Dutch Pro Autoflower Grow - Soil A&B HW — Two-Part Soil Nutrients for Fast-Cycle Plants
Best for: Growers running fast-cycle plants in soil who want a professional-grade base nutrient that actually works with hard water
Our thoughts
This is proper grower kit. Dutch Pro have spent 30 years getting the formula right, not the packaging. The hard water version cuts out the guesswork for UK growers — just mix A and B, keep your EC steady, and let the nutrient do the heavy lifting. Fast-cycle plants don't have time for messing about, and this doesn't waste any.
Dutch Pro Autoflower Grow - Soil A&B HW is a specialised two-part mineral base nutrient designed specifically for the vegetative growth phase of fast-cycle soil plants in hard water areas. This isn't a universal formula. It's built for plants that need to move fast, with every day counting before the transition to flowering.
The two-part system separates nutrients that can't safely mix in high concentrations — calcium, magnesium, and sulphur would bind together and become unusable if combined. By splitting them, Dutch Pro gives your plants access to all 17 essential macro and micronutrients in a form they can actually use. The hard water formulation means you're not fighting your water supply; you're working with it.
Simply dose 2-3 ml/litre of both Part A and Part B into your feed water, mix well, and check your EC with a meter. That's it. No overthinking, no daily tweaks. Stability beats clever feeding every time with fast-cycle soil grows.
How it compares
Dutch Pro sits in the professional-grade, value-focused bracket of two-part soil nutrients.
- Purpose-built for fast-cycle plants, not a universal grow/bloom compromise
- Hard water-specific formulation — UK growers have an advantage competitors don't
- Highly concentrated formula means better cost-per-use than bulkier alternatives
- 30-year heritage from Dutch commercial growers, not marketing budget spent on packaging
- Works cleanly with recommended additives (Multi Total, Take Root, Keep It Clean) if you want to layer them in
House & Garden Soil is a universal grow/bloom formula. CANNA Aqua is solid but pricier. Dutch Pro is the choice when you want specificity and value without compromise.
Usage guidance
Mixing and dosing
Fill your feed water container and add equal amounts of Part A and Part B separately. Dutch Pro recommend 2-3 ml/litre of each part. Use a syringe or measuring beaker for accuracy — eyeballing it wastes money and causes feeding swings. Don't pre-mix A and B together; add them separately to your water and stir well.
Monitoring strength
Use an EC or PPM meter (Bluelab Truncheon is the standard). Target EC 1.5-2.0 (PPM 750-1,000) during vegetative growth. This range gives you the density you need for vigorous growth without pushing too hard.
Feeding routine
Autoflowers move on a tight timeline. Keep your feeding consistent — same strength, same schedule. Weekly checks prevent drift. Don't chase daily swings or adjust based on feel. Stability is the winning move here.
Hard water advantage
This formulation is optimised for hard water areas. If you're in a region with high calcium and magnesium in your tap water, this takes that into account and prevents the nutrient lockout you'd get with a standard formula.
Technical specifications
- Type: Two-part concentrate base nutrient (Part A & Part B)
- Format: Liquid concentrate for soil growing
- Formulation: Hard water optimised
- Essential nutrients: All 17 macro and micronutrients (Liebig's Law based)
- Recommended dosage: 2-3 ml/litre of Part A + 2-3 ml/litre of Part B
- Target EC range: 1.5-2.0 mS/cm
- Target PPM range: 750-1,000 ppm
- Nutrient separation: Two-part system prevents calcium-sulphur binding and preserves micronutrient availability
- Compatible additives: Dutch Pro Multi Total, Take Root, Keep It Clean
- Suitable for: Soil-grown fast-cycle plants during vegetative growth phase
Who this is for
- Intermediate to advanced growers running soil setups with fast-cycle varieties
- Growers in hard water areas who want a formulation built for their water profile
- Anyone who's had nutrient problems with universal grow/bloom formulas
- Soil growers who want professional-grade nutrients without the premium price tag
- Growers who understand that two-part systems deliver more reliable micronutrient availability than one-part
- Anyone who values stability and consistency over experimental feeding
Not for beginners who haven't used an EC meter yet — this requires basic measuring discipline. But if you're comfortable with concentration-based feeding, this is straightforward kit.
Our take
Dutch Pro Autoflower Grow - Soil A&B HW does exactly what it's designed to do: feed fast-cycle plants during their vegetative phase with all the nutrients they can actually use, formulated for UK hard water. No fuss, no guessing.
The hard water version is a genuine advantage if you're in a region where tap water is heavy. The two-part separation means you're getting nutrient availability competitors charge more for. And 30 years of Dutch professional grower heritage backing the formula beats marketing spend every time.
If you're serious about growing fast-cycle soil plants properly, this is worth picking up. Good time to buy while stock lasts.
