We'll only email you about this product — no marketing.
Bio Grow by Biobizz: 100% Organic Fertiliser from Dutch Sugar Beet
Bio Grow is a liquid organic fertiliser made from Dutch sugar beet extract (vinasse) that feeds both your plants and the living soil beneath them. Developed by Biobizz — one of the longest-running organic nutrient brands in the Netherlands — Bio Grow delivers natural glucose, potassium, and a full spectrum of micronutrients that keep your root zone buzzing with microbial activity from veg right through to harvest.
We've stocked Biobizz since the early days, and Bio Grow remains one of the most-requested bottles on our grow shop shelves. The reason is simple: it works, it smells like molasses (because it basically is), and it plays nicely with almost any growing medium. If you want flavour-packed, aromatic harvests without synthetic salts, this is where you start.
Available Size
Bio Grow currently ships in a 250 ml bottle — enough for 62–250 litres of nutrient solution depending on your dilution rate. Running a full cycle with multiple plants? You'll likely want two bottles, or consider sizing up to a larger Biobizz format when it becomes available.
Why Bio Grow Belongs in Your Grow Room
Synthetic fertilisers dump salts straight into your medium. They feed the plant, sure — but they do nothing for the billions of microorganisms that make organic soil actually work. Over time, salt buildup kills off beneficial bacteria and fungi, leaving you with a dead substrate that depends entirely on you for every nutrient input. That's a treadmill nobody wants to be on.
Bio Grow takes the opposite approach. Vinasse — the byproduct left after sugar is extracted from beets — is naturally rich in glucose and potassium. When you water it in, soil microbes feast on the sugars and break down organic matter into plant-available nutrients. The result: a self-sustaining root zone that gets stronger over time rather than weaker. Your plants grow more vigorously, develop better resistance to pests and disease, and produce harvests that actually taste like something.
The honest limitation? Bio Grow is a grow-phase base nutrient with a moderate NPK, not a standalone bloom booster. During heavy flowering, you'll want to pair it with a dedicated bloom feed to hit the phosphorus and potassium levels your plants demand. It's also thick and dark — shake the bottle well before each use, or you'll get inconsistent dosing. One more thing: the molasses smell is strong. Not unpleasant, but your grow room will smell like a bakery for a few hours after feeding.
Bio Grow Specifications
| Specification | Detail |
|---|---|
| Brand | Biobizz |
| Product Type | Liquid organic fertiliser |
| Base Ingredient | 100% Dutch sugar beet extract (vinasse) |
| Size | 250 ml |
| Dilution Rate | 1–4 ml per litre of water |
| Yield per Bottle (at 1 ml/L) | 250 litres of nutrient solution |
| Yield per Bottle (at 4 ml/L) | 62.5 litres of nutrient solution |
| Application Stage | Vegetative growth through end of bloom |
| Suitable Media | Soil, light mix, coco coir |
| Certifications | NOP Input (Control Union), Clean Green Certified, Organic (Control Union) |
| SKU | HS2827 |
Complete your Biobizz setup: Bio Grow handles the base nutrition, but for explosive flowering you'll want to pair it with Biobizz Bio Bloom. Running in Biobizz All-Mix soil? That pre-amended substrate already contains enough nutrition for the first 2–3 weeks, so hold off on Bio Grow until your plants hit 10–15 cm. For root zone health, Biobizz Root Juice makes a solid companion during transplant and early veg.
How to Use Bio Grow Fertiliser
Start feeding once your plants reach 10–15 cm in height. Before that point, most pre-amended soils provide everything a seedling needs. Biobizz publishes specific dilution rates depending on your medium, and we'd stick to their guidelines — they've been dialling these in for decades.
- Shake the bottle thoroughly. Vinasse is thick and settles at the bottom. Skip this step and your first pour will be mostly water while the last pour is pure sludge.
- Measure your dose. In regular soil, use 1 ml per litre of water from the start of veg through the end of bloom. In light soil or coco mix, start at 2 ml per litre during veg and early flowering, then increase gradually to 4 ml per litre over the final 4–5 weeks of bloom.
- Mix into room-temperature water. Stir well. The solution will turn a dark brown — that's normal. If you're using Biobizz All-Mix soil, drop to 1 ml per litre since the medium is already nutrient-rich.
- Water your plants as normal. Apply at every watering, or every other watering if your plants show signs of overfeeding (dark green leaves, leaf tip burn). Many experienced growers we've spoken to start at half the recommended dose and work up — not all plants are equally hungry.
