Container of TriPart Bloom by Terra Aquatica, flowering fertiliser, on a white background

The complete TriPart range: Grow, Bloom, Micro soft water and Micro hard water

TriPart application chart for hydroponics and coco fibre

TriPart application chart for soil growing

TriPart Bloom flowering fertiliser

$10.00

Capacity	Price	Price per L	vs 500 ml
500 ml	$10.00	$20.00	—
1 L	$15.00	$15.00	−25 %
5 L	$47.00	$9.40	−53 %
10 L	$86.00	$8.60	−57 %
60 L	$434.00	$7.23	−64 %

$3.33 × 3 with no fees Klarna.

This liquid mineral flowering fertiliser, with a NPK 0-5-4 formula and no nitrogen, delivers the phosphorus needed for flower initiation and the potassium for fruit fill, along with 3% magnesium and 5% sulphur. It forms the third part of the TriPart system, for use in hydroponics, coco fibre and soil.

Ref. TA-TPB-500·Hydroponic fertiliser

Capacity : 500 ml

500 ml

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The summary

What it is: a liquid mineral fertiliser NPK 0-5-4, rich in magnesium and sulphur, and the third part of the TriPart system.
When it comes into play: present from the first roots at a low dose, it becomes dominant at flowering, where it reaches 2.4 ml per litre.
How much to use: 2.4 ml per litre in hydroponic flowering, 2.1 ml per litre in soil. The calculator converts for your reservoir.
Zero nitrogen — why: nitrogen stimulates leaf growth at the expense of flowers. That role belongs to the Grow, which is reduced at this stage.
Suitable crops: tomato, strawberry, pepper, aubergine, cucumber — anything harvested as fruit.
Sizes and dispatch: 500 ml, 1 L, 5 L, 10 L, or 60 L, dispatched from France.

Phosphorus, potassium, magnesium and sulphur, nitrogen-free, for flowering

TriPart Bloom is the flowering fertiliser in the TriPart system, a liquid mineral fertiliser with an NPK formula of 0-5-4, enriched with magnesium and sulphur. It is the former FloraBloom, with only the label changed. During flowering, the plant requires phosphorus to form its buds and potassium to fill its fruits, and no longer needs nitrogen in significant quantities.

🌸 The moment of the first Bloom

A plant doesn't switch overnight from vegetative growth to flowering, it gradually builds up the reserves that will support its blooms, and phosphorus plays a role from the very moment of rooting. Bloom therefore accompanies the entire cycle at a dose that varies considerably, rather than being introduced from a set date. It is the ratio between the three parts that changes, never the presence of any one of them.

🍅 Switching between Grow and Bloom

In growth

Grow leads at 1.8 ml per litre, Bloom stays back at 0.6. The plant is producing leaves and stems.

In pre-flowering

All three are close, around 1.5 to 2 ml per litre. The target pH moves to 6.4–6.8.

In flowering

Bloom moves to the front at 2.4 ml per litre, Grow drops back to 0.8. In soil, allow 2.1 ml per litre.

Before concluding there is a deficiency and increasing the dose, check the pH of your reservoir. From pre-flowering onwards, the target pH shifts to 6.4 to 6.8, and outside this range phosphorus binds to the calcium or iron in the solution, making it unavailable even though it is present. This mistake leads to overdosing an element that is already in the solution. Our article on pH regulation explains how to keep it in check.

Bloom is added from the first week

Waiting for the first flowers to appear before starting Bloom means intervening too late, as the plant builds its roots and phosphorus reserves well before that point. At the first roots, the dose to add is 0.5 ml per litre, and it never drops to zero. What changes throughout the cycle is simply the ratio with Grow, a late catch-up can never replace a regular supply from the very start.

The trio that Bloom completes

Bloom does not make up a complete solution on its own. Choose TriPart Micro in the version that matches your water, and TriPart Grow, which stays in use right through to harvest. Grow supplies the nitrogen that Bloom does not contain, and Micro provides the iron, calcium and trace elements.

🧪 Magnesium and sulphur

Beyond phosphorus and potassium, the formula contains two elements that are often overlooked but make a real difference here. Magnesium, at 3%, is the atom at the heart of chlorophyll, and plants in full fruiting quickly run short of it, something you will notice on the lower leaves, where the blade yellows between veins that remain green. Sulphur, at 5%, is involved in the production of amino acids and aromatic compounds, and its effect shows less in plant vigour than in the flavour of what you harvest.

