If you are deciding between Legigo 10Pack Organic Coco Coir Brick for Plants and Myco Labs Premium Bulk Mushroom Substrate Mix for your next spawn to bulk run, you are really deciding between plain coco coir and a formulated mushroom substrate. This coco coir substrate for mushroom vs Mushy Substrates comparison focuses on that exact trade off, DIY control and bulk volume on one side versus premixed nutrition and ready to use convenience on the other.
Updated November 2026, we assessed specs, hydration methods, batch sizes and user ratings across five options to keep this practical for monotub growers. You will also see references to Boomer Shroomer Dry Bulk Substrate for Mushroom, 5 LBS Coco Mushroom Substrate with Added Cow and 10 LBS Coco Mushroom Substrate with Added Cow because they represent the middle ground between dry CVG and manure enriched bags. For broader background, browse the Substrate, CVG and Bulk Amendments archive.
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Quick Picks at a Glance
Prime Boomer Shroomer CVG Mushroom Substrate
Prime SGM LABS 5 LB Coco Mushroom Substrate with Cow
Prime SGM LABS 10 LB Coco Mushroom Substrate CVG
Prime Legigo 10 Pack Organic Coco Coir Bricks
Prime Myco Labs Premium 5 LB Pasteurized Bulk Mushroom
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Pros
- Balanced CVG blend designed specifically for mushroom cultivation
- Excellent moisture retention with added aeration from vermiculite
- Large yield covers two monotubs from one bag
- Easy to store dry mix with long shelf life
Cons
- Requires boiling water, a 5 gallon bucket and a 24 hour pasteurization wait
- Bucket and other prep supplies are not included
- Fixed blend ratio offers less customization for advanced recipes
The Boomer Shroomer Dry Bulk Substrate is a ready to mix CVG blend of coco coir, vermiculite and gypsum for mushroom cultivation. It is built for hobby mycologists and beginners doing spawn to bulk transfers in monotubs, trays or filter bags.
In use, you simply add 16 cups of boiling water in a 5 gallon bucket and let it pasteurize for 24 hours to reach field capacity. The hydrated mix delivers about 9 lbs of airy, moisture retentive substrate that supports fast colonization and multiple flushes.
The ingredient quality stands out, with coco coir for water holding, vermiculite for aeration and gypsum for pH stability. The dry format keeps everything fresh in storage, lightweight to handle, and less prone to contamination than pre hydrated products.
The main tradeoff is prep time, since you need boiling water, a bucket and a full day wait before use. Growers who want instant ready to use substrate or custom ratios will need to look elsewhere or adjust on their own.
Overall, this is a reliable, beginner friendly bulk substrate that simplifies monotub growing without sacrificing performance. If you want a consistent CVG base for two full tubs, it is an easy recommendation.
Brand: Boomer Shroomer, Model: BSBULK001, Type: Dry CVG bulk substrate. Includes 500g coco coir, 500g vermiculite and 100g gypsum.
Hydrated yield is about 9 lbs, enough for two monotubs. Dry weight is 1.15 kg with a 5 gallon prep volume using bucket tek.
Add the dry mix to a clean 5 gallon bucket, pour in 16 cups of boiling water, seal and let pasteurize for 24 hours. Check for field capacity where the mix holds moisture without dripping.
Mix with fully colonized grain spawn for spawn to bulk transfer in monotubs, trays or bags. Maintain proper humidity and fresh air exchange for colonization and fruiting.
Pros
- Fast colonization reported by beginners and experienced growers
- Clean performance with strong contamination resistance
- Holds moisture well without need for rehydration
- Truly ready to use right out of the bag
- Works for multiple methods including monotubs and in bag grows
Cons
- 5 LB size may require multiple bags for large monotubs or bulk runs
- Pre-hydrated format is heavier and bulkier to store than dry coir bricks
- Natural manure based mix may have an earthy odor during setup
The SGM LABS 5 LB Cow Coco Substrate is a pre-hydrated CVG blend made with coco coir, cow manure, vermiculite and gypsum. It is built for first time growers, hobbyists and bulk cultivators who want a ready to use fruiting substrate without mixing their own.
