Late-flowering fertiliser in powder form, soluble PK
Regular price
$12.00
Regular price
Sale price
$12.00
Unit price
/
per
| Packaging | Price | Price per kg | vs 100 g |
|---|---|---|---|
| 100 g | $12.00 | $120.00 | — |
| 500 g | $27.00 | $54.00 | −55 % |
$4.00 × 3 with no fees
Klarna.
This highly concentrated phosphorus and potassium mineral fertiliser powder replaces your usual fertiliser during the last 20 days before harvest. It is dosed at 2 g per litre in hydroponics and coco fibre, and at 1.5 g per litre in soil.
The 100 g sachet makes 50 litres of solution; the 500 g sachet makes 250 litres.
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The summary
- What you receive: a resealable bag of 100 g or 500 g of soluble powder.
- The dose: 2 g per litre in hydroponics and on coco coir, 1.5 g per litre in soil, used alone.
- The timing: the final 20 days before harvest, in place of your flowering fertiliser.
- The composition: 42% soluble phosphoric anhydride, with potassium, magnesium, and sulphur.
Phosphorus- and potassium-rich soluble fertiliser for the ripening of flowers and fruit
At the end of flowering, a plant has almost no need for nitrogen: it is finishing off its flowers and fruit, which calls mainly for phosphorus and potassium. This powdered fertiliser meets that need with a content of 42% water-soluble phosphoric anhydride and very little nitrogen. Use it on its own during the final 20 days before harvest, 2 g per litre in hydroponics and on coco coir, or 1.5 g per litre in soil. It replaces your bloom fertiliser at that stage, whatever brand you normally use.
🌸 For ripening
Phosphorus is involved in energy transfer within cells and in the formation of flowers and seeds, while potassium regulates the movement of water and sugars towards the fruit. By sharply reducing nitrogen and increasing these two elements, the fertiliser directs the plant towards ripening rather than leaf production. It is used on fruiting vegetables such as tomatoes, peppers and strawberries, on ornamental flowering plants, and on herbs grown for their flowers.
Rinse the grow medium before you start
By the time you move on to a late-flowering fertiliser, the grow medium often contains salts that have built up over the course of the grow. An application of FlashClean grow medium regenerator just before the first watering puts them back into solution and flushes them out, allowing the roots to take up phosphorus more effectively afterwards. The same product is used again in the final days of the grow for the end flush.
The powder is very fine, 100% passes through a 1 mm mesh sieve, and dissolves completely in water. A sachet of powder can be transported without any risk of leakage, and a kitchen scale accurate to the gram is all you need to weigh out the dose. Pour the powder into the water while stirring, then measure and adjust the pH of the resulting solution.
Check the pH of the solution
The powder is acidic, with a pH of between 3 and 4, so it will lower the pH of your solution. Measure it after dissolving with a drop-based pH test, then bring it back to between 5.5 and 6.5 for hydroponics. Do not use this product alongside another end-of-cycle fertiliser, as the phosphorus levels would compound. Reseal the bag after use, as the powder absorbs moisture.
⚖️ Powder or liquid
There are two end-of-flowering fertilisers in this range, to be used one or the other, never together. The liquid FinalPart, with an NPK formula of 0-6-5, is dosed at 5 ml per litre and takes over from a liquid bottle-based programme. This powder, considerably more concentrated, fits into a lightweight sachet and works well if you already grow using a powdered fertiliser. FinalPart is used over the last 10 to 15 days; this powder over the last 20.
📦 Two sachets
The 100 g packet makes 50 litres of solution at 2 g per litre, covering the end of cycle for your potted plants or a small hydroponic system. The 500 g packet makes 250 litres, suitable for a reservoir refreshed weekly or an entire greenhouse. The powder keeps for 2 years from manufacture, stored dry with the packet well sealed. This is a mineral fertiliser compliant with regulation (EU) 2019/1009, manufactured in France, and is not suitable for organic farming.
Technical specifications
The composition
- NPK
- 2-42-20
- Soluble phosphoric anhydride
- 42 %
- Magnesium oxide
- 1 %
- Sulphur trioxide
- 4 %
Use
- Dose
- 2 g/L1,5 g/L in soil
- Period
- 20 final days before harvest
- Crops
- Soil, coco, hydroponics
- Organic farming
- Non
The sachet
- Formats
- 100 g, 500 g
- Prepared solution
- 50 L or 250 L
- Standard
- Regulation (EU) 2019/1009Compound solid inorganic fertiliser
- Storage
- 2 years after manufacture
To budget for separately
- pH measurement
- A pH test kit in drops
- Rinsing the grow medium
- A grow medium revitaliser
6 further specifications are available in the detailed view.
In the box
- 1 resealable sachet of 100 g or 500 g, depending on the size chosen
NPK formula sourced from the front of the sachet and the manufacturer's datasheet. Doses, timing, pH and standard: manufacturer's datasheet, safety data sheet and 2025 application chart, all sourced on 02/10/2026.
HyperBloom or FinalPart: which end-of-cycle solution
The same step, two forms. The powder is weighed and lasts 20 days; the liquid is measured and lasts 10 to 15 days.
Powder or liquid for the final days
HyperBloom is weighed to the gram and covers the final 20 days; FinalPart is measured with a dosing cup over 10 to 15 days. Three questions are all you need.
| Shape | Phosphorus, P2O5 (%) | Potassium, K2O, in NPK (%) | Nitrogen, in NPK (%) | How long before harvest can it be used? (days) | Dose in hydroponics and on coco fibre | Soil dose | Weighing on scales | Solution prepared using the smallest format (L) | Service life | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Late-flowering fertiliser without nitrogen, NPK 0-6-5Your choice | Liquid | 6 % | 5 % | 0 % | 10 to 15 days | 5 ml/L | 4 ml/L | No | 100 L | 5 years after opening | $10.00 |
| Recommended HyperBloomYour choice | Soluble powder | 42 % | 20 % | 2 % | 20 days | 2 g/L | 1,5 g/L | Yes | 50 L | 2 years after manufacture | $12.00 |
Late-flowering fertiliser without nitrogen, NPK 0-6-5
Formula
ShapeLiquid
Phosphorus, P2O5 (%)6 %
Potassium, K2O, in NPK (%)5 %
Nitrogen, in NPK (%)0 %
Use
How long before harvest can it be used? (days)10 to 15 days
Dose in hydroponics and on coco fibre5 ml/L
Soil dose4 ml/L
Weighing on scalesNo
Solution prepared using the smallest format (L)100 L
Service life5 years after opening
Price
HyperBloomRecommended
Formula
ShapeSoluble powder
Phosphorus, P2O5 (%)42 %
Potassium, K2O, in NPK (%)20 %
Nitrogen, in NPK (%)2 %
Use
How long before harvest can it be used? (days)20 days
Dose in hydroponics and on coco fibre2 g/L
Soil dose1,5 g/L
Weighing on scalesYes
Solution prepared using the smallest format (L)50 L
Service life2 years after manufacture
Price
Formulas, doses, application periods and shelf life: official Terra Aquatica FinalPart and HyperBloom data sheets, recorded on 7 October 2026.
Help choosing
Powder or liquid for your final days
Documents & manuals
Safety data sheet for the powdered fertiliser
The data sheet details the composition, pH and storage precautions 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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