Midwest's Black Cow Manure Substrate & Casing Mix - 5 lbs – Midwest Grow Kits

Free shipping on orders over $99

Phone Support (M-F) 11am to 5pm CST

SPRING SALE ENDS SUNDAY 4/26 SAVE 11% WITH CODE: SPRING11

Midwest's Black Cow Manure Substrate & Casing Mix - 5 lbs

(54)
$2000 $2500
Taxes, discounts and shipping calculated at checkout.
Fully hydrated 5 lb Black Cow Manure Casing Mix made from composted grain-fed cow manure, coir, and minerals. Ideal for bulk mushroom grows and Monotub setups.

🔥 678 purchased in the last 30 days
⭐ 10,000+ units sold

Description

Midwest’s Black Cow Manure Based Bulk Substrate & Casing Mix – 5 lbs

Ready-to-Use • Fully Hydrated • Ultra-Composted • Ideal for Bulk Grows & Monotubs

Take your bulk grows to the next level with Midwest’s Black Cow Manure Based Bulk Substrate, a premium 5 lb blend made with ultra-composted dairy cow manure and carefully balanced ingredients for strong, consistent performance. This ready-to-use manure substrate arrives fully hydrated and properly balanced, making it an excellent choice for monotubs, trays, and other bulk growing methods.

Designed for growers looking for a rich, high-performance bulk substrate, this blend combines moisture retention, structure, and balanced pH support in one convenient bag. Simply mix with fully colonized grain spawn and you’re ready to go—no extra prep, no messy mixing, and no guesswork.

Midwest Black Cow manure based bulk substrate 5 lb bag


Why Growers Choose Black Cow

  • Manure-Based Bulk Substrate – Made with ultra-composted dairy cow manure for growers who prefer a traditional manure-based bulk mix.
  • Ready to Use – Fully hydrated and sealed for convenience, so you can go straight from colonized grain spawn to bulk mixing.
  • Balanced for Performance – Formulated to provide the moisture, texture, and pH support needed for strong colonization and reliable bulk growing.
  • Built for Monotubs & Trays – Ideal for monotubs, grow trays, and other bulk fruiting containers.
  • Consistent Texture & Moisture – Carefully blended for even mixing and dependable results from bag to bag.

Premium Formula

Our Black Cow substrate blend is built for consistency and ease of use, combining moisture-retaining materials with pH-balancing minerals for a dependable bulk substrate you can trust.

  • Ultra-composted dairy cow manure
  • Coco coir
  • Vermiculite
  • Spring water
  • Gypsum & hydrated lime
  • Mineral buffer blend including calcium, magnesium, and sodium bicarbonate

How to Use It

For best results, mix your fully colonized grain spawn evenly into the substrate and place it into your monotub, tray, or bulk grow container. Allow the mixture to colonize before introducing fruiting conditions.

This 5 lb bag is a convenient size for smaller bulk grows and works especially well with grain spawn bags and colonized jars.


Recommended Usage

  • 1 to 1.5 grain spawn bags per 5 lb bag
  • About 3 quick-colonizing 24 oz jars per bag
  • About 6 half-pint jars per bag

Real Results Using Black Cow

See what growers can achieve using Midwest’s Black Cow Manure Based Bulk Substrate in monotub and bulk grow setups.

Real results using Midwest Black Cow manure based bulk substrate in monotubs


Storage & Shelf Life

  • Store sealed in a cool, dry place
  • Best used within 45 days when stored at room temperature
  • Do not freeze

Ideal For

  • Monotub grows
  • Bulk trays and fruiting chambers
  • Growers using rye, 5-grain, or grain jars
  • Anyone looking for a ready-to-use manure-based substrate