House & Garden Cocos A, 1000 L

A Base Nutrient Formulated for Coco Coir's Cation Exchange, Part A 1000 L

Coco coir behaves differently from rockwool, clay pebbles, or soil because of its cation-exchange capacity — it naturally holds onto calcium and magnesium and releases potassium and sodium in their place, which means a base nutrient built for another medium can leave a coco coir planting short on calcium and magnesium over time. House & Garden Cocos is a two-part base nutrient formulated specifically to account for that exchange, with Part A designed to be mixed in equal amounts with Part B rather than used on its own.

This 1000 L bottle of Part A is sized for a large commercial or industrial-scale coco coir operation. Mix it in equal parts with Cocos Part B directly in the reservoir, never combining the two concentrates before they hit the water.

Key Features & Benefits

• Part A of a two-part system — formulated to be mixed in equal amounts with Cocos Part B
• Formulated for coco coir's cation-exchange capacity — accounts for how coco coir holds and releases calcium, magnesium, potassium, and sodium differently than other media
• Built specifically for coco coir growing — distinct from House & Garden's Aqua Flakes line, which targets recirculating hydroponic media instead
• Available in 1000 L — sized to match the scale of the operation using it

Who Should Use Cocos Part A

Growers running coco coir as their primary growing medium, in containers or grow bags, who need a base nutrient matched to coco's cation-exchange behavior will use Cocos Part A together with Part B as their core feeding program.

About House & Garden

House & Garden is a nutrient and additive brand established in 1990 by William Van De Zwaan, whose family had a background in Dutch horticultural glasshouse production; the company formulates its base nutrients and additives in small batches, filtering its process water through multi-stage ceramic filtration. Hydrofarm acquired House & Garden in 2021, and the brand's manufacturing and research operations are based in Humboldt County, California, building a product line of base nutrient systems and root, flowering, and growth additives sold to growers in dozens of countries.

Frequently Asked Questions

How do I mix Cocos Part A and Part B?

Add equal amounts of Part A and Part B directly to your feed water, mixing thoroughly between additions. Never combine the two concentrates together before they reach the water, since mixing them at full strength can cause nutrient lockout.

Can I use Part A or Part B on its own?

No. Cocos is formulated as a two-part system, and Part A is not a complete feed by itself — it needs to be used together with Part B in equal amounts to supply a full range of macro and trace elements.

Why does coco coir need a different base nutrient than hydroponic media?

Coco coir has a natural cation-exchange capacity, meaning it holds onto calcium and magnesium while releasing potassium and sodium in their place. A base nutrient that doesn't account for that exchange can leave a coco coir planting short on calcium and magnesium over time, which is why Cocos is formulated specifically for coco coir rather than reused from a hydroponic-media formula.

How do I know how much to use?

Use an EC/PPM meter to measure your feed water after mixing and adjust the amount of Cocos added until you reach your target nutrient strength for the current growth stage. Follow label directions for a starting dose, then fine-tune from there.

Can I use Cocos in a hydroponic system instead of coco coir?

Cocos is formulated specifically for coco coir's cation-exchange behavior, so it's not the right choice for a recirculating hydroponic system without that medium. House & Garden's Aqua Flakes line is built for recirculating hydroponic applications like ebb and flow and DWC instead.