NPK 6.4 + 4.5 + 6.7
6.4% total nitrogen, including 0.4% nitrate nitrogen and 6.0% urea nitrogen. 4.5% water-soluble phosphate (P₂O₅) and 6.7% water-soluble potassium oxide (K₂O).
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GREEN24 · HYDRO
Hydroculture: plan mixture preparation and container feeding separately
This specialist pathway covers the described hydroculture with granules and a water-level indicator. Prepare the fertiliser mixture first. Determine how much of it goes into the container separately, using the product’s own hydro instructions.
No blanket approval for NFT, DWC or aeroponics. No automatic plant classification, EC or pH target, or calculation from plant height or reservoir size.
Your selected pack
- 250 ml hydroculture concentrate
- Prepare with 5 ml per 1.5 litres of water; determine container feeding separately.
- Calculated 75 litres of prepared mixture at the label recipe, not total reservoir capacity.
Calculated yield uses the label recipe and the water volume used to prepare the mixture. It is neither total reservoir capacity nor a number of applications.
Calculate the prepared mixture only
First determine how much prepared mixture you actually need. Enter its batch size in litres of water. The calculator supplies only the concentrate amount at 5 ml per 1.5 litres of water.
Concentrate to measure:
Not a reservoir calculator: do not automatically enter the whole container volume or the whole refill volume. Plain-water and prepared-mixture shares are explained separately below. Measure small concentrate quantities only with an appropriate precise measuring aid; otherwise prepare a larger batch.
Six steps for this hydro-specific pathway
Diagrams explain the sequence. Water-level marks are schematic, not a volume scale. Only the three refill bars show the expressly stated volume proportions.
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1. Check container, plant and residues
Check the container and water-level indicator. Account for previous fertiliser, plant-protection or cleaning residues; clean the container thoroughly and replace granules if needed. Do not feed during dormancy or the first two weeks after repotting or conversion.
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2. Prepare the mixture separately
Measure 5 ml concentrate for each 1.5 litres of water. Put water into a separate suitable vessel first, shake the bottle, add concentrate and mix thoroughly. This is not yet a reservoir concentration.
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3. First application: water to the middle mark
First add plain water to the middle mark of the hydro container’s indicator. It is a level mark, not an established 50-percent volume measurement.
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4. Add prepared mixture to maximum
Only then add already prepared mixture from the middle mark to the maximum mark. Determine actual quantities for the container; never pour in concentrate directly.
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5. Later refill by need and feeding category
When water is needed again, use plain water and prepared mixture in the three ratios below. Select the category for the particular plant; the calculator does not select it.
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6. Respect pauses and observe conditions
Respect dormancy and at least two weeks without fertiliser after repotting or conversion. Observe water level, growth, roots and existing nutrients; do not infer a universal winter schedule.
First application: follow marks, not percentages
First add plain water to the middle mark of the water-level indicator. Then add already prepared fertiliser mixture to the maximum mark. The middle mark is not proven to represent half the reservoir volume; actual quantities depend on the container. Never dose concentrate straight into the hydro container.
Subsequent refills: three categories from the original instructions
Only when water is needed again and outside feeding pauses. Select the feeding category for the particular plant on an informed basis. Shares refer to the replenishment volume, not the whole reservoir and never to concentrate. Add water first, followed by prepared mixture.
Light feeder
Plain water: 2/3
Prepared mixture: 1/3
Moderate feeder
Plain water: 1/2
Prepared mixture: 1/2
Heavy feeder
Plain water: 1/3
Prepared mixture: 2/3
If the appropriate category is uncertain, do not assume it automatically. First clarify plant needs, root condition, nutrients already present and water quality.
Feeding pauses and timing
Do not feed during dormancy. Directly after repotting or conversion to hydroculture, wait at least two weeks without fertiliser. Subsequently account for actual growth, root condition and nutrients already present.
Adjust timing to actual growth, water needs and nutrients already present. Do not feed during dormancy. Renewed water demand does not automatically call for another full fertiliser dose.
Understand the declared hydro formulation
Declared trace nutrients
B 0.0075%, Cu 0.003%, Fe 0.0150%, Mn 0.0090%, Mo 0.0008%, Zn 0.003%. Cu, Fe, Mn and Zn are declared as EDTA chelates.
Assess water separately
Product pH 6.9 describes the concentrate, not a guaranteed reservoir pH. Calcium and magnesium are not declared. No universal EC target or complete nutrient solution for arbitrary source water is established.