In real world use, it stands out for fast colonization and reliable fruiting performance in monotubs and grow in bag setups. Reviewers consistently note clean runs with strong moisture retention, often reporting no need to mist again after spawning.
The substrate arrives pre-hydrated in a 0.2 micron filter bag that allows gas exchange while limiting contaminants. Each bag includes a production date and batch number sticker, which adds confidence in freshness and small batch quality control.
The main tradeoff is size and format, since larger tubs will need multiple bags and the pre-hydrated weight is bulkier than dry coir bricks. The manure enriched formula can also have a natural earthy smell during setup.
Overall, this is an excellent plug and play substrate for growers who value convenience, consistency and yield. If you want to skip pasteurizing and mixing and get straight to spawning, it is a smart, dependable choice.
Brand: SGM LABS, Model Number: 5lbcowcocosubstrate, Item Type: cowcoco, Style: Modern.
Unit Count: 80 Fluid Ounces, Item Weight: 5 pounds, Volume: 6.54 quarts.
Mix: Coco coir, cow manure, vermiculite and gypsum in a pre-hydrated 0.2 micron filter bag for monotub, casing or in bag growing.
Use this substrate straight from the bag with no mixing or hydrating required. Simply dump into a clean monotub or spawn your colonized grain directly into the CVG bag.
Maintain proper fresh air exchange and stable temperatures during colonization and fruiting. The pre-hydrated formula is designed to hold moisture, so avoid over misting early on.
For best results, keep your work area clean during transfer and follow standard spawn to substrate ratios. Store unopened bags in a cool, dry place and check the batch date sticker for freshness.
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
- Expands quickly into a large volume of soft, workable soil from compact bricks
- Excellent water retention with good drainage for consistent root moisture
- Organic, biodegradable and pH balanced for sensitive seedlings and indoor plants
- Compact and lightweight for easy storage compared to bulky bags of potting mix
Cons
- Requires soaking and breaking apart before use, so it is not ready to plant straight from the brick
- Low natural nutrients means you may need to add fertilizer for heavy feeding plants
- Hydrating and mixing can be dusty and messy
The Legigo 10 Pack Organic Coco Coir Bricks are compressed coconut husk fiber bricks designed as a natural alternative to potting soil. Each compact brick expands with water into a soft growing medium, making them ideal for seed starters, container gardeners and indoor plant lovers.
In use, the coir fluffs up into a light, spongy mix that holds moisture while letting excess water drain away. Plants stay evenly moist in hot conditions, and the airy structure encourages strong root growth for vegetables, herbs, flowers and microgreens.
Each brick measures about 8 x 4 x 2 inches and weighs around 1.4 lb, so the 10 pack stores neatly without the bulk of large soil bags. The fiber is clean, low EC and pH balanced, and it blends easily with compost, perlite or traditional potting mix for custom blends.
You will need to hydrate and fluff each brick before planting, which takes extra prep time and can be a bit messy. Because coir is naturally low in nutrients, heavy feeders will still need regular fertilizing, and you should hydrate slowly to get your preferred consistency.
For gardeners wanting a sustainable, reusable and versatile growing medium, this 10 pack offers great value and performance. It is especially useful if you start lots of seeds, maintain containers or want to improve aeration and moisture control in your soil mix.
Brand: Legigo, Model: LG-Coco Bricks-10set
Count: 10 compressed coco coir bricks, about 1.4 lb each
Brick Size: 8 x 4 x 2 inches, expands with water into fluffy growing medium
Material: 100 percent organic coconut coir fiber, low EC, pH balanced and biodegradable
Best Use: Seed starting, potting mix, container gardens, raised beds, microgreens, compost and reptile bedding
Place a brick in a large container and add water slowly, allowing the fiber to absorb and expand fully.
Break apart and fluff with your hands or a trowel until you reach a soft, even consistency.
