Dutch Pro Autoflower Bloom Hydro/Coco A&B HW — Two-Part Bloom Nutrients for Hard Water Areas
Best for: Growers running autoflowering plants in hydro or coco who want a simple, proven two-part nutrient that actually accounts for hard water
Our thoughts
Dutch Pro has spent 30 years getting nutrients right rather than packaging them fancy. This autoflower bloom formula is built for plants that flower under long light cycles, and the hard water variant means you're not fighting your local water supply. Straightforward, concentrated, and it works.
Dutch Pro Autoflower Bloom Hydro/Coco A&B HW is a two-part bloom nutrient system specially formulated for the flowering and fruiting stage of autoflowering plants grown in hydroponic or coco setups. The hard water variant is calibrated for areas with mineral-rich tap water, which makes a real difference to nutrient uptake and plant health. It's a simple base feed — no guesswork, no unnecessary complexity — designed to deliver proper results without rinsing your budget.
How it compares
This sits in the professional-performance-at-sensible-cost bracket of two-part bloom nutrients.
- Specialised autoflower formulation — not just a standard bloom rebadged
- Hard water specific, so you're not adding extra buffers or fighting mineral lockout
- Highly concentrated formula — more yield per litre than many competitors
- No pH Perfect tech premium — you get the results without the markup
- Designed to work alongside Dutch Pro boosters like Explode, but stands alone perfectly well
Against direct competitors like CANNA or Advanced Nutrients, you're getting equivalent nutritional science at a lower entry price, with the added advantage of being formulated specifically for autoflowering plants.
Usage guidance
This is a two-part base nutrient, so mixing and feeding are straightforward:
Mixing your nutrient solution
Fill your reservoir or feed water container with tap water. Add equal amounts of Part A and Part B — Dutch Pro recommend 2.5 to 3.5 ml per litre of each part. Mix thoroughly. Use an EC/PPM/TDS meter (like a Bluelab Truncheon) to check your nutrient strength. This gives you full control and means you can dial in exactly what your plants need.
Hard water advantage
Because this is formulated for hard water, the mineral content in your tap water has already been accounted for in the nutrient balance. You don't need to add extra calcium or magnesium buffers — just mix and feed. If you're in a soft water area, this will still work fine, but you might want to check your local water report and adjust slightly if needed.
Hydroponic systems
Works cleanly in all hydro setups — NFT, flood and drain, drip systems, deep water culture. Change your reservoir every 2-3 weeks to prevent nutrient imbalance drift.
Coco cultivation
Mix into your feed water for hand watering or drip systems. Coco growers typically feed to 10-20% runoff per watering. Because coco is inert, you're in complete control of what goes into the plant — that's the whole point of mineral nutrients in coco.
Recommended additions
Dutch Pro make Explode (flowering booster), Multi Total (micronutrient complex), and Keep It Clean (system cleaner) as complementary products. These work with this nutrient but aren't essential — this A&B base will deliver solid results on its own.
Technical specifications
- Format: Two-part liquid nutrient system (Part A and Part B)
- Purpose: Bloom/fruiting stage
- Suitable for: Hydroponic systems and coco coir
- Formulation: Specifically designed for autoflowering plants
- Water type: Hard water variant
- Recommended dosage: 2.5–3.5 ml/litre of Part A + 2.5–3.5 ml/litre of Part B
- Measurement: Use EC/PPM/TDS meter to check nutrient strength
- Concentration: Highly concentrated formula
- Brand heritage: Dutch Pro, 30+ years of hydroponic nutrient development
Who this is for
- Autoflower growers who want a nutrient actually formulated for their plant type
- Growers in hard water areas tired of nutrient lockout and deficiency issues
- Hydro and coco growers wanting a simple, proven two-part base feed
- Budget-conscious growers who don't want to pay premium prices for fancy branding
- Anyone running multiple flowering plants where a concentrated formula saves money
- Growers who value practical results over complex multi-part systems
Our take
This is professional-grade bloom nutrition without the professional-grade price tag. Dutch Pro have spent three decades perfecting nutrient science rather than packaging design, and it shows. The autoflower-specific formulation actually matters — these plants have different light cycle demands — and the hard water calibration removes a real pain point for growers in mineral-heavy areas.
Simple, reliable feeding that delivers results without overcomplicating your schedule. Works consistently, mixes easily, and gives you full control through EC/PPM measurement. Good time to buy while stock lasts. One we recommend a lot for growers wanting to step up from three-part systems or basic feeds without paying the premium brand premium.
