House & Garden Cocos A – 5 Liter

House & Garden Cocos A is part of the two-part Cocos A&B nutrient system, formulated specifically for coco coir as a growing medium. Unlike soil or standard hydroponic nutrients, Cocos A&B accounts for the cation-exchange capacity of coir, delivering a balanced mineral profile suited to coco’s distinct buffering behaviour. Available in a 5-liter bottle (SKU: HGCOA05L) for mid-scale and commercial grow operations.

House & Garden Cocos A – 5 Liter Specifications

Core product data for House & Garden Cocos A in the 5-liter size. Part A is used in combination with Cocos B throughout the grow and bloom cycle.

Why Choose House & Garden Cocos A

Coco coir is chemically active in ways that standard soil or rockwool is not. Its cation-exchange sites preferentially bind certain positively charged mineral ions — particularly calcium and magnesium — before releasing them back to the root zone. A nutrient formula designed for soil will not account for this, and growers often see deficiency symptoms even when the feed chart looks correct.

House & Garden Cocos A&B is built around this reality. The formulation adjusts the mineral ratios so the plant receives what it needs at the root, after the coir’s exchange sites have had their effect. Used as a matched pair, Cocos A and Cocos B together provide a complete base nutrient feed across both vegetative and bloom stages without requiring constant additive corrections.

• Mineral ratios calibrated for the cation-exchange capacity of coco coir — not a re-labelled soil formula
• Two-part system keeps incompatible minerals separated until they reach the reservoir, improving stability and shelf life
• Compatible with House & Garden’s full additive line, including the brand’s published nutrient schedule
• 5-liter bottle size suits commercial cycles and reduces per-cycle packaging waste compared to 1-liter bottles
• House & Garden publishes a nutrient calculator on their website to help dial in the correct dose per week and growth stage

Best Uses for House & Garden Cocos A

Cocos A is intended as the Part A base nutrient for any crop grown in coco coir, loose or in a bag. It works across drain-to-waste and recirculating coco systems. The following scenarios represent the most common fits:

• Coco coir drain-to-waste: Mix Parts A and B separately into your base water before combining, then feed to run-off at each irrigation event throughout the grow and bloom phases.
• Recirculating coco (RDWC or recirculating drip): Add to reservoir at the recommended dose per litre; monitor EC and top-up as the reservoir drops.
• Commercial multi-light rooms: The 5-liter bottle reduces the number of containers to manage per batch, keeping the feed room organised during large runs.
• Growers following the House & Garden schedule: Cocos A is specifically referenced in the brand’s nutrient calculator, making it straightforward to integrate with H&G’s published weekly feed chart.
• Transitioning from soil: Growers switching to coco from soil benefit from a purpose-built formula rather than trying to compensate a soil nutrient’s mineral gaps with additional calcium-magnesium supplements.

If you are also using root-zone inoculants in your coco system, pairing Cocos A&B with a microbial product such as Advanced Nutrients Tarantula can support root colonisation alongside the base nutrient programme. For root-zone conditioning additives, consider reviewing Heavy 16 Roots as a complement to your coco feed strategy.

Compatibility

House & Garden Cocos A is formulated for use with coco coir as the growing medium. It is not designed for use in soil, peat, rockwool, or inert hydroponic media such as clay pebbles or flood-and-drain tables where the medium contributes no cation exchange. Using it in those media will not harm the plant, but the specific mineral ratios intended to compensate for coir’s ion-binding behaviour will not be necessary.

The product must be used in combination with House & Garden Cocos B. Part A and Part B are formulated as a matched pair; using either part alone does not constitute a complete base nutrient. Do not mix Part A and Part B together in concentrated form — add each to your reservoir or dilution water separately before combining.

Cocos A is compatible with the full House & Garden additive and supplement line. Refer to the House & Garden nutrient calculator at house-garden.us for weekly dose rates when combining with additives such as Roots Excelurator, Drip Clean, or Top Booster.

Dosing Guidelines

House & Garden does not publish a fixed dose rate in the canonical product listing. Refer to the official nutrient schedule and calculator on the House & Garden website for the recommended ml-per-litre rate by growth stage, as dose varies across seedling, vegetative, early bloom, mid bloom, and late bloom phases.

General practice for two-part coco base nutrients:

• Measure Parts A and B in equal volumes using a calibrated syringe or graduated measuring cup.
• Add Part A to your water first, stir, then add Part B. Do not combine concentrates directly.
• Target a final pH of 5.8–6.2 for coco coir systems; adjust after mixing both parts.
• Verify EC is within the range appropriate for your crop’s growth stage before feeding.
• In drain-to-waste coco, feed to 10–20% run-off at each irrigation to prevent salt accumulation.

Sources & Further Reading