Mix with potting soil, compost or perlite if desired, then fill pots, trays or beds and plant as usual.
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.
How They Compare
Ingredients and Nutrition: Plain Coir Versus CVG Plus Manure and Minerals
Legigo 10Pack Organic Coco Coir Brick for Plants is 100 percent organic coconut coir described as low EC and pH balanced, made from fiber extracted from coconut husks. It contains no vermiculite, gypsum, manure or added minerals, so you get clean water holding fiber that is light, airy and reusable. That simplicity is useful if you want to build your own recipe, but it means you must supply all structure, pH buffering and nutrition yourself.
Myco Labs Premium Bulk Mushroom Substrate Mix takes the opposite approach with a pasteurized bulk mix designed for dung and grain loving mushrooms, finished with a calcium mineral blend to hold pH in a range that favors mycelium. Boomer Shroomer Dry Bulk Substrate for Mushroom follows the classic CVG formula with 500g coco coir, 500g vermiculite and 100g gypsum for aeration and pH stability. Both SGM LABS options go a step further with coco coir, cow manure, vermiculite and gypsum, which growers commonly report can support vigorous colonization and heavier first and second flushes when paired with healthy grain spawn.
Prep Time, Hydration and Pasteurization Workflow
With Legigo 10Pack Organic Coco Coir Brick for Plants, each brick measures about 8 x 4 x 2 inches and weighs approximately 1.4 lb before hydration, and you expand it rapidly after adding water. You control how wet it gets, which is helpful for casing or mixing with other soils, yet for mushrooms you still need to bucket pasteurize, squeeze to field capacity and often add vermiculite and gypsum separately. If you enjoy dialing in moisture by feel and you already own a 5-gallon bucket and thermometer, you will like the flexibility, but you should plan extra time and cleanup.
Boomer Shroomer Dry Bulk Substrate for Mushroom keeps DIY pasteurization but removes measuring guesswork by directing you to hydrate the dry mix in a 5-gallon bucket using 16 cups of boiling water, then pasteurize for 24 hours to reach optimal field capacity. Myco Labs Premium Bulk Mushroom Substrate Mix, 5 LBS Coco Mushroom Substrate with Added Cow and 10 LBS Coco Mushroom Substrate with Added Cow arrive pre hydrated and pasteurized or sterilized in a 0.2 micron bag, ready to dump into a monotub or to receive grain directly. If you grow in a small apartment or want to inoculate the same day your spawn is ready, that ready to use format saves you a full day of prep.
Yield, Batch Size and Storage for Monotubs
Volume is where plain bricks shine for large or repeated projects. Ten compressed bricks store compactly, stay stable dry for a long period and can be reused in garden beds, microgreens, reptile bedding or potting mixes if you hydrate too much. The trade off is that usable mushroom volume depends on how much water you add and what amendments you blend in, so you need experience to hit consistent depth across trays. Check the bulk substrate guides if you are still learning how deep to fill monotubs for proper moisture reserve.
Formulated bags state yield more directly for mushroom growers. Boomer Shroomer Dry Bulk Substrate for Mushroom makes about 9 lbs of hydrated bulk substrate, described as enough for two full monotub grows or other fruiting setups. The SGM LABS line gives you a clear choice between 5 LBS Coco Mushroom Substrate with Added Cow for a single tub or small bag grow and 10 LBS Coco Mushroom Substrate with Added Cow for two tubs or a large monotub with deeper substrate. Myco Labs Premium Bulk Mushroom Substrate Mix in the 5 LBS bag fits a standard spawn to bulk ratio for one tub, so you can scale by buying two bags rather than storing buckets and dry ingredients.
Consistency, Contamination Pressure and Beginner Friendliness
Plain coir is naturally low in nutrition, which can mean slower competitor growth if your pasteurization and sterile handling are solid, but it is not sterile and pH can drift without gypsum or calcium. Legigo 10Pack Organic Coco Coir Brick for Plants is rated 4.4 out of 5 from 2346 reviews, yet those ratings reflect plant, garden and bedding use rather than mushroom specific results. You should expect more variability in colonization speed and flush size unless you carefully buffer, hydrate and mix spawn evenly.