📦 Sizes and storage

On a fruiting crop, where flowering lasts several months, the Bloom is consumed more quickly than the Grow, since its dose is multiplied by four between the growth and flowering stages while the Grow dose drops by more than half. A set of three bottles of equal size therefore becomes unbalanced with use, and it is often sensible to buy the Bloom in a larger size than the other two. Keep the bottles sealed, away from light and frost: the concentrate keeps for 5 years after opening. Any sediment that appears after cold storage redissolves with a simple shake, without any deterioration in the product.

Technical specifications

The essentials

Formula: NPK 0-5-4No nitrogen. Phosphorus and potassium are the two drivers of flowering and fruiting.
Role in the system: Flowering partPresent at every stage, dominant from flowering onwards.
Flowering dose: 2.4 ml per litreHydroponics and coco. In soil, 2.1 ml per litre.
Growth dose: 0.6 ml per litreIts dose never drops to zero, even when Grow is dominant.

Magnesium and sulphur

Magnesium: 3% MgOThe central atom of chlorophyll. A deficiency shows on the lower leaves, which turn yellow between the veins.
Sulphur: 5% SO3Involved in amino acids and aromatic compounds. This is the part of the formula that influences flavour.

Parameters and safety

Target pH during flowering: 6.4 to 6.8Higher than in growth, where the target is 5.5 to 6.5.
Appearance: Pink liquid, odourlessThe colour prevents mixing up the containers when measuring out doses.
Regulatory classification: Not classified as hazardousNo hazard pictograms, no warning statements. Safety advice P101 and P102.
Storage: Upright, sealed, in a cool placeStore in a cool, dry, well-ventilated place away from foodstuffs. A crystalline deposit indicates storage at too low a temperature.

To budget for separately

TriPart Micro: Soft water or hard waterIt carries iron and calcium, which are absent from the other two parts.
TriPart Grow: 1 growth bottleIt stays at 0.8 ml per litre throughout flowering.

4 further specifications are available in the detailed view.

In the box

1 bottle of TriPart Bloom in your chosen size: 500 ml, 1 L, 5 L, 10 L or 60 L.

Formula 0-5-4, 5% P2O5, 4% K2O, 3% MgO and 5% SO3: label and official Terra Aquatica website. pH of the concentrate, density, appearance and classification: French safety data sheet, version 7 dated 26 December 2023. Dosages and pH ranges: application table, consulted on 10 September 2026.

Grow, Micro, Bloom: what each one does in the TriPart system

The three bottles are not interchangeable and none of them is used on its own. Bloom takes precedence during flowering and fruiting, while the Grow dose is reduced.

A flowering fertiliser added too early shows no effect whatsoever As long as the plant is producing leaves, it is a different bottle that takes the lead. The symptom you describe will tell you which one.

	Total nitrogen (%)	Phosphorus, P2O5 (%)	Potassium, K2O (%)	Supplies calcium and iron	Supplies magnesium	Available in soft water and hard water versions	First roots (ml/L)	Full growth (ml/L)	Pre-flowering (ml/L)	Flowering (ml/L)	Present at a high dose at every stage	Classified hazardous	Safety glasses required when measuring	Liquid colour	Previous name
TriPart GrowYour choice	3 %	1 %	6 %	No	Yes	No	0,5 ml/L	1,8 ml/L	2 ml/L	0,8 ml/L	No	No	No	Green	FloraGro
TriPart MicroYour choice	5 %	0 %	1 %	Yes	No	Yes	0,5 ml/L	1,2 ml/L	2 ml/L	1,6 ml/L	Yes	Yes	Yes	Dark brown	FloraMicro
Recommended TriPart BloomYour choice	0 %	5 %	4 %	No	Yes	No	0,5 ml/L	0,6 ml/L	1,5 ml/L	2,4 ml/L	No	No	No	Pink	FloraBloom

