco Labs Premium 5 LB Pasteurized Bulk Mushroom
Prime Myco Labs 4LB All-in-One Mushroom Grow Bag
Prime North Spore Boomr Bag 5 lb Sterile Manure-Based
Prime Sporenity's Pre-sterilized Hardwood Blend
As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated.
Pros
- Perfectly hydrated out of the bag with no prep work required
- Clean sterilized substrate with strong resistance to contamination
- Fast colonization reported by beginner and experienced growers
- Flexible use in monotubs, as casing, or in bag growing
- Quality CVG plus cow manure for improved nutrition and yields
Cons
- Spawned grain must be purchased separately to start growing
- 10 lb size may require multiple bags for large monotubs or bulk runs
- Sterility depends on careful handling once the bag is opened
This 10 lb Cow Coco substrate from SGM LABS is a sterilized CVG mix made for mushroom fruiting in monotubs, as casing, or directly in the bag. It is built for first time growers, hobbyists, and bulk cultivators who want a ready to use solution without mixing their own substrate.
The blend combines coco coir, cow manure, vermiculite, and gypsum to supply nutrition, moisture retention, and structure for mycelium growth. In real world use, growers report fast colonization, ideal hydration, and clean runs with no contamination when good sterile technique is followed.
Build quality centers on the pre-hydrated 0.2 micron filter bag that keeps the substrate sterile until you are ready to inoculate. The 10 pound, 7 liter fill provides solid volume for standard tubs while staying manageable to pour, mix, and store.
There are a few limits to plan for, including the need to supply your own spawned grain and maintain sterility after opening. Large scale grows may need multiple bags, and the bag is bulky to handle and store compared to dry compressed bricks.
Overall, this is a reliable, beginner friendly, high yield substrate that removes guesswork from prep and hydration. If you want consistent moisture, clean performance, and flexible growing options, it is an excellent choice for your next run.
Brand: SGM LABS, Item Type: Cow Coco CVG Substrate, Weight: 10 pounds
Volume: 7 liters, Unit Count: 160 fluid ounces, Style: Modern
Material Blend: Coco coir, cow manure, vermiculite and gypsum, Bag Filter: 0.2 micron sterilized fruiting bag
Use Methods: Monotub fill, casing layer, or grow in bag, Manufacturer Part Number: 10lbcowcocosubstrate
Pros
- Ready to use with no prep, just add grain spawn
- Excellent moisture retention held at field capacity
- pH balanced formula supports fast, healthy colonization
- Beginner friendly yet effective for experienced growers
Cons
- Recent switch to vacuum sealed bags reported as wetter than previous filter patch bags
- Some users noted an off smell and reduced success with newer batches
- Formulated only for dung and grain loving types, not universal for all mushrooms
Myco Labs Premium Bulk Mushroom Substrate Mix is a pasteurized, pre-hydrated 5 lb substrate designed for dung and grain loving mushrooms. It is made for home cultivators who want a convenient, ready to use base to mix with grain spawn without measuring or hydrating from scratch.
The standout is the gentle pasteurization process that retains beneficial nutrients and nitrates for mycelium instead of destroying them. Combined with high water retention at field capacity and a calcium enriched pH balance, users report fast colonization and satisfying yields with proper technique.
Each bag comes pre-hydrated and pasteurized in a bulk 5 lb format that is simple to handle and apply. The texture is formulated to stay moist yet airy, giving mycelium the stable, supportive environment it needs to spread evenly.
Performance is not perfect for everyone, as some long term users report recent batches in vacuum sealed packaging feel wetter and have an unusual smell. Those reports mention lower success rates compared to the older filter patch bags, so consistency can vary.
Overall, this is a strong time saving option for beginners and experienced growers focused on dung loving varieties. If you want convenience, balanced nutrition and reliable moisture out of the bag, it is a practical pick when used with good sterile practice.
Brand: Myco Labs, Item Type: Substrate Bag, Unit Count: 80 Fluid Ounces.
Item Weight: 5 pounds, Volume: 5 liters, Style: American.
