BAC

The BAC range at Plant & Flower

BAC fertilizers bring together Dutch expertise and premium ingredients for both organic and mineral cultivation. BAC (Biological Activator Concept) emerged from the Netherlands over 15 years ago when two entrepreneurs with a shared passion for organic growing joined forces — one brought decades of experience in rose cultivation and soil microbiology, the other expertise in growth stimulants. At Plant & Flower, your Belgian grow shop since 2011, you'll find the complete BAC catalogue with dedicated lines for each substrate.

BAC philosophy: feed the soil, not just the plant

What sets BAC apart is its emphasis on soil health. While many manufacturers focus solely on plant requirements, BAC dedicates equal attention to the root zone ecosystem. Thriving microbial activity translates into improved nutrient uptake, stronger root systems, and plants better equipped to handle stress and disease pressure — nutrients are absorbed more efficiently, roots develop more vigorously, and plants cope better with environmental fluctuations.

Organic line: certified gradual release

BAC organic products carry certifications from respected bodies including the Soil Association, Control Union, and Ecocert. These certified organic fertilizers release nutrients gradually as beneficial microbes break down the organic matter, preventing overfeeding and ensuring steady nutrition throughout the entire growth cycle. BAC Organic Grow 1 L is the base for vegetative growth, while BAC Organic Bloom 1 L takes over when flowering begins. For bloom intensification, BAC Organic PK Booster 1 L supplies organic phosphorus and potassium exactly when your plants need it most.

Mineral line: immediate availability per substrate

Growers seeking precise control will appreciate BAC's complete mineral range with dedicated formulations for soil, coco and hydro. BAC Soil Grow 1 L and the matching BAC Soil Bloom 1 L are calibrated to the natural buffering of soil substrates. In the final phase, the F1 Extreme Booster 1 L adds a concentrated PK supplement for maximum flower density. All these products work perfectly with automatic irrigation and complement accurate pH/EC monitoring.

Stimulants, additives and practical dosing

Beyond base nutrients, BAC develops targeted stimulants for every growth stage. Root Stimulator 120 ml encourages explosive root development in the early weeks — essential for establishing the foundation of vigorous plants. Final Solution 60 ml flushes accumulated salts from the substrate in the final weeks, delivering cleaner end products with more authentic flavour profiles. Larger formats and additional stimulants (Bloom Stimulator, Bio Clone, X-Seed, CalMag) complete the range for every cultivation style.

Dosing and cultivation parameters

• Starting dose: 50 % of recommended rate, then gradual increase
• Target EC soil: 1.2-1.8 mS/cm depending on phase
• Target EC hydro/coco: 1.4-2.2 mS/cm depending on phase
• Target pH: 5.8-6.5 (mandatory for hydro/coco, recommended for soil)
• Storage: 5-25 °C, away from light, 2 years shelf life from manufacturing date
• Fresh solution: mix per use, consume within a few days

FAQ - Frequently asked questions about BAC

Browse the full BAC range at Plant & Flower and enjoy fast delivery throughout Belgium. Our team is ready to help you build the perfect feeding programme for your substrate and experience level.