Dutch Pro Autoflower Bloom Soil A&B SW — Two-Part Nutrient for Fast-Cycle Plants on Soft Water
Best for: Soil growers in soft water areas running autoflowering varieties through their flowering phase
Our thoughts
Dutch Pro's been doing this for 30 years, and it shows. This is a proper two-part nutrient built specifically for autos in soil — not a generic bloom feed squeezed into the job. The soft water formulation matters more than people think, especially in the UK. One we recommend a lot for growers who want precision without the headache.
Dutch Pro Autoflower Bloom Soil A&B SW is a two-part liquid nutrient system formulated specifically for autoflowering plants grown in soil during the reproductive cycle. The soft water variant means it's optimised for UK tap conditions — lower background calcium and magnesium are compensated for in the mix, so your plants get exactly what they need without guessing.
Autoflowers have different nutritional demands than photoperiod varieties. They flower while still receiving long light cycles, so they need a nutrient that works harder and faster. This feed delivers a 5-2-6 NPK ratio designed to support explosive bloom development in that compressed window you're working with. Because it's a two-part system, you get proper micronutrient complexity that single-part feeds can't deliver — the minerals won't bind together, so they stay available when your plants need them.
How it compares
This is one of the few autoflower-specific bloom nutrients on the market, and it stands apart from the generic alternatives.
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Autoflower-specific formula: Most competitors build single bloom feeds that work for everything — this is designed for the timeline and light conditions autos actually face
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Water-adapted formulation: Soft water versions are less common than they should be. CANNA and Plant Magic also do them, but Dutch Pro backs 30 years of grower feedback into every batch
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Two-part system: Delivers better micronutrient availability than one-part feeds. More complex to manage, but more reliable results in soil
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Professional heritage: Dutch Pro doesn't cut corners on formulation — they prioritise what works over what's cheap to make
Usage guidance
Mixing and application
Fill your feed water container with soft water, add equal amounts of part A and part B at 2-3 ml per litre, and mix thoroughly. Use an EC or PPM meter to confirm you're hitting 1.8-2.0 EC for reliable strength. Never mix the concentrate bottles together — add each part separately to your water.
Feeding schedule
Switch to this feed once flowering has visibly started. Use it consistently through the entire bloom phase and into the final flush. Autoflowers don't have time for nutrient corrections, so consistency matters more than experimenting.
Water management
Water to 10-20% runoff to keep salt levels in check. Soil buffers nutrients differently to coco or hydro, so you've got slightly more room for error — but autos in particular respond better to moderate, steady feeding than heavy pushing.
Complementary products
Dutch Pro recommend pairing this with their Explode, Multi Total, and Keep It Clean products for best results through the cycle.
Technical specifications
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Format: Two-part liquid nutrient system (Part A and Part B supplied separately)
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NPK ratio: 5-2-6
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Target EC level: 1.8-2.0 mS/cm
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Recommended dosage: 2-3 ml/litre of each part (A and B)
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Application: Soil-grown plants only
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Water specification: Soft water formulation — optimised for low calcium/magnesium tap water (typical of UK supply)
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Measurement: Requires syringe, beaker, or calibrated dispenser; EC/CF/PPM meter strongly recommended for consistency
Who this is for
- Autoflower growers in soft water areas wanting a properly formulated bloom feed
- Soil growers who value precision and reliability over simplicity
- Experienced growers moving to autos for the first time and wanting nutrient support built for the timeline
- Semi-professional setups where consistent flowering results matter
- Anyone who's had issues with generic bloom feeds stalling autos mid-flower and wants to fix it
Our take
This is proper nutrient work. Dutch Pro haven't just repackaged a standard bloom feed — they've actually built something for how autoflowers grow. The soft water formulation is the kind of detail that separates thinking growers from the rest, and you can feel the 30 years of Dutch growing experience in the formulation choices.
If you're running autos in soil on soft water and you want to remove the guessing from your bloom phase, this is worth picking up. Does exactly what it should, day in, day out, and you'll see the difference compared to generic alternatives. Good time to buy while stock lasts.