Compatibility: Designed for dung and grain loving mushrooms for use with grain spawn, pre-hydrated and pasteurized for immediate use.
Pros
- Fast, clean colonization reported when inoculated with liquid culture, including large flushes
- Included germination jar helps stretch genetics and confirm viability before committing the bag
- Truly beginner friendly with ready to inject, pre-sterilized grain and substrate
- Large capacity and all in one convenience eliminates substrate prep and extra equipment
Cons
- Colonization can be slow to start and requires patience, with timing varying by technique
- Some bags reported with overly wet grains or imperfect top seals from handling
- Still requires careful sterile injection technique to avoid contamination
The Myco Labs AIO6 is a 4 pound all in one mushroom grow bag paired with a 30ml spore germination jar for manure loving mushrooms. It is made for beginners who want a ready to inject system and for pros who want to skip substrate prep.
Its standout feature is the mini liquid culture jar that lets you turn spores into visible mycelium before touching the main bag. In real world use, many growers report fast, clean colonization and strong flushes when inoculating with liquid culture.
The bag combines pre-sterilized grain and substrate in a self contained injection format with balanced mix ratio. Grains arrive well hydrated and the bag feels large and substantial, with ample grain to support vigorous growth.
Results are not instant and some grows take over two weeks to show visible progress, which can test first timers. A few users have noted wet or compressed grains and occasional seal issues, so sterile technique and gentle handling remain important.
Overall, this is a convenient, high potential kit that improves odds by letting you verify genetics first. If you want an easy, low equipment way to grow without building a monotub, it is a smart pick.
Brand: Myco Labs, Model Number: AIO6, Format: All in one grow bag with 30ml culture jar.
Intended Use: Mushroom growth for manure loving varieties, Application Method: Injection.
Components: Pre-sterilized grain and substrate bag plus mini liquid culture jar, Unit Count: 1 Count.
Item Form: Bag, Target Species: Mushrooms, Item Weight: 4 pounds.
Choose this kit if you want to avoid sterilizing grain, mixing substrate, or managing a monotub. It is best for home growers who prefer a contained, injection based workflow.
For best results, germinate in the culture jar first, then inoculate the bag with active mycelium using sterile technique. Allow time for colonization and avoid injecting too deep or disturbing the bag early.
Inspect on arrival for seal integrity and grain condition, and store in a clean, stable temperature space during colonization. Patience and cleanliness will have the biggest impact on your outcome.
Pros
- Sterile and ready to use with no pasteurization, mixing or hydration required
- Formulated specifically for dung-loving species to support fast colonization and better yields
- Works across multiple methods, ideal for beginners and experienced bulk growers
- Filter patch bag and moisture balanced texture for healthy mycelium growth
- Made in USA with quality composted manure and coco coir base
Cons
- Exact supplement blend is proprietary, so you cannot adjust the recipe
- Requires separate colonized grain spawn, not an all in one grow kit
- Single 5 lb bag may not be enough for large monotubs or outdoor beds
The North Spore Boomr Bag is a 5 lb sterile bulk substrate built for dung loving mushroom species. It is made for beginners and experienced growers who want a ready to use base for monotubs, bags and outdoor beds.
The blend combines composted horse manure, coco coir and added supplements to support strong colonization and improved yields. Because it arrives sterile and hydrated to field capacity, you can mix it directly with colonized grain spawn without extra prep.
Built in a filter patch bag, it allows proper gas exchange while helping reduce contamination risk. The texture holds moisture well, and the USA made formula feels consistent, clean and professionally prepared.
The exact supplement blend is proprietary, so precise customization is limited. You will also need separate grain spawn, and larger projects may require multiple bags to fill big tubs or beds.
For growers who want reliable results without pasteurizing manure at home, the Boomr Bag is a practical upgrade. It saves time, simplifies spawn to bulk, and delivers a trusted foundation for productive grows.
Brand: North Spore, Style: Sterile substrate in filter patch bag.
Size: 5 pounds, 80 ounce count, 4.75 liters volume.
