Dutch Pro Original Grow Soil A&B HW — Two-Part Vegetative Nutrients for Hard Water Areas
Best for: Soil growers in hard water regions wanting a dedicated veg feed that won't overcomplicate things
Our thoughts
After 30 years of Dutch growing expertise, Dutch Pro know how to build soil nutrition properly. This veg formula accounts for what's already in your hard water supply, which saves you the headache of constantly fighting mineral buildup. It's one we recommend a lot for new soil growers who want steady, predictable growth without the guesswork.
Dutch Pro Original Grow Soil A&B HW is a two-part mineral base nutrient specifically formulated for soil-grown plants during the vegetative stage in hard water areas. Unlike universal feeds that split focus across multiple growth phases, this is built to do one job properly: support vigorous structural growth while working with your water chemistry, not against it.
The hard water formulation is the key. Hard water already contains dissolved minerals (mainly calcium and magnesium). Standard nutrients don't account for this, which can lead to imbalances and salt buildup over time. Dutch Pro's HW version factors this in, meaning you feed with confidence rather than constantly correcting.
How it compares
This sits in the professional-grade soil veg feed category, positioned between entry-level all-in-one feeds and ultra-premium brands.
- Two-part system means more micronutrients than one-part feeds can deliver without chemical breakdown
- Hard water-specific formulation — solves a real regional problem that universal feeds ignore
- Separate Grow and Bloom products offer more precision than universal grow-to-bloom formulas
- Straightforward 2-3 ml/L dosing, no complicated EC ranges to chase
House & Garden Soil works as a grow-and-bloom universal feed. Dutch Pro's approach is the opposite: dedicated veg for growth, dedicated bloom for flowering. If you want control and stage-specific feeding, this is it.
Usage guidance
Mixing correctly
Fill your watering vessel with water first. Add Part A, mix thoroughly until dissolved. Then add Part B and mix again. Never combine the concentrates together — calcium and sulphur will bind and lock up. The two-part split prevents this chemical reaction.
Dosage
Add 2-3 ml of Part A and 2-3 ml of Part B per litre of water. Target EC of 1.5-1.8. Use an EC/CF/PPM meter (like a Bluelab Truncheon) to check strength — it's the only way to dial in accuracy across your water supply and plant needs.
pH range
Maintain pH 5.8-6.5 for optimal nutrient uptake in soil. Dutch Pro recommend their pH Down for Grow (formulated with nitric acid rather than phosphoric, which works better during vegetative stages).
Feeding schedule
Use throughout the entire vegetative stage. Once you switch to flowering, move to Dutch Pro Original Bloom Soil A&B. Building strength during veg is what sets up explosive growth later.
Hand watering vs. irrigation
Works equally well for both. If using an automated system, ensure your reservoir is cleaned regularly to prevent salt accumulation in soil.
Technical specifications
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Nutrient type: Two-part mineral base nutrient for soil
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Growth stage: Vegetative cycle only
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N-P-K ratio: 4-2-6
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Micronutrient content: 17 macro and micronutrients included (full comprehensive formula)
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Dosage: 2-3 ml Part A + 2-3 ml Part B per litre of water
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Target EC: 1.5-1.8 mS/cm
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Optimal pH range: 5.8-6.5
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Residue profile: Minimal residue when dosed correctly; designed for complete nutrient absorption
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Substrate compatibility: Soil, peat, and compost-based media
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Available sizes: 1L, 5L, 10L, 20L bottles
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Mixing instruction: Never mix Part A and Part B concentrates together; always dilute in water first
Who this is for
- Soil growers in hard water areas (England, Wales, Scotland central belt)
- New growers wanting a dedicated veg feed without the complexity of universal formulas
- Experienced growers who value Dutch growing heritage and professional-grade ingredients over brand hype
- Anyone building multiple soil plants where consistent, predictable feeding matters
- Growers who want to avoid slow mineral salt buildup that often plagues soil feeding in hard water
Particularly suited to setups where growth stage precision and water chemistry adaptation matter more than simplification.
Our take
Dutch Pro didn't spend 30 years refining nutrition formulas just to package them prettily. This veg feed works because it's built for soil chemistry and hard water reality — not some theoretical ideal. The two-part system means you're getting proper micronutrient density, and the hard water formulation solves a real problem most nutrients ignore.
If you're on hard water and sick of fighting nutrient imbalances mid-veg, this is worth picking up. Straightforward, professional-grade, and it does exactly what it should day in, day out. Good time to buy while clearance stock lasts.