Application limits and storage
Shake before use and never apply undiluted. Store out of reach of children and animals, dry and dark, above 8 °C and no higher than 38 °C. The label recommends low-lime water or rainwater at 15–25 °C; separately check suitability for the crop. Do not apply in sun, below 5 °C or above 30 °C. Official advisory recommendations take precedence.
The product’s own instructions mention leaf feeding with prepared mixture for nutrient deficiency. This is not an automatic additional full feed with every container fill. This pathway does not enable a general foliar-dose calculator.
At a glance
Hydroculture Fertiliser
Liquid NPK concentrate for plants grown in hydroculture
- NPK declaration
- 6.4 + 4.5 + 6.7
With declared trace nutrients.
- Prepared mixture
- 5 ml per 1.5 l of water
Determine the subsequent container application separately.
- Growing method
- According to water demand
Account for water level and nutrients already present.
- After moving plants
- Pause for at least 2 weeks
Feeding pause from the product’s own hydro instructions.
Use the product’s own hydro instructions together with actual plant needs.
Original hydro instructions (German) Opens in a new window.The instructions here cover the described hydroculture with granules and a water-level indicator. They do not establish a complete recipe for every NFT, DWC or aeroponic system. Water quality, species, nutrient requirements and technical operation need to be matched separately.
Product information
Application & dilutionDistinguish preparation from refilling.
Label preparation: 5 ml concentrate per 1.5 litres of water. This describes preparation of the fertiliser mixture, not a universal concentration for every filled hydro container.
The product’s own hydroculture leaflet describes a container with a water-level indicator: for the first application, add plain water to the middle mark, then fill the remaining space to the maximum mark with the prepared mixture. Actual component volumes depend on the container. Do not fill the entire reservoir indiscriminately with concentrate or full-strength prepared mixture.
When water is needed again, the leaflet divides the refill volume as follows: light feeders, ⅔ water + ⅓ prepared fertiliser mixture; moderate feeders, ½ of each; heavy feeders, ⅓ water + ⅔ prepared fertiliser mixture. Select the category for the particular plant. These fractions refer to the mixture already prepared with 5 ml per 1.5 litres of water, never to the concentrate.
Do not feed during dormancy. After repotting or conversion to hydroculture, the product’s own leaflet specifies at least two weeks without fertiliser. Adjust subsequent care to growth, root condition and nutrients already available.
Mandatory application instructions
Label preparation: 5 ml concentrate per 1.5 litres of water. This describes preparation of the fertiliser mixture, not a universal concentration for every filled hydro container.
When water is needed again, the leaflet divides the refill volume as follows: light feeders, ⅔ water + ⅓ prepared fertiliser mixture; moderate feeders, ½ of each; heavy feeders, ⅓ water + ⅔ prepared fertiliser mixture. Select the category for the particular plant. These fractions refer to the mixture already prepared with 5 ml per 1.5 litres of water, never to the concentrate.
Do not feed during dormancy. After repotting or conversion to hydroculture, the product’s own leaflet specifies at least two weeks without fertiliser. Adjust subsequent care to growth, root condition and nutrients already available.
Please follow the product-specific information on the label and in the full description.
Original hydro instructions (German) ↗
The general information sheet describes liquid fertilizer concentrates. Ready-to-use and solid fertilizers have their own application instructions on the product label.
View the complete original hydro instructions Opens in a new window.
PropertiesProduct characteristics and guidance
The instructions here cover the described hydroculture with granules and a water-level indicator. They do not establish a complete recipe for every NFT, DWC or aeroponic system. Water quality, species, nutrient requirements and technical operation need to be matched separately.
- Net mass:290 g per 250 ml;1161 g perlitre according to the respective rear labels.
Nutrient compositionNPK 6.4+4.5+6.7
Product pH: 6.9. This describes the concentrate. Calcium and magnesium contents are not specified in this declaration; no complete recipe for arbitrary source water is inferred.
- 6.4% total nitrogen (N), including 0.4% nitrate nitrogen and 6.0% urea nitrogen.
- 4.5% water-soluble phosphate (P₂O₅).
- 6.7% water-soluble potassium oxide (K₂O).
- 0.0075% boron (B).
- 0.003% water-soluble copper (Cu), as EDTA chelate.
- 0.0150% iron (Fe), as EDTA chelate.
- 0.0090% manganese (Mn), as EDTA chelate.
- 0.0008% molybdenum (Mo).
- 0.003% water-soluble zinc (Zn