Material: Composted horse manure, coco coir plus substrate supplements, hydrated to field capacity.
Best for: Monotubs, filter bags, trays, Martha setups and outdoor beds for dung loving species.
Recommended use: Mix 1 colonized grain spawn bag with 2 to 3 Boomr Bags.
Mix one fully colonized grain spawn bag with two to three Boomr Bags for reliable colonization. Break up the spawn, blend evenly, then incubate in your monotub, bag or tray.
Maintain proper humidity and fresh air exchange for your chosen setup. For outdoor beds, layer the mix in a shaded spot and keep it moist but not waterlogged.
This substrate is best for dung loving species. If you are new to bulk growing, start with one tub to learn the process before scaling up.
How They Compare
We focused on four factors that shape bulk results with manure blends: recipe and manure source, preparation method, bag weight with hydration and spawn ratio, plus day to day ease and feedback. Both products claim strong support for dung loving species, so real differences show up in handling, sizing, and transparency rather than promises alone. Use the axes below to match each bag to your tub size and workflow.
Manure Base and Nutrient Recipe
The 10 LBS Coco Mushroom Substrate with Added Cow lists Coco Coir, Cow Manure, Vermiculite, and Gypsum in a CVG style mix fortified with nutrients your mycelium needs to move from spawn run to fruiting mushrooms. The North Spore ‘Boomr Bag’ Sterile Mushroom Bulk uses a proprietary blend of composted horse manure, coco coir, and several quality substrate supplements formulated by mycologists to increase yield. In short, you are choosing between an open cow manure CVG recipe and a closed horse manure recipe with added supplements.
For dung loving mushrooms, both approaches can perform well when your spawn is vigorous and your tub has steady fresh air exchange and humidity. Cow based CVG tends to feel familiar if you already mix coco, vermiculite, and gypsum, plus it doubles as casing or monotub fill for flexible use. Horse manure with coco tends to feel richer and slightly more textured, which growers commonly report as helpful for even colonization when spawn is distributed thoroughly through the mass.
Sterile Handling and Contamination Buffer
The 10 LBS Coco Mushroom Substrate with Added Cow arrives as a sterilized fruiting bag in a 0.2 micron bag that is pre hydrated, so spawned grain can expand in a clean environment without competition from outside organisms. The North Spore ‘Boomr Bag’ Sterile Mushroom Bulk is described as sterile bulk substrate hydrated to field capacity and refined over several years for consistent results. Neither bag asks you to hydrate, adjust pH at home, or run a pasteurization cycle before mixing with grain spawn.
Sterilized and sterile sound similar, but handling after opening still decides much of your success. A single large sterilized bag gives you fewer openings and less measuring, yet a single slip during mixing could affect the whole batch at once. Smaller sterile bags let you isolate risk across multiple units, though every extra opening adds another chance for airborne contaminants if your room airflow is dusty or your spawn was not fully colonized and strong.
Bag Weight, Hydration and Spawn Ratio
Weight is the clearest split between these two picks. The 10 LBS Coco Mushroom Substrate with Added Cow gives you 10 LBS in one bag, while the North Spore ‘Boomr Bag’ Sterile Mushroom Bulk gives you 5 lb per bag. Both claim ready moisture, with one listed as pre hydrated and the other noted as hydrated to field capacity for immediate mixing. North Spore recommends mixing 1 colonized grain spawn bag with 2 to 3 Boomr Bags, which helps you plan monotub fills and spawn ratios without guessing moisture by feel alone.
If you run a roomy monotub, the 10 LB format lets you dump substrate into the tub or dump grain directly into the CVG bag with minimal splitting and fewer seals to manage. If you run smaller tubs, filter patch bags, outdoor beds, or trays inside a humidity controlled Martha setup, the 5 lb modular size makes it easier to stagger grows over time. For monotub loading ideas and tub style comparisons, see our best masters mix substrate for monotub breakdown to visualize how bag size affects depth and coverage.
