Advanced Nutrients Sensi Coco Bloom A&B — pH Perfect Two-Part Coco Nutrient System
Best for: Growers running coco who want precision feeding without manual pH adjustment
Our thoughts
This is the nutrient system serious coco growers reach for. Sensi Coco Bloom is formulated specifically for the bloom phase in coco coir, accounts for what coco already contains, and its pH Perfect technology genuinely removes the pH guesswork. Not cheap, but it works, and it's popular for a reason.
Advanced Nutrients Sensi Coco Bloom A&B is a two-part base nutrient designed specifically for the bloom phase in coco coir. This isn't a universal hydroponic formula adapted for coco — it's built from the ground up for how coco actually behaves. The formula raises calcium and magnesium (which coco binds) while lowering potassium (which coco already contains in abundance), preventing lock-out before it starts. It also includes triple chelation: calcium, magnesium, and iron all in forms your plants can actually absorb.
The real party trick is pH Perfect technology. As long as your water sits between 4.5 and 8.5 pH (basically everyone's water), the nutrient automatically buffers and stabilises it for you. No metering, no second-guessing, no mid-feed pH crashes. That's a genuine time-saver if you're using RO water or anything remotely soft.
How it compares
In the coco-specific nutrient space, Sensi Coco Bloom occupies the premium-to-mid tier.
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vs General Hydroponics Flora + CalMag: GH is cheaper (often 30-50% less), works fine, but you're manually pH-ing and buying extra supplements. Sensi is convenience over lowest cost.
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vs Canna Coco A+B: Canna is similarly priced and equally proven. Both require supplemental cal-mag. Canna has a longer track record; Sensi has the iron chelation advantage and pH Perfect.
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vs Shogun Samurai Coco: Shogun's newer, includes yield-boosting additives, but hasn't got the decade-plus user base Sensi has.
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Advantage over all: Triple iron chelation — most coco nutrients skip iron entirely. That matters more than marketing suggests.
Usage guidance
Basic feeding protocol
Sensi Coco Bloom is a straightforward two-part system. Add Part A to your water first, mix well, then add Part B in equal volumes. The research suggests growers often run it at half strength (around 2mL/L) to avoid nutrient burn, though Advanced Nutrients recommend 4mL/L. Start conservative and adjust upwards if your plants are hungry.
With RO or soft water
This is where Sensi shines. If you're running reverse osmosis or rainwater, pH Perfect does the heavy lifting. No meter needed. Your water hits 4.5–8.5 pH, you mix the nutrients, and the formula self-regulates. This is not a gimmick — it genuinely works and removes one major stress point.
Feeding schedule
Run a daily feed until you see 25% runoff. Start cuttings and seedlings at low dose (1mL/L or lower), gradually increase over the first 3 weeks, then run your working dose through bloom. Most users switch straight from veg to bloom without ramping down.
Supplementation
Even with the enhanced calcium and magnesium, some growers still run supplemental cal-mag in coco — it's just how coco works. Don't assume you won't need it. Test and adjust.
Technical specifications
- Format: Two-part liquid base nutrient (Part A + Part B)
- Phase: Bloom
- Designed for: Coco coir growing media
- Key additives: Humates, fulvates, L-form amino acids, chelated calcium, chelated magnesium, chelated iron
- Surfactant: Wet Betty (organic wetting agent for nutrient uptake)
- pH Perfect technology: Auto-buffers pH 4.5–8.5 range
- Available sizes: 500mL, 1L, 10L
- Mixing ratio: Equal parts A and B
- EC: Higher salinity than standard hydro nutrients (pH Perfect formulation increases dissolved solids)
Who this is for
- Coco growers using RO water or low-EC tap water who value not having to pH-meter everything
- Intermediate to experienced growers who've outgrown budget systems and want precision feeding
- Anyone running automated drip systems in coco where consistency matters
- Growers who've had nutrient lock-out problems and want a formula specifically built to prevent it in coco
- Those willing to invest upfront for a proven, proven-track-record system
Not ideal for beginners on the tightest budget (General Hydroponics Flora will do the job for less), or for growers using hard water where pH Perfect's advantages are less pronounced.
Our take
Sensi Coco Bloom is properly engineered for coco. The triple chelation (especially iron) is a genuine advantage, the pH Perfect technology removes real stress, and thousands of UK coco growers rely on it season after season. It's not the cheapest nutrient on the shelf, but the concentrate goes a long way and the consistency is worth the outlay.
One thing worth knowing: Advanced Nutrients products run higher EC than some competitors because of how pH Perfect is formulated. If you've got soft water and you're tired of pH hunting, this is worth the investment. If you're budget-first and don't mind metering pH manually, General Hydroponics will save you money. But if precision and convenience matter more than lowest cost, this is solid kit. Good time to buy while this stock holds.
