Dutch Pro Original Bloom Soil A&B HW — Two-Part Bloom Nutrients for Hard Water Growing
Best for: Soil growers in hard water areas wanting professional-grade bloom nutrients without the premium price tag
Our thoughts
Dutch Pro have been making proper nutrients for 30 years, and it shows. This is a straightforward two-part bloom formula optimised specifically for hard water — which matters if you're anywhere in the UK. It delivers the phosphorus and potassium your plants need during fruiting without overcomplicating your feeding schedule or your budget.
Dutch Pro Original Bloom Soil A&B HW is a two-part base nutrient designed specifically for the bloom and fruiting phase in soil-grown crops, optimised for hard water areas. Equal parts A and B, it gives you full control over nutrient strength while taking the guesswork out of what your plants actually need. The hard water formulation means it's tailored to UK water supplies — no compromises, no excess calcium and magnesium fighting with your feed.
This is professional-grade stuff born in Amsterdam and trusted by growers across Europe for three decades. The fact they've spent the money on what's in the bottle rather than fancy packaging is exactly why it represents proper value.
How it compares
Dutch Pro sits in the professional-value bracket — serious performance, sensible cost.
- Specifically formulated for hard water; most UK competitors don't bother with region-specific versions
- Two-part system delivers more micronutrients than single-part alternatives, meaning better plant health and faster fruiting
- Food-grade, highly soluble ingredients leave zero residue — your plants stay clean, your medium stays stable
- 30-year heritage and proven track record vs. newer, heavily marketed brands
- Significantly lower cost than premium names like Advanced Nutrients, without sacrificing results
You're getting research-backed formulation at a price that doesn't assume you're running a commercial operation.
Usage guidance
Dutch Pro Original Bloom is straightforward to use across different watering methods:
Dosage
Apply 2–3 ml of Part A and 2–3 ml of Part B per litre of water. Use an EC/CF/PPM meter (like a Bluelab Truncheon) to dial in your strength. Target EC levels between 1.8 and 2.0 for best results.
Mixing
Fill your water container, add equal parts A and B, mix thoroughly. Add any boosters or additives after (Dutch Pro recommend pairing it with Explode for yield boost and Multi Total for micronutrient coverage). Mix again.
pH management
Maintain pH between 5.8 and 6.5 for optimal nutrient uptake in soil. Most tap water in the UK will sit comfortably in this range, especially with the hard water formulation doing the heavy lifting.
Application
Works equally well with hand watering or any automated irrigation system. Feed at strength 2–3 times per week depending on pot size and growth stage, adjusting based on plant response.
What it does
The 5-2-6 NPK ratio is built for blooming and fruiting — higher potassium supports flower development and yield, while balanced phosphorus and secondary nutrients drive quality. You're providing all 17 essential macro and micronutrients in a form your plants can absorb immediately, with minimal waste.
Technical specifications
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Format: Two-part liquid (Part A and Part B in equal ratio)
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Available sizes: 1L, 5L, 10L, 20L bottles
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NPK ratio: 5-2-6
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Target EC: 1.8–2.0 mS/cm
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Dosage: 2–3 ml/litre of Part A + 2–3 ml/litre of Part B
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Optimal pH range: 5.8–6.5
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Nutrient profile: Complete macro and micronutrient package (17 essential nutrients)
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Formulation: Hard water optimised (pre-balanced for high calcium and magnesium in UK water)
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Solubility: Food-grade, highly soluble, zero residue
Who this is for
- Soil growers moving from single-part to two-part nutrients for better results
- Growers in hard water areas (most of the UK) who want formulation that actually accounts for their water chemistry
- New growers with confidence beyond complete beginners — two-part systems suit people ready to measure and dial in strength
- Experienced growers looking to cut nutrient costs without dropping quality or reliability
- Anyone running multiple pots or beds where feed costs add up quickly
Particularly well suited to growers who want professional performance without the premium brand markup and who value proven heritage over marketing hype.
Our take
This is straightforward, professional-grade bloom nutrition at a price that actually makes sense. The hard water formulation is a genuine differentiator — most nutrient companies ignore regional water chemistry, but Dutch Pro didn't. That attention to detail is why their stuff has worked for three decades.
Two-part systems sit in a sweet spot: more micronutrient coverage than single-part, less complexity than three-part boosters. If you're ready to move beyond entry-level feeding and you're in a hard water area, this does the job properly. Good time to buy while stock lasts.