TriPart Grow

Formula declared on the label

Total nitrogen (%)3 %

Phosphorus, P2O5 (%)1 %

Potassium, K2O (%)6 %

Supplies calcium and ironNo

Supplies magnesiumYes

Available in soft water and hard water versionsNo

Hydroponic dosage, millilitres per litre

First roots (ml/L)0,5 ml/L

Full growth (ml/L)1,8 ml/L

Pre-flowering (ml/L)2 ml/L

Flowering (ml/L)0,8 ml/L

Use and safety

Present at a high dose at every stageNo

Classified hazardousNo

Safety glasses required when measuringNo

Liquid colourGreen

Previous nameFloraGro

TriPart Micro

Formula declared on the label

Total nitrogen (%)5 %

Phosphorus, P2O5 (%)0 %

Potassium, K2O (%)1 %

Supplies calcium and ironYes

Supplies magnesiumNo

Available in soft water and hard water versionsYes

Hydroponic dosage, millilitres per litre

First roots (ml/L)0,5 ml/L

Full growth (ml/L)1,2 ml/L

Pre-flowering (ml/L)2 ml/L

Flowering (ml/L)1,6 ml/L

Use and safety

Present at a high dose at every stageYes

Classified hazardousYes

Safety glasses required when measuringYes

Liquid colourDark brown

Previous nameFloraMicro

TriPart BloomRecommended

Formula declared on the label

Total nitrogen (%)0 %

Phosphorus, P2O5 (%)5 %

Potassium, K2O (%)4 %

Supplies calcium and ironNo

Supplies magnesiumYes

Available in soft water and hard water versionsNo

Hydroponic dosage, millilitres per litre

First roots (ml/L)0,5 ml/L

Full growth (ml/L)0,6 ml/L

Pre-flowering (ml/L)1,5 ml/L

Flowering (ml/L)2,4 ml/L

Use and safety

Present at a high dose at every stageNo

Classified hazardousNo

Safety glasses required when measuringNo

Liquid colourPink

Previous nameFloraBloom

Formulas recorded from the labels on the containers; classifications from the French safety data sheets. Dosages taken from the 2025 application chart, hydroponics and coco coir column. Values recorded on 10 September 2026.

Documents & manuals

TriPart application chart, hydroponics, coco and soil, multilingual document

The official schedule, stage by stage, in millilitres per litre for Grow, Micro, and Bloom, with conductivity and pH ranges. A single file, available in several languages including French.

PDF · 4

Download

Safety data sheet for TriPart Bloom, in French

Version 7 dated 26 December 2023. Regulatory classification, physico-chemical properties, storage instructions and first aid measures.

PDF · 4

Download

Safety data sheet TriPart Bloom, in English

The same safety data sheet in English, version 7 dated 26 December 2023, for a non-French-speaking contact.

PDF · 4

Download

Estimate your
delivery time

Liquid not classified as dangerous for transport, dispatched by tracked parcel from France. Weight ranges from approximately 600 grams for the 500 ml to approximately 12 kilos for the 10 L: exact shipping costs and delivery times are displayed at checkout once your address has been entered. Outside the European Union, import duties and taxes remain the responsibility of the recipient.

Frequently asked questions

6 questions

6 key questions

How much TriPart Bloom for 10 litres of water, and from which stage?

24 mlhydro and coco

21 mlin soil

6 mlin growth

The difference between 6 and 24 ml is the whole point of the system. Bloom is added from the first roots, at 0.5 ml per litre, not on the day the flowers appear — by that point the plant has already built the tissue that supports them. What changes through the cycle is the ratio between the three parts. Used alone, without Micro, the solution contains no iron, calcium, or trace elements, and deficiencies will appear within a few weeks.

Why does TriPart Bloom contain no nitrogen?

Because nitrogen stimulates leaf production. A plant receiving high levels of nitrogen during flowering will keep producing foliage instead of filling out its fruits.

The zero in the formula does not mean the plant no longer needs nitrogen during flowering. It still receives some, through the Grow maintained at 0.8 ml per litre and through the Micro. Bloom simply does not supply any, so that the adjustment can be made elsewhere.

Two less-discussed elements do a great deal of work here: magnesium, 3% MgO, the atom at the centre of the chlorophyll molecule, whose deficiency causes the lower leaves to yellow between the veins, and sulphur, 5% SO3, which is involved in two amino acids and in aromatic compounds — in other words, in flavour and aroma.

What dose at each stage, and on which crops does Bloom actually make a real difference?

Values are in millilitres per litre of solution, for Bloom alone. Grow and Micro are dosed alongside it.

Stage	Hydro and coco	Soil	Target pH
First roots	0,5	0,2	5.5 to 6.5
First true leaves	1	0,6	5.5 to 6.5
Growth	0,6	0,5	5.5 to 6.5
Pre-flowering	1,5	1	6.4 to 6.8
Flowering	2,4	2,1	6.4 to 6.8

Note the upward shift in target pH from pre-flowering onwards. Grow never stops: it drops back to 0.8 ml per litre and stays in the schedule right through to harvest.

