GROW!T Coco Coir Mix Brick Pack of 3

The GROW!T Coco Coir Mix Brick Pack of 3 provides three compressed bricks of coconut coir growing medium that expand on contact with water into a loose, fibrous substrate. Each brick yields 0.26–0.33 cu ft (2–2.5 gal) of wetted coir, making the pack a practical way to stock 6–7.5 gallons of ready-to-use growing medium. The coir is free from pathogens and weed seeds, and is approved for use in certified organic production systems.

GROW!T Coco Coir Mix Brick Specifications

Specifications are sourced from the canonical product listing and manufacturer documentation. Weight is recorded in compressed, pre-hydration state.

Specification	Value
Brand	GROW!T
SKU	JSCPB
Pack Quantity	3 compressed bricks
Expanded Volume Per Brick	0.26–0.33 cu ft (2–2.5 gal) wetted coir
Total Expanded Volume (Pack of 3)	~0.78–0.99 cu ft (~6–7.5 gal)
Format	Coco Coir Mix (also available in chip format)
Compressed Pack Weight	~4.95 lb
Pathogen & Seed Free	Yes
Organic Growing Compatible	Yes
Indoor / Outdoor Use	Both

Why Choose GROW!T Coco Coir Mix Bricks

Coco coir is a byproduct of coconut husk processing and functions as a soil-less growing substrate or a soil amendment. GROW!T’s compressed brick format addresses two practical problems growers face when buying loose coir: storage space and handling mess. The bricks are dense before hydration, making them straightforward to transport and store on a shelf until needed.

Once water is added, each brick expands to several times its compressed size and produces a fibrous, porous medium with a structure that simultaneously holds moisture and allows excess water to drain freely. This air-to-water balance is one of coco coir’s core advantages over dense potting soils that can become waterlogged, restrict root oxygen, and encourage root disease.

GROW!T sources this coir to be free from pathogens and weed seeds, so the expanded medium can be used directly in containers or seed trays without sterilization. The material is also suitable for certified organic growing programs, since it is a natural, minimally processed substrate with no synthetic additives.

• Compressed brick format is easy to store and carry before use — no bags of loose substrate to manage
• Each brick expands to 0.26–0.33 cu ft of aerated growing medium; a pack of 3 yields roughly 6–7.5 gallons
• Dual-action water retention and drainage properties reduce risk of root-zone waterlogging
• Free from pathogens and weed seeds — suitable for use straight from the brick without prior treatment
• Approved for organic production; no synthetic binders or added fertilizers
• Works both as a standalone substrate in containers and as an amendment blended into existing soil or potting mix

Best Uses for GROW!T Coco Coir Mix Bricks

Coco coir in brick form is a versatile medium. The following use cases reflect what the canonical product description states about how this product is intended to be used.

• Container gardening indoors or outdoors: Use expanded coir as the primary growing medium in pots, fabric containers, or planter boxes. It works in place of standard potting mix and is particularly useful where drainage is a priority. For container setups, consider pairing with 3-gallon fabric pots that complement coir’s drainage characteristics.
• Seed starting and propagation: Coir’s fine, consistent texture and pathogen-free status make it a practical option for seed germination trays and plug inserts. Its moisture retention keeps seeds evenly hydrated during germination without the risk of damping off from introduced pathogens.
• Blending into existing potting soil or native soil: Growers can mix expanded coir into denser soils to improve structure, increase drainage, and lighten the overall texture of a root-zone mix. It can be used as an alternative to bark as a soil amendment or ground cover material.
• Hydroponic and coco-specific nutrient programs: Coco coir is inert and does not contribute nutrients of its own, making it compatible with nutrient programs formulated specifically for coco substrates. Because coir has a known cation exchange capacity, growers using coco-specific nutrients can dial in their feed program predictably.
• Decorative ground cover: The material can be used in place of bark mulch as an all-natural ground cover, providing an organic aesthetic while retaining moisture around plant bases outdoors.
• Year-round growing cycles: The material is documented as suitable for protecting plants all year long, indoors and out, making it a practical substrate for growers who run continuous cycles rather than seasonal plantings.

Compatibility

Coco coir is a broadly compatible substrate that works with a wide range of container types, growing systems, and plant species.

Container types: GROW!T coco coir bricks are compatible with any container that allows drainage — plastic pots, fabric grow bags, ceramic planters, and raised beds. Fabric containers are a common pairing with coco because their side-aeration works well with coir’s drainage characteristics, preventing moisture pockets at the base.

Growing systems: Coco coir functions as a standalone medium in hand-watered containers, drip-irrigated systems, and recirculating coco-specific hydroponic setups. When used in recirculating systems, growers typically rinse and buffer the coir before first use to remove residual potassium and sodium — standard practice with coco substrate regardless of brand.

Nutrient programs: Because coir is pH-neutral to slightly acidic (typically 5.8–6.8 when wetted) and contains no added fertilizer, it is compatible with nutrient programs designed for coco, as well as general-purpose hydroponic and soil nutrients applied at appropriate rates. Organic liquid and granular nutrients are also compatible given the substrate’s certified organic suitability.

Mixing with other substrates: The expanded coir can be blended with perlite to further increase aeration, with composted amendments such as worm castings, or with pre-amended potting soils. It can also serve as a direct substitute for peat moss in recipes that call for it, since coir and peat perform similar structural roles.

Indoor and outdoor environments: The product is documented as suitable for both environments and provides year-round coverage. No specific temperature or humidity limitations are stated in the manufacturer documentation.

Usage Guidelines

Determining quantity: Each brick expands to 0.26–0.33 cu ft (approximately 2–2.5 gallons) of wetted coir. The full pack of 3 bricks produces roughly 0.78–0.99 cu ft, or 6–7.5 gallons of expanded medium. Hydrate only as many bricks as required; unexpanded bricks store dry until needed.

Hydration: Place one or more bricks in a large bucket. Add warm water gradually — typically 4–5 quarts per brick as a starting point — and allow the brick to absorb water and expand over 10–20 minutes. Break apart clumps with your hands or a trowel as the coir loosens. Continue adding small amounts of water until the expanded coir reaches a moist, crumbly consistency. Avoid over-saturating; excess standing water can be drained off.

pH and buffering (for hydroponic use): Target a pH of 5.8–6.5 for most hydroponic nutrient programs, or 6.0–6.8 for soil-based programs. Coir naturally contains elevated potassium and some sodium ions. For hydroponic use or when running coco-specific nutrient lines, pre-soak with a calcium-magnesium solution before planting. This pre-charges the coir’s cation exchange sites and prevents the substrate from stripping calcium and magnesium from the nutrient solution during early plant growth.

Filling containers: Once hydrated and prepared, fill your containers, trays, or beds with the expanded coir. If blending with perlite, a common ratio is 70% coir to 30% perlite by volume, which increases air porosity while maintaining moisture retention.

Watering frequency: Coco coir dries out more quickly than dense potting soils because of its superior drainage and aeration. Plants in coco typically need more frequent watering than plants in standard peat-based mixes, particularly in warm environments or under high-intensity lighting. Water when the top 1–2 inches of coir feel dry to the touch.

Reuse: Coco coir can be reused across multiple growing cycles if rinsed thoroughly to remove root material and flushed to reset salt buildup. Re-buffer with calcium-magnesium solution before replanting. Discard coir that has broken down to a fine, compacted texture that no longer drains freely.

Sources & Further Reading