Ease of Use and Grower Feedback
The 10 LBS Coco Mushroom Substrate with Added Cow holds 4.5 out of 5 from 132 reviews, with positioning for first time growers, hobbyists, and bulk large scale cultivators who want a simple dump and mix workflow. The North Spore ‘Boomr Bag’ Sterile Mushroom Bulk shows 4.2 out of 5 with 0 reviews in the current feed, yet the listing notes it is a best selling manure based substrate perfected over several years and built for every type of grower. In other words, marketplace feedback currently favors the cow CVG bag, while brand reputation and long refinement carry much of the Boomr Bag story for new buyers.
The large cow CVG bag can be awkward to shake and blend evenly, especially if you only have one grain bag ready and need to store the remainder without drying the corners or compacting the center. The Boomr Bag solves mixing with smaller units that are easier to knead, but you will handle more plastic, spend more time sealing, and you cannot see or tweak the exact supplement ratio because the blend is proprietary. If you like to adjust gypsum or vermiculite yourself for texture, that secrecy might frustrate you over multiple runs.
Which One Should You Get
Choose 10 LBS Coco Mushroom Substrate with Added Cow if you want maximum bulk in one purchase for a large monotub or for back to back casing work without splitting bags. You get a familiar CVG structure with cow manure, pre hydrated convenience in a 0.2 micron bag, and the option to fill the tub, use it as casing, or fruit directly in the bag. This is the smoother pick when you already have strong grain spawn and want fewer bags to open, hydrate, and store between flushes.
Choose North Spore ‘Boomr Bag’ Sterile Mushroom Bulk if you prefer modular 5 lb bags, a composted horse manure base, and flexible fruiting in monotubs, filter bags, outdoor beds, or trays inside a Martha setup. The stated spawn to bulk guidance of 1 grain bag to 2 to 3 Boomr Bags helps you portion correctly and helps experienced growers stagger harvests across the month. This is the better fit when you value small batch control, cleaner portioning, and a recipe refined specifically for dung loving species over several years.
Who Should Skip Both
You might skip both bags if your grow is centered on wood loving gourmet species rather than dung lovers, because both manure blends are not ideal for lion’s mane, shiitake, or oyster grown on sawdust where a hardwood formula holds structure better, as explained in our how to use hardwood substrate for Lion’s mane 10lb guide. Beginners who want grain and substrate together might prefer the Myco Labs All-in-One Mushroom Grow Bag for Manure with its germination jar, a path covered in our Grow Bags, Spawn Bags & Liquid Culture hub. Strictly hardwood growers can look at Sporenity’s Pre-sterilized Hardwood Blend instead, while pasteurized bulk fans can consider the Myco Labs Premium Bulk Mushroom Substrate Mix in the list above.
Frequently Asked Questions
Is cow manure CVG or composted horse manure better for dung loving mushrooms in a monotub?
Both can produce full monotub flushes when paired with vigorous grain spawn and stable humidity and air exchange. Cow manure CVG offers a familiar coco, vermiculite, and gypsum structure that is easy to spread as casing or tub fill. Composted horse manure with coco and supplements often feels denser in nutrition, which many growers prefer for dung loving varieties when spawn ratio and fresh air are dialed in.
Do I need to add water or pasteurize these manure bags before use?
No additional hydration step is listed for either option in the product details. The cow CVG bag is described as pre hydrated in a 0.2 micron bag and ready to use right out of the bag, while the Boomr Bag is noted as hydrated to field capacity. You should still inspect for dry corners or excess pooling and always mix in clean conditions with fully colonized spawn for best consistency.
How many substrate bags do I need per grain spawn bag?
North Spore gives explicit guidance to mix 1 colonized grain spawn bag with 2 to 3 Boomr Bags, so most monotub runs need multiple 5 lb units for correct depth. The 10 LB cow CVG bag is positioned to fill a monotub or receive grain directly, so one bag can cover a larger single run depending on your tub depth and spawn vigor. When in doubt, start with the higher inoculation rate and keep notes on colonization speed for your next run.
Write Your Review
No reviews yet. Be the first to share your experience!