Bloom comes into its own with crops harvested for their fruit.

Crop	Flowering dose	What you'll notice
Tomato	2,4 ml/L	It fruits for 3 to 4 months continuously and potassium demand doesn't drop off between trusses.
Strawberry	2,4 ml/L	It produces in successive flushes and draws on its reserves with each one.
Pepper	2,4 ml/L	It flowers and sets fruit continuously throughout summer, with no rest period.
Aubergine	2,4 ml/L	Large fruits that swell quickly once set, with high demand concentrated over just a few weeks.
Cucumber	2,4 ml/L	Continuous harvest and high water consumption: keep a close eye on conductivity, which can shift rapidly.
Lettuce, spinach	0,5 à 0,6 ml/L	Harvested for their leaves, they never reach meaningful flowering.
Basil, rocket	0,5 à 0,6 ml/L	Here, flowering is precisely what you want to delay, as it hardens the flavour of the leaves.

An additional PK booster only makes sense if your conductivity remains low towards the end of the cycle: the target range during flowering is 1.4 to 2.2 mS, and it's that figure which tells you whether there's room, not how the flowers look. Our article on 15 plants to grow helps you put together a system where Bloom is genuinely useful.

My stems are taking on a purplish tinge — is this a phosphorus deficiency?

Not necessarily. A purplish tinge on the stems may simply be a varietal characteristic or a response to cold nights, with no connection to nutrition.

Phosphorus deficiency: leaves take on an unusually dark green colour, then purplish tints appear on the undersides of the veins. Flowering is delayed and buds remain small. The symptom starts on the oldest leaves.
Potassium deficiency: the edges of older leaves turn brown and dry out, leaving the centre of the blade green. Fruits remain small and soft, and ripen unevenly from one side to the other.

In both cases, check the pH before adjusting your dosage: our guide to micro-deficiencies shows the symptoms in images.

Does Bloom have a place in an aquaponic tank, or in a soil-based vegetable garden?

On a system without fish, or on a decoupled loop where plants receive their own solution, yes, just as in conventional hydroponics. On a stocked pond, a separate product is formulated for this purpose — the Aquaponic Mix — designed to supplement the mineralisation from fish waste without upsetting the water balance: that is the one to use as soon as fish are sharing the circuit.

In soil, yes too, using the dedicated column in the application chart, from 0.2 ml per litre at the first roots up to 2.1 ml during flowering: the soil itself retains and releases some of the elements. On a living, already fertile soil, supplementing is most justified at full fruiting, when potassium demand exceeds what the soil releases on its own. Finish the cycle with plain water, as the chart indicates under the flush stage.

Which Bloom size should you choose?

Size	What it covers, at the flowering dose
500 ml	Approximately 210 L of solution.
1 L	Approximately 415 L. The right size for a home setup.
5 L	Approximately 2,080 L.
10 L	Approximately 4,165 L.
60 L	Approximately 25,000 L, for professional growers.

These volumes are calculated at 2.4 ml per litre. Over a full cycle, where Bloom spends most of its time between 0.5 and 1.5 ml, a bottle lasts considerably longer than this table suggests.

It is the most straightforward of the three bottles in the system: its safety data sheet does not classify it as hazardous — no hazard pictogram, no warning statement — whereas Micro requires eye protection. It remains a concentrated fertiliser: keep it out of reach of children and away from food. A crystalline deposit at the bottom is the result of storage in cold conditions; bring the bottle back to room temperature and shake until the deposit has completely dissolved, otherwise each millilitre drawn off will be weaker than intended.

How much TriPart Bloom for your reservoir

Enter the water volume of your reservoir. The calculation applies the flowering dose for hydroponics and coco coir, 2.4 ml per litre.

Reservoir water volume

5 L1000 L

0ml

of TriPart Bloom, the flowering nutrient for hydroponics and coco fibre

Same stage, but in soil

0 ml

This dose applies to the flowering stage. During growth, the Bloom drops to 0.6 ml per litre, and at first root development to 0.5. It is always used alongside the Grow and Micro, never on its own. During flowering, the target conductivity is 1.4 to 2.2 mS and pH 6.4 to 6.8.

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TriPart Bloom flowering fertiliser

The summary