Dutch Pro Autoflower Bloom Hydro/Coco A&B SW — Two-Part Bloom Nutrients for Fast-Growing Plants on Soft Water
Best for: Experienced growers running autoflowering plants in hydroponic or coco systems where soft water is the norm
Our thoughts
Dutch Pro have spent 30 years perfecting nutrients for professional growers, and it shows. This bloom formula is built specifically for autos — plants with short flowering windows that can't afford wobbles. The soft water variant keeps EC stable without over-loading, which means cleaner uptake and less fade halfway through flower. Simple two-part system, no faffing about with extras you don't need.
Dutch Pro Autoflower Bloom Hydro/Coco A&B SW is a professional two-part bloom nutrient formulated specifically for fast-growing autoflowering plants in hydroponic and coco systems. The soft water variant is optimised for UK water conditions where mineral content is low, ensuring your EC stays balanced throughout the flowering cycle without lockout risk or unnecessary nutrient stacking.
This is nutrient design built on three decades of Dutch growing expertise — stripped back to what actually matters. No marketing fluff, no 47 additives you'll never use. Just a clean, concentrated two-part system that delivers the phosphorus, potassium, and trace elements autos need to flower hard during their compressed light cycles.
How it compares
Dutch Pro sits in the professional-grade, value-focused tier of two-part hydro and coco bloom systems.
- Formulated specifically for autoflowering varieties (most competitors still treat them as standard plants)
- Soft water and hard water variants available — actually adjusted for regional water profiles instead of one-size-fits-all
- Significantly less expensive than Advanced Nutrients or CANNA equivalents, without compromising nutrient profile
- Simpler system than competitors — typically requires only 4 bottles total across grow and bloom phases, vs. 6+ with luxury brands
- High concentrate formulation means better value per litre mixed
In short: professional formula, grower-focused pricing, zero corporate overheads baked into the bottle.
Usage guidance
Mixing and application
Add part A to your water or reservoir first, stir thoroughly, then add part B. Never pre-mix the concentrates together. Dosage: 2.5–3.5 ml/litre of both part A and part B. Use a syringe or measuring beaker for accuracy, and monitor with an EC/PPM meter (Bluelab Truncheon or equivalent) to dial in your exact feed strength.
Hydroponic systems
Works across all hydro setups — DWC, flood and drain, drip, NFT, recirculating systems. Dutch Pro users report particularly strong results in flood and drain with coco mixes. In recirculating systems, check your EC daily and top up with RO water as uptake increases.
Coco coir growing
Coco binds calcium and magnesium differently than soil or hydro clay — the soft water formulation compensates for this. Expect 10–20% runoff per feed, and let medium dry slightly between watering cycles.
Feeding window and adjustment
Start from the moment flowering begins and continue through final flush. Autos don't have recovery time like photoperiodic plants, so consistency matters more than swings. Keep your EC stable rather than chasing higher numbers. Monitor leaf colour — yellowing late in flower is normal; dark green with purple stems mid-flower suggests you're dialled in.
Complementary products
Dutch Pro recommend pairing this bloom feed with Dutch Pro Autoflower Grow (vegetative phase), plus Dutch Pro Explode (bloom booster for extra flowering density) and Keep It Clean (reservoir maintenance). For coco specifically, a calcium/magnesium supplement can help if your tap water is particularly soft.
Technical specifications
- Format: Two-part concentrate (Part A + Part B in equal ratios)
- Recommended dosage: 2.5–3.5 ml/litre of part A + part B
- Water type optimisation: Soft water formulation (hard water variant also available)
- Compatible systems: Hydroponic (DWC, flood & drain, drip, NFT, recirculating), coco coir, inert media
- Nutrient type: Mineral-based synthetic, 100% soluble
- Application method: Reservoir feeding, hand feeding, automated drip irrigation
- Measurement: Requires EC/PPM meter for accurate dosing
Who this is for
- Experienced hydroponic and coco growers familiar with two-part nutrient systems
- Growers running autoflowering varieties who understand their tight feeding windows and short recovery time
- Commercial or semi-commercial operators managing multiple plants or rooms where nutrient cost adds up
- UK growers on soft water supplies who need a formulation that won't leave them chasing lockout
- Anyone after professional-standard nutrients without the premium brand markup
- Growers who value simplicity — fewer bottles, fewer additives, just proper nutrition
Particularly suited to setups where precision and reliability matter more than brand recognition, and where growers understand their water profile and feeding targets.
Our take
This is proper professional nutrition at a price that actually makes sense. Dutch Pro have built a reputation across Europe for delivering results without the corporate fluff, and this bloom formula proves why. It's formulated for the specific demands of fast-growing autoflowers — short cycle, extended light exposure, zero recovery margin — and the soft water variant removes the guesswork from UK water chemistry.
If you're serious about hydro or coco growing and tired of paying premium prices for branding, this is worth picking up while stock lasts. Does exactly what it should, day in, day out.
