Sachet of StreptoLogic, a powdered microbial biostimulant, front view on a white background

Diagram of the dosage of 1 g per 10 litres and of the volume of solution prepared by each size

Diagram of the four micro-organisms in the powder: three bacteria and a mycorrhizal fungus

New kraft packaging for StreptoLogic, sachet with a purple band and growing pictograms

Microbial biostimulant with Streptomyces and mycorrhiza in powder form

16,90 €

Format	Price	Price per kg	vs 10 g
10 g	16,90 €	1.690,00 €	—
50 g	66,90 €	1.338,00 €	−21 %
400 g	359,90 €	899,75 €	−47 %
1.66 kg	1.212,90 €	730,66 €	−57 %
3.5 kg	2.421,90 €	691,97 €	−59 %

5,63 € × 3 with no fees Klarna.

This powdered biostimulant combines three bacteria and a mycorrhizal fungus, which attach directly to the roots in soil, in coco fibre and in hydroponics. It is dosed at 1 g per 10 litres, every 6 to 8 weeks, preferably before hot weather, and it can be used in organic farming.

Ref. XXBA02001·Biostimulant

Format : 10 g

400 g

1.66 kg

3.5 kg

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The summary

What you receive: a powder combining 3 bacteria and 1 mycorrhizal fungus, from 10 g to 3.5 kg.
The dose: 1 g per 10 litres of water or nutrient solution, every 6 to 8 weeks.
The right moment: as a preventive measure, before the hot spells that weaken roots.
In hydroponics: no biofilter, and a fresh application at every change of solution.
How to choose: four micro-organisms combined here, against just one in the Trichoderma or Azospirillum of the same range.
In organic farming: usable, under Regulations (EU) 2018/848 and 2021/1165.

Bacteria and mycorrhizae in powder form to protect the roots during hot spells

This powder biostimulant combines three bacteria and one mycorrhizal fungus, which settle in the root zone of your crops. The three bacteria, Streptomyces beta-vulgaris, Bacillus megaterium and a strain of Burkholderia, are each guaranteed at 100 million colony-forming units per gram. The fungus, Rhizophagus irregularis, forms a symbiosis with the roots. Once diluted in the watering water or in the reservoir, the powder attaches directly to the roots, so you do not need any biofilter, even in hydroponics. The product can be used in organic farming.

🧫 What these micro-organisms do

The four micro-organisms act in four distinct ways, and iron mobilisation is the one whose effect shows most directly on the foliage, because this element is involved in chlorophyll synthesis, in cellular respiration and in the uptake of other nutrients. Yet a good part of the iron in the medium stays in an insoluble form that the roots cannot absorb. The siderophores produced by the bacteria bind this iron and make it available to the plant. If the young leaves of your plants turn pale between veins that stay green, our guide to iron deficiency will help you confirm the diagnosis before you act.

Phytohormones

The micro-organisms produce plant hormones that stimulate root growth and then encourage flowering.

Iron made available

The bacteria release siderophores, molecules that capture the insoluble iron in the medium and make it available in a chelated form.

Carbon for the soil

As they break down organic matter, the bacteria release the carbon that the rest of the microbial life in the grow medium feeds on.

A root symbiosis

Rhizophagus irregularis associates with the roots and improves nutrient uptake, including when the plant is under stress.

An organic fertiliser to feed the bacteria

The bacteria in StreptoLogic break down organic matter, so an organic fertiliser supplies the resource that sustains their activity. The liquid organic growth fertiliser from the same range goes into the same water as the powder, each at its own dose. In organic growing, whether in soil or in bioponics, you feed both the plant and the microbial life with a single watering.

🌞 A top-up before the hot weather

When the temperature rises, the amount of oxygen dissolved in the water and in the soil falls, while the plant's needs increase. This imbalance causes water and oxidative stress that exposes the roots to pathogens such as Pythium, Fusarium and Verticillium, whose spread speeds up in hot weather. StreptoLogic is therefore used preventively: the beneficial populations need time to multiply, and you add them before the heat episode rather than when symptoms appear. The dose is 1 g per 10 litres of water or nutrient solution. You then repeat the application every 6 to 8 weeks, in pots as well as in hydroponics.

Pre-mix the powder before using a drip system

The powder contains diatomaceous earth, which provides silicon but forms a sediment in the water. In a system fitted with drippers or fine tubing, this sediment can clog the small passages. In that case, mix the dose with water, with the pump running, for 24 hours, then collect the liquid part and compost the sediment. Never leave this mixture for more than 24 hours without oxygenation.

🧪 In a reservoir, without a biofilter

In hydroponics, you dissolve the powder directly in the reservoir, at the same dose of 1 g per 10 litres. Like all aerobic micro-organisms, those in StreptoLogic work best when the solution is well oxygenated and its pH, temperature and humidity remain stable. An air diffuser maintains oxygenation, while a pH drop test lets you check the acidity of the solution. A drain-down, however, washes away the established population, so each new solution receives its own dose. In bioponics, where the nitrogen in an organic fertiliser must be mineralised before it can be absorbed, the activity of the bacteria helps keep the solution alive.

