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Plagron Alga Grow 0.5l
Plagron Alga Grow 0.5L is a mid-sized bottle of organic vegetative nutrient based on marine algae extracts, formulated for the growth phase of soil-cultivated plants. This half-litre contains the same concentrated organic formula with an NPK profile of 4-2-4 and six essential trace elements including iron, manganese and boron. Seaweed-derived phytohormones and amino acids support robust root development and efficient chlorophyll production. At 1:250 dilution, 0.5L of concentrate yields up to 125 litres of nutrient solution, covering three to six plants through a full vegetative cycle. An effective mid-range option for growers balancing volume needs with storage constraints.
Plagron Alga Grow 0.5L – Mid-Range Organic Seaweed Nutrient
The Plagron Alga Grow 0.5L is the practical mid-range format for growers seeking organic vegetative nutrition without committing to a large container. This half-litre bottle contains the same concentrated formulation based on marine algae extracts and sugar beet vinasse found in every other packaging size. It suits growers operating a small grow tent with a handful of plants or those evaluating the Alga line before scaling up. Explore the full selection in our Plagron category and configure a bespoke organic feeding schedule.
Key specifications
Despite its compact footprint, the Alga Grow 0.5L delivers the exact same active ingredient concentration as larger formats. The formulation is entirely organic and supplies every building block required during the vegetative stage.
- Complete organic NPK profile: 4.2% total nitrogen (3.3% organically bound), 2.4% water-soluble P₂O₅ and 4.3% water-soluble K₂O for balanced vegetative development
- Six trace elements including iron (0.020%), manganese (0.014%) and boron (0.010%) driving metalloenzyme activity and photosynthetic pigment synthesis
- Pre-adjusted pH of 5.5 enabling direct root uptake without the need for additional pH correction in most soil substrates
- Dark brown liquid with a molasses-characteristic odour, producing zero foam during mixing and application
Application and dosage
Add a maximum of 4 mL of Alga Grow per litre of water and apply this solution at every irrigation throughout the vegetative phase. Half a litre of concentrate produces up to 125 litres of nutrient solution, comfortably covering three to six plants for the duration of an average growth cycle. Shake the bottle well before each use and store between 0°C and 35°C, shielded from frost and direct sunlight. For a complete organic protocol, combine Alga Grow with products from the Plagron Easy Pack Natural.
Grower benefits
The 0.5L format strikes an effective balance between unit cost and volume. It provides enough product to sustain a full vegetative cycle with a small plant count, without the need to warehouse excess inventory. The organic seaweed formulation ensures a gradual nitrogen release profile that prevents over-fertilisation, while endogenous phytohormones promote compact, vigorous plant architecture. our nutrients category is a brand that growers at every experience level trust for reproducible, high-quality results season after season.
Combinations and alternatives
Pair the Alga Grow 0.5L with Plagron Alga Bloom 0.5L for a matched organic duo covering both vegetative and flowering stages. Supplement with Power Roots during the first weeks for accelerated root mass development. If you require more volume, the 1L and 5L formats offer a progressively lower cost per litre.
Conclusion
Plagron Alga Grow 0.5L is the ideal mid-range entry point for organic vegetative nutrition. Order now from Plant & Flower for fast delivery across Belgium.
Technical specifications
| Primary elements (% w/w) | |
|---|---|
| Total nitrogen (Ntot) | 4.2% |
| Organic bound nitrogen (Norg) | 3.3% |
| Ammonium nitrogen (NH₄-N) | 0.9% |
| Phosphorus pentoxide (P₂O₅) | 2.4% (water-soluble) |
| Potassium oxide (K₂O) | 4.3% (water-soluble) |
| Trace elements (% w/w) | |
| Boron (B) | 0.010% |
| Copper (Cu) | 0.002% |
| Iron (Fe) | 0.020% |
| Manganese (Mn) | 0.014% |
| Molybdenum (Mo) | 0.0005% |
| Zinc (Zn) | 0.006% |
| Physical and chemical properties | |
| Acidity (pH) | 5.5 |
| Conductivity (EC) | 29 mS/cm |
| Density | 1.26 g/mL |
| Form | Liquid |
| Colour | Dark brown |
| Odour | Molasses-specific |
| Foaming | None |
How many plants can Plagron Alga Grow 0.5L support?
At full dosage of 4 mL per litre, half a litre of concentrate yields up to 125 litres of nutrient solution. This typically supports three to six plants through a complete vegetative phase, depending on container size and irrigation frequency.
Is there any difference between Alga Grow 0.5L and larger formats?
There is no difference in formulation or concentration. The active ingredient profile is identical across all packaging sizes: 0.1L, 0.25L, 0.5L, 1L and 5L. The only variables are total volume and cost per litre, with larger formats generally offering better value.
Can Alga Grow 0.5L be used as a foliar feed?
Plagron indicates that Alga Grow can also be applied as a foliar spray. When used in this way, reduce the concentration below the standard root-drench dosage and apply during early morning or late evening hours to minimise the risk of photothermal leaf damage on wet foliage.
