Dutch Pro Autoflower Grow Soil A&B SW — Specialist Two-Part Nutrients for Fast-Cycle Plants
Best for: Soil growers running autoflowering plants in soft water areas who want a nutrient system built for compressed growing cycles
Our thoughts
This is genuinely rare — a nutrient actually engineered for autoflowers rather than bolted on as an afterthought. Dutch Pro have spent 30 years getting this right. The soft water formulation matters if you're in a soft water area (most of the UK), and the NPK ratio respects that autos need less of everything because they're half the size and twice as quick. One we recommend for anyone serious about getting the most from a fast cycle.
Dutch Pro Autoflower Grow Soil A&B SW is a specialist two-part base nutrient formulated specifically for autoflowering plants grown in soil during the vegetative growth stage. This is the soft water version, optimised for UK water supplies (under 100mg/l calcium carbonate).
Unlike generic nutrients designed for larger photoperiod plants, this formula acknowledges a simple fact: autoflowers are smaller, grow faster, and need proportionally less feeding. The NPK ratio (3–2–5) and nutrient blend are tuned for that compressed cycle, so every day counts and you're not overfeeding out of habit.
It's a straightforward approach. Mix equal parts A and B, target an EC of 1.5–1.8, check your pH, and let the plants do what they do. No guesswork. No daily adjustments. Just stable, predictable feeding for a short, intense growing window.
How it compares
Autoflower-specific nutrients are almost non-existent. Most growers adapt photoperiod formulas and hope for the best.
- Specifically engineered for autoflower nutrition — not a generic base run at lower doses
- Soft water formulation matches UK supply chemistry (most competitors ignore water quality entirely)
- Proven Dutch heritage — 30 years of professional grower input
- Two-part system gives you control without the complexity of three-part or all-in-one blends
In practical terms, you're getting a nutrient designed for what you're actually growing, not a downscaled version of something built for something else.
Usage guidance
Dosing
Add 2–3ml of Part A and 2–3ml of Part B per litre of water. Use a syringe or measuring beaker for accuracy. Autoflowers are smaller than photoperiods and require lighter feeding overall — start at the lower end (2ml) and increase gradually as growth accelerates. Do not jump straight to full strength.
Mixing
Fill your container with water, add equal amounts of A and B, mix thoroughly. Use an EC or PPM meter (something like a Bluelab Truncheon) to confirm you've hit your target strength.
pH management
Adjust to 5.8–6.5 using pH up or down. Dutch Pro's own pH down is nitric acid-based, which works better during vegetative stages than the phosphoric acid found in most generic pH solutions.
Watering in soil
Allow soil to dry slightly between waterings — not bone dry, just enough to let roots hunt for moisture. This encourages stronger root development, especially important in fast-growing autos.
Timing
Use this during the vegetative stage only. Switch to a bloom-specific nutrient or finish formula once flowering begins (or follow the plant's natural transition in autos).
Complementary products
Dutch Pro recommend pairing this with Multi Total (trace element insurance), Take Root (early-stage root support), and Keep It Clean (tank hygiene). Worth considering if you want to dial in results.
Technical specifications
- Product type: Two-part base nutrient (Part A and Part B)
- Growth stage: Vegetative
- Growing medium: Soil
- Plant type: Autoflowering varieties
- Water formulation: Soft water (optimised for supplies under 100mg/l calcium carbonate)
- NPK ratio: 3–2–5
- Nutrient profile: 17 essential macro and micronutrients (based on Liebig's Law of the Minimum)
- Target EC: 1.5–1.8 mS/cm
- Recommended dosage: 2–3ml Part A + 2–3ml Part B per litre
- pH range: 5.8–6.5
- Mixing ratio: Equal parts A to B
Who this is for
- Soil growers in soft water areas (most of the UK) who want a nutrient matched to their water chemistry
- Autoflower specialists looking to optimise for compressed growing cycles
- Growers frustrated with overfeeding autos using generic photoperiod formulas
- Anyone who wants a straightforward two-part system without three-part complexity or all-in-one compromises
- Experienced growers who value precision and stability over simplicity marketing
Not ideal if you're in a hard water area (Dutch Pro make a separate hard water version) or growing photoperiod plants exclusively — this is built for autos specifically.
Our take
This is genuinely specialist kit. In a market where most autoflower nutrients are just photoperiod formulas run at lower doses, Dutch Pro actually designed this from the ground up. The soft water formulation is a real advantage if you're in the UK — most nutrient makers ignore water chemistry entirely.
For autoflower growers in soft water areas who want nutrients built for what they're actually doing, not adapted from something else, worth picking up while stock lasts. Proper kit at a lower price than you'd expect for this level of specialisation.