📦 Five powder sizes

The 10 g sachet makes up 100 litres of solution, which is enough for a household tank or for watering a few pots. The 50 g one makes up 500 litres and covers a crop followed over several months. The 400 g, 1.66 kg and 3.5 kg packs are aimed more at greenhouses and farms. In open fields, the dose is 0.5 kg per hectare, and you should not exceed 2 applications per year. The powder keeps for 18 months from manufacture, in the dry, in its sealed packaging, ideally between 5 and 25 °C. If you are hesitating between Trichoderma powder and Azospirillum powder, the comparison of the three biostimulants sets out their doses and schedules.

Technical specifications

The composition

Micro-organisms: 3 bacteria and 1 mycorrhizal fungusStreptomyces beta-vulgaris, Bacillus megaterium, Burkholderia sp. and Rhizophagus irregularis
Strains: B11, AGNO1, AGNO2 and DAOM
Concentration: 100 million CFU/g per bacterium
Organic farming: Suitable for useRegulations (EU) 2018/848 and 2021/1165

Use

Dose in solution: 1 g per 10 LThat is 0.1 g per litre, in hydroponics, on coco fibre and in soil
Rhythm: Every 6 to 8 weeksIn hydroponics, a fresh dose with every change of solution
Open ground: 0.5 kg per hectareTwo applications a year at most
Incompatibilities: Fungicides, acids, disinfectantsThe Silicate is used alongside as a spray or applied dry at the base of the stem, never dissolved in the grow medium

The powder

Mineral component: Diatomaceous earthIt supplies silicon and forms a deposit in fine tubing
Storage: 18 months from manufactureDry, in its sealed packaging, ideally between 5 and 25 °C
Hazard classification: Not classified as hazardousGloves and goggles recommended, as the micro-organisms can cause sensitisation
Origin: France

To budget for separately

Fertilizer: An organic liquid fertiliser
pH control: A pH test kit in drops

6 further specifications are available in the detailed view.

In the box

10 g to 3.5 kg of StreptoLogic powder, depending on the size chosen

Composition, concentrations, doses, schedules and storage recorded on 05/10/2026 from the shop and the manufacturer's website, its 2025 application table and its safety data sheet.

One fungus, one bacterium or four micro-organisms?

The three powdered microbial biostimulants in the range are not dosed or renewed in the same way. What sets them apart is, first of all, the number of organisms delivered to the roots.

A single strain, or four micro-organisms? Two questions about your roots and your feeding rhythm are enough to identify the right powder.

	Organisms introduced	Strains	Concentration per counted strain (million CFU/g)	Mycorrhizal fungus	Dose in solution (g/L)	Feeding schedule	Suitable for organic farming	Price
Recommended Microbial biostimulant with StreptomycesYour choice	Three bacteria and one mycorrhizal fungus	4	100 million CFU/g	Yes	0,1 g/L	Every 6 to 8 weeks	Yes	16,90 €
Trichoderma powder for roots, from 10 g to 5 kgYour choice	Trichoderma harzianum fungus	1	100 million CFU/g	No	0,1 g/L	Every 6 to 8 weeks	Yes	5,90 €
Azospirillum microbial biostimulant in powder form, 10 g to 5 kgYour choice	Azospirillum sp. bacterium	1	10 million CFU/g	No	1 g/L	2 applications per year	Yes	11,90 €

Microbial biostimulant with StreptomycesRecommended

What the powder contains

Organisms introducedThree bacteria and one mycorrhizal fungus

Strains4

Concentration per counted strain (million CFU/g)100 million CFU/g

Mycorrhizal fungusYes

Use

Dose in solution (g/L)0,1 g/L

Feeding scheduleEvery 6 to 8 weeks

Suitable for organic farmingYes

Trichoderma powder for roots, from 10 g to 5 kg

What the powder contains

Organisms introducedTrichoderma harzianum fungus

Strains1

Concentration per counted strain (million CFU/g)100 million CFU/g

Mycorrhizal fungusNo

Use

Dose in solution (g/L)0,1 g/L

Feeding scheduleEvery 6 to 8 weeks

Suitable for organic farmingYes

Azospirillum microbial biostimulant in powder form, 10 g to 5 kg

What the powder contains

Organisms introducedAzospirillum sp. bacterium

Strains1

Concentration per counted strain (million CFU/g)10 million CFU/g

Mycorrhizal fungusNo

Use

Dose in solution (g/L)1 g/L

Feeding schedule2 applications per year

Suitable for organic farmingYes

Compositions, doses and schedules recorded from the three sheets on 05/10/2026. Sheets compared: Trichoderma powder for roots, from 10 g to 5 kg, and Azospirillum microbial biostimulant powder, 10 g to 5 kg.

Estimate your
delivery time

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

8 questions

6 key questions, 8 in the detailed view

Does hydroponics need a biofilter?

How much for a 60-litre sump tank?

At what stage of the crop should it be applied?

The first application is made as soon as the first roots appear, at sowing or at cutting stage, then the application is repeated during growth, every 6 to 8 weeks.

You should also plan one before each spell of intense heat, because the beneficial populations need time to multiply before the temperature weakens the roots. On a long-term crop in a greenhouse, the schedule is therefore set first by the summer forecasts, then by the 6 to 8 week interval.

Do I need to add more after emptying the reservoir?

What precautions should be taken when handling the powder?

Can it be used with a drip irrigation system?

Can it be combined with Silicate or a fungicide?

Can it be used in a system with fish?

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Microbial biostimulant with Streptomyces and mycorrhiza in powder form

The summary