Soluble powder organic bloom fertiliser, NPK 3-6-9
Regular price
$13.00
Regular price
Sale price
$13.00
Unit price
/
per
| Format | Price | Price per kg | vs 100 g |
|---|---|---|---|
| 100 g | $13.00 | $130.00 | — |
| 500 g | $24.00 | $48.00 | −63 % |
| 1 kg | $44.00 | $44.00 | −66 % |
$4.33 × 3 with no fees
Klarna.
This organomineral flowering fertiliser in powder form, NPK 3-6-9, dissolves completely in water and supplies the phosphorus and potassium the plant needs to form its flowers and fill its fruit, along with calcium, magnesium, and sulphur. It is approved for use in organic farming.
It follows on from the growth version at pre-flowering and is used through to harvest, at 0.5 to 1.2 g per litre.
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The summary
- What you receive: a 100 g, 500 g, or 1 kg sachet of soluble powder.
- The period: from pre-flowering, mixed with the growth version, through to harvest.
- The dose: 1 to 1.2 g per litre for soilless flowering, 0.8 to 1 g in soil.
- The status: approved for organic farming, vegan formulation.
Complete organic powdered fertiliser for flowering and fruiting, suitable for use in organic farming
As the plant forms its first buds, it slows leaf production and draws more heavily on phosphorus and potassium. This soluble powder matches that shift with an NPK 3-6-9 formula, lower in nitrogen than the growth version NPK 7-2-8 and richer in phosphorus and potassium. It remains a complete fertiliser, with 4.6% calcium oxide, 3% magnesium oxide and 15% sulphur trioxide (SO3), so no additional fertiliser is needed during flowering.
🌼 From pre-flowering to harvest
During pre-flowering, dissolve 0.6 g of this powder and 0.6 g of the grow version per litre to ease the transition. Once flowering has begun, move to 1 to 1.2 g per litre in hydroponics and on coco fibre, then to 1.2 g during fruit ripening through to harvest. In soil, the doses are 0.5 g during pre-flowering, 0.8 to 1 g during flowering, and 1 g at the end of the cycle. The calcium in the formula contributes to building the cell walls of developing fruits.
Adding a seaweed extract during flowering
This powder supplies the nutrients, and a organic seaweed flowering stimulator can be added at 5 ml per litre, from pre-flowering through to ripening, in the same watering can. It is also approved for use in organic farming. This way you maintain a fully organic programme from planting to harvest.
Its nitrogen content, at 3.2%, is almost entirely plant-derived and must be mineralised by micro-organisms before it can be taken up. In living soil, the soil biology handles this; in biological hydroponics, the solution must be inoculated from the outset, for example with a powdered trichoderma. The phosphorus and potassium, at 6.3% and 9.1% respectively, are water-soluble and available to your plants more quickly, which suits a phase when their demands are rising fast.
Weigh the powder rather than measuring it by the spoonful
Between 0.5 and 1.2 g per litre, a measuring spoon error quickly doubles the dose, concentrating salts around the roots. Weigh the powder on a kitchen scale to the nearest gram, dissolve it completely before watering, and do not exceed 1.2 g per litre. Reseal the bag after use and store it in a dry place, between 5 and 30 °C.
🍅 A tomato plant in a pot
Take a tomato plant in a 20-litre pot, watered with 2 litres of solution every 2 days in summer. During flowering in soil, dissolve 2 g of powder in a 2-litre watering can, that is 1 g per litre, using roughly 30 g over a month. The 500 g bag therefore covers 4 plants over 4 months of flowering and fruiting, while the 100 g bag lets you try the fertiliser on a single plant.
📦 Three formats
At 1.2 g per litre, the highest dose, a 100 g sachet prepares approximately 83 litres of solution, a 500 g sachet approximately 415 litres, and a 1 kg sachet approximately 830 litres. The fertiliser complies with EU regulations 2018/848 and 2021/1165 on organic farming and with EU regulation 2019/1009 as a solid organo-mineral fertiliser. Its formulation is vegan, it is manufactured in France, and it should be used within 2 years of production.
Technical specifications
The composition
- NPK
- 3-6-9
- Organic nitrogen
- 2.8 %Plant-based, with 3.2% total nitrogen
- Calcium and magnesium
- 4.6% CaO, 3% MgO
- Sulphur
- 15 % of SO3
Use
- Pre-flowering
- 0.6 g/LWith 0.6 g/L of the growth version
- Flowering
- 1 to 1.2 g/L0.8 to 1 g/L in soil
- Ripening
- 1.2 g/L1 g/L in soil
- Crops
- Soil, coco fibre, organic hydroponics
The sachet
- Formats
- 100 g, 500 g, 1 kg
- Standard
- Regulation (EU) 2019/1009Solid organo-mineral fertiliser, PFC 1.B
- Organic farming
- Suitable for useRegulations (EU) 2018/848 and 2021/1165
- Hazard classification
- Uncategorised
To budget for separately
- Growth version
- The 7-2-8 organic grow fertiliser
- Bloom stimulator
- An organic seaweed extract
6 further specifications are available in the detailed view.
In the box
- 1 sachet of 100 g, 500 g or 1 kg, depending on the size chosen
Composition sourced from two of the manufacturer's retailers. Doses, standard and storage: manufacturer's datasheet, 2025 application chart and safety data sheet dated 03/02/2026, all sourced on 02/10/2026.
Documents & manuals
Safety data sheet for the organic bloom fertiliser
The data sheet details the composition, storage and first-aid measures for the powder.
Document not showing? Some publishers block display inside a frame, so open it in a tab.
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Sachet dispatched by tracked parcel from France. Exact shipping costs and final delivery times are displayed at checkout once your address has been entered. Outside the European Union, import duties and taxes are the responsibility of the recipient.
Frequently asked questions
6 questions
6 key questions
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