- Flush before harvest. In regular soil, flush with plain water for 1 week before you chop. In coco or light mix, give yourself at least a week of flushing as well. This clears residual nutrients and lets the plant's own flavour profile come through in the final product.
Bio Grow vs Other Organic Fertilisers
| Feature | Biobizz Bio Grow | Typical Organic Liquid Feed |
|---|---|---|
| Base ingredient | 100% Dutch sugar beet vinasse | Varies (seaweed, fish, guano blends) |
| Microbial feeding | Yes — glucose directly feeds soil biology | Indirect — relies on decomposition |
| Certifications | NOP, Clean Green, Control Union Organic | Varies — many lack third-party certification |
| Smell | Strong molasses / treacle | Varies — fish-based products smell significantly worse |
| Veg + bloom use | Yes — continuous use across both stages | Often veg-only, requiring a separate bloom product |
| Dilution range | 1–4 ml per litre | Typically 2–5 ml per litre |
Compared to fish-based organic feeds, Bio Grow has one massive advantage: it doesn't stink of fish. If you're growing indoors, that matters. The molasses aroma fades within hours; fish emulsion lingers for days. The trade-off is that vinasse-based feeds tend to be lower in nitrogen than fish hydrolysate, so heavy feeders in late veg might need a top-up. For most home growers running 2–6 plants, Bio Grow covers the job.
What Makes Vinasse Special for Organic Growing
Vinasse is a byproduct of sugar production — specifically, the liquid left over after sugar beets are processed and the sucrose is crystallised out. What remains is a concentrate packed with natural glucose, potassium, and trace minerals. When you pour this into your soil, you're essentially laying out a buffet for beneficial microbes. Bacteria and mycorrhizal fungi metabolise the sugars, multiply rapidly, and in turn make nutrients in the soil available to your plant roots.
This is why Bio Grow works as both a plant feed and a soil conditioner. You're not just pushing NPK numbers — you're building a living ecosystem in your pot. Over successive grows in the same soil, this microbial population compounds. We've talked to growers who reuse their Biobizz-fed soil season after season, and they consistently report better results in year two and three than in year one. The soil literally gets better with age, which is the exact opposite of what happens with synthetic salt-based feeding.
Frequently Asked Questions
Can I use Bio Grow in hydroponic systems?
Not recommended. Bio Grow is designed for soil and coco substrates where microbial activity does much of the heavy lifting. In a hydro setup, the organic compounds can clog lines and create biofilm in your reservoir. Stick to soil or coco for best results with this product.
How long does a 250 ml bottle of Bio Grow last?
At 1 ml per litre, you get 250 litres of nutrient solution — enough for a small soil grow of 2–4 plants through a full cycle. At 4 ml per litre in coco during late bloom, you'll get roughly 62 litres. Most home growers running 3–4 plants in soil find a single 250 ml bottle covers one complete grow.
Does Bio Grow smell bad?
It smells like dark treacle or molasses — sweet, thick, earthy. Not unpleasant at all, especially compared to fish-based organic feeds. The smell fades from your grow room within a few hours of watering. Your soil might retain a faint sweetness, which is actually a sign that the microbes are happy.
Can I use Bio Grow with other Biobizz products?
Absolutely — it's designed to work within the full Biobizz range. Pair it with Bio Bloom for flowering, Top Max for flavour enhancement, and Root Juice for transplant support. Biobizz publishes a detailed feed chart that maps out exact dosages for each product across your grow cycle.
Should I use Bio Grow at full strength from the start?
We'd say no. Start at half the recommended dose — especially if your soil is pre-amended — and increase based on how your plants respond. Dark green, waxy leaves or burnt tips mean you're overfeeding. Pale, slow growth means you can push the dose up. The 1–4 ml range gives you plenty of room to dial in.
Is Bio Grow suitable for houseplants and vegetables?
Yes. It works on anything that grows in soil — tomatoes, herbs, peppers, decorative houseplants, the lot. For houseplants, stick to 1 ml per litre every other watering during the growing season (spring through autumn). Back off entirely in winter when growth slows.
What certifications does Bio Grow hold?
Three: Control Union NOP Input certification (meeting the US National Organic Program standard), Clean Green Certification, and Control Union Organic certification. These aren't self-declared labels — they're independently audited. That puts Bio Grow among the most thoroughly certified organic fertilisers on the market.
Last updated: April 2026
