Advanced Nutrients Sensi Coco Grow A&B — Two-Part Coco-Specific Base Nutrient
Best for: Growers running coco coir who want a purpose-built nutrient system that accounts for coco's calcium and magnesium binding without needing separate Cal-Mag.
Our thoughts
This is genuinely engineered for coco, not just a standard nutrient slapped with a label. The iron chelation and integrated surfactant matter. What matters more is that you understand how coco works — it binds calcium and magnesium differently to other media, and this formula accounts for that from the start. If you're new to coco and want one less thing to worry about, worth considering.
Advanced Nutrients Sensi Coco Grow A&B is a specialist two-part liquid nutrient designed specifically for growing in coco coir. Most standard nutrients don't account for coco's natural chemistry — coco naturally binds calcium and magnesium, pulling them away from your plants where they're needed. Sensi Coco Grow A&B fixes that by increasing chelated calcium and magnesium, whilst lowering potassium to offset what's already naturally present in coco. It also includes integrated iron in multiple chelated forms, a surfactant for better substrate wetting, and Advanced Nutrients' proprietary pH Perfect technology. This is a proper all-in-one system for coco growing.
How it compares
This sits at the premium end of the two-part coco nutrient market.
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vs Canna Coco A+B: Similar coco-specific formulation; Canna requires separate Cal-Mag purchase; Sensi includes iron and surfactant built in; Canna has stronger heritage, Sensi has newer chemistry
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vs General Hydroponics Flora + Cal-Mag: GH is cheaper and more flexible; Sensi is purpose-built for coco only; GH requires manual pH adjustment; Sensi includes pH Perfect technology
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vs SHOGUN Samurai Coco: Both premium and innovation-focused; SHOGUN adds biostimulants; Sensi focuses on chelation and iron
In practice: Sensi Coco is more expensive per litre than budget systems, but you're paying for coco-specific chemistry rather than guessing with a generic nutrient.
Usage guidance
Sensi Coco Grow A&B is designed for the vegetative growth phase in hydroponic systems — drip irrigation, aeroponics, NFT, flood and drain, and deep water culture all work well.
Basic mixing
Mix at a rate of 4ml per litre of nutrient solution (Part A and Part B equally). Always add Part A first, mix thoroughly, then add Part B. Never mix the concentrate parts together. Use an EC metre to track nutrient strength — not essential but highly recommended for consistency.
Typical feeding schedule (vegetative phase)
Week 1: 1ml/litre each (Part A and B)
Week 2: 2ml/litre each
Week 3: 3ml/litre each
Work up to full strength (4ml/litre) as plants establish. Target EC range: 0.5–1.2 depending on plant maturity.
Important: Water type matters
pH Perfect technology works best with low-EC water (reverse osmosis or rainwater). If you're using tap water with higher mineral content, the pH stabilisation won't work as reliably. The formula also produces higher salinity than some competitors — some growers find they need to dose lower than the label suggests.
Advanced Nutrients compatibility
pH Perfect only works properly when you use Advanced Nutrients boosters and additives. Mixing in other brands' supplements will stop the pH technology functioning. If you're mixing brands, treat it like a standard nutrient and manage pH manually.
Technical specifications
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Format: Two-part liquid concentrate system
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Part A NPK ratio: 3-0-0
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Part B NPK ratio: 1-2-4
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Key additives: Chelated calcium (amino acid complex and nitrate forms), chelated magnesium (amino acid complex and nitrate forms), multiple chelated iron forms (DTPA, EDDHA, EDTA), chelated manganese
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Surfactant: Wet Betty included (reduces water surface tension for better substrate penetration)
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Additional: Humic acids derived from leonardite
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Application rate: 4ml per litre (Part A + Part B)
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Target EC range: 0.5–1.4 mS/cm (rooted cuttings to pre-flower)
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pH stability: Maintains optimal nutrient uptake pH for one week when used as directed with low-EC water
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Technology: pH Perfect automatic pH adjustment (requires RO/low-EC water and Advanced Nutrients additives for optimal function)
Who this is for
- Growers running coco coir who want a nutrient specifically engineered for the medium
- Hydroponic growers using drip, aeroponics, NFT, or DWC systems with coco
- Experienced coco growers wanting to eliminate calcium and magnesium deficiency risk
- Growers seeking an all-in-one system that includes iron and surfactant without buying separately
- Nutrient minimalists who want to commit to one brand's ecosystem (Advanced Nutrients)
Less suited to growers using mains tap water with high mineral content, or those mixing nutrients from different manufacturers.
Our take
This is properly engineered for coco. The iron inclusion and surfactant are genuine additions you don't get in every competitor product. The formula addresses actual coco chemistry — the calcium and magnesium binding problem is real, and accounting for it from the start saves headaches later.
The trade-off is cost and commitment. You're paying a premium, and the pH Perfect technology only delivers if you use RO water and stick with Advanced Nutrients across the board. If you're new to coco and want simplicity, or if you've had calcium or iron issues in the past, worth picking up. Good time to buy while stock lasts.
