House & Garden Coco A&B — Concentrated Two-Part Base Nutrient for Coco Growing
Best for: Growers using coco coir who want a properly balanced, all-in-one nutrient system that works from veg through to flower
Our thoughts
This is serious nutrient kit. House & Garden's Coco A&B is properly concentrated — meaning it lasts longer per bottle than most competitors — and it handles coco's quirks without faffing about. Designed for coco specifically, which means you get the calcium and magnesium balance right out of the tin. One growers come back for.
House & Garden Coco A&B is a two-part liquid base nutrient system formulated specifically for plants grown in coco coir. Unlike generic hydroponic feeds, this is built around coco's unique characteristics — it accounts for how coco binds calcium and magnesium, and delivers all the main nutrients your plants need to thrive from seedling through to the end of flowering, using only pharmaceutical-grade ingredients with zero bulking agents or filler.
The system comes as Part A and Part B, which must be added separately to your water (in that order) to avoid chemical reaction and sediment. It's highly concentrated, meaning a little goes a long way, and it works just as well in hand-fed pots as it does in automated drip or recirculating systems.
How it compares
House & Garden Coco sits in the quality-focused, mid-premium tier of two-part coco nutrients.
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Vs. CANNA Coco: Similar formulation philosophy and price point. Both are two-part coco-specific systems; CANNA has longer market history, H&G edges on concentration and value
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Vs. Advanced Nutrients Sensi Coco: Advanced sits higher-priced with pH-buffering tech. Real-world results are broadly similar; the pH automation is convenience, not essential
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Vs. Terra Aquatica DualPart: Terra claims to be all-in-one (no Cal-Mag needed). H&G is more flexible — works standalone or with boosters depending on your setup
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Vs. generic hydro feeds: Those work in coco, but they don't account for cation exchange — you'll often need to add separate calcium and magnesium. This does it properly from the start
Usage guidance
House & Garden Coco A&B is straightforward once you follow the mixing order. Get that wrong and you'll get sediment; get it right and you've got clean, stable nutrition.
Mixing (critical step)
Fill your tank two-thirds with water, add Part A and circulate well, then add Part B. Never add both at once — they'll react. Adjust pH to 5.8–6.3 after mixing. Then add any boosters if you're using them.
Dosage
Use 1–2ml of each part per litre of feed water (so 1ml Part A + 1ml Part B per litre). This gives you an EC of around 1.2 at the start of vegetative growth. Follow the growth schedule, building up to an EC of around 2.0 by the end of flowering.
Hand-feeding pots
Works perfectly. Mix your feed, check pH, and water to light runoff. Let the coco dry to roughly half weight between feeds.
Automated systems (drip, flood, recirculating)
Run-to-waste setups are cleanest. In recirculating systems, monitor EC and pH regularly — coco is inert, so the nutrient solution won't buffer over time the way soil does.
Throughout the cycle
This is an all-in-one base feed — no need to swap formulas between veg and flower. Just follow the dosing schedule. If you want to push growth or flowering, add House & Garden boosters (Roots Excelurator, Bud XL, Multi Zyme) alongside it.
Technical specifications
- Format: Liquid, two-part system (Part A and Part B)
- Part A NPK ratio: 0.3 - 0 - 0.3
- Part B NPK ratio: 0.1 - 0.3 - 0.6
- Composition: 100% liquid base elements; no bulking agents
- Key ingredients: Calcium nitrate, ammonium nitrate, potassium hydroxide, Eddha-Fe (chelated iron), humic and fulvic acids
- Purity: Pharmaceutical-grade; no dyes, synthetic plant growth regulators, or detectable heavy metals
- Optimal pH range: 5.8–6.3
- Concentration: Highly concentrated; 1ml Part A + 1ml Part B per litre of water for standard dosing
- Storage: Keep sealed, store between 7–29°C, use within one year of opening
- Available sizes: 1L (and larger options)
Who this is for
- Growers committed to coco coir who want a system built specifically for that substrate
- Anyone stepping up from generic hydroponic nutrients and getting tired of dealing with calcium-magnesium deficiencies
- Serious growers who value concentration and cost-per-litre over volume — this lasts longer
- Operators running multiple pots or rooms where nutrient costs stack up; concentrated feeds make sense
- Growers who like flexibility — works in any system, plays nicely with boosters, doesn't force you into an expensive add-on ecosystem
Our take
House & Garden Coco A&B is proper nutrient kit at a fair price. It's concentrated, it's built for coco, and it doesn't mess about with unnecessary complexity. You mix it right, follow a sensible dosing schedule, and your plants get what they need.
The two-part system sounds like a faff, but it's actually why it works — the formulation is clean and stable because A and B don't conflict until they're in the water. Real growers understand why that matters.
If you're running coco and want reliable nutrition without overpaying for brand hype or dealing with deficiencies, worth picking up. Good time to buy while stock lasts.