Enriched mushroom mixes aim for repeatability with pasteurization that preserves beneficial nutrients while reducing competitors, plus mineral buffering for stable pH. Myco Labs Premium Bulk Mushroom Substrate Mix is rated 4.3 out of 5 from 348 reviews, 5 LBS Coco Mushroom Substrate with Added Cow is rated 4.6 out of 5 from 100 reviews, 10 LBS Coco Mushroom Substrate with Added Cow is rated 4.5 out of 5 from 132 reviews, and Boomer Shroomer Dry Bulk Substrate for Mushroom is rated 4.7 out of 5. The cons are real too, manure enriched bags can carry odor, dry CVG still requires careful handling of boiling water, and any nutrient rich substrate will show mistakes in spawn quality or room hygiene faster than plain coir. See the substrate category overview for how these formats fit different monotub, tray and bag methods.
Which One Should You Get
Choose Legigo 10Pack Organic Coco Coir Brick for Plants if you want maximum volume and flexibility, you already mix your own CVG, and you are comfortable with bucket pasteurization and field capacity checks. You are a good match if you run multiple tubs, trays and garden projects from one purchase, you have dry storage, and you prefer to control ratios of coir, vermiculite and gypsum yourself rather than pay for water weight and premixed manure. Just plan to buy amendments separately and accept that your first few hydrations may need adjustment.
Choose Myco Labs Premium Bulk Mushroom Substrate Mix if you want the shortest path from colonized grain to bulk with pre hydrated, pasteurized substrate at field capacity. You are a good match if this is your first or second monotub, you grow dung loving varieties in a monotub or filter bag, and you prefer to open a 5 LBS bag and mix rather than boil water and wait 24 hours. If you prefer dry storage, pick Boomer Shroomer Dry Bulk Substrate for Mushroom instead, and if you specifically want cow manure nutrition, pick 5 LBS Coco Mushroom Substrate with Added Cow for one tub or 10 LBS Coco Mushroom Substrate with Added Cow for a double tub run.
Who Should Skip Both
If you produce your own grain spawn, agar cultures or liquid culture for sale, or you grow wood loving species on hardwood, sawdust or logs, these coco based bulk mixes are not ideal for your core workflow. They are also not a good fit if you need fully sterile laboratory substrate, automated commercial throughput, or outdoor bed compost, where species specific wood or composted manure systems will serve you better than a general monotub CVG.
Frequently Asked Questions
Can I use plain coco coir bricks for mushrooms without adding vermiculite and gypsum?
You can fruit on plain hydrated coir, but you will get better moisture retention with vermiculite and more stable pH with gypsum or calcium minerals. For consistent monotubs, most growers prefer a full CVG style blend like Boomer Shroomer Dry Bulk Substrate for Mushroom rather than coir alone. Always pasteurize plant grade bricks before spawn to bulk contact.
Is pre hydrated mushroom substrate better than a dry CVG mix I hydrate myself?
Neither format is universally better, they solve different problems for different growers. Pre hydrated bags like Myco Labs Premium Bulk Mushroom Substrate Mix and the SGM LABS cow coir bags save a day of prep and arrive near field capacity. Dry mixes store longer, ship lighter and let you control water with 16 cups of boiling water in a 5-gallon bucket as directed.
How much substrate do I need for two monotubs?
For two standard monotubs, one dry kit that makes about 9 lbs of hydrated substrate is often enough, which is the stated yield for Boomer Shroomer Dry Bulk Substrate for Mushroom. If you buy pre hydrated bags, plan on about 5 LBS per monotub, so choose 10 LBS Coco Mushroom Substrate with Added Cow or two 5 LBS bags. Deeper substrate holds moisture longer, so adjust spawn ratio rather than spreading one bag too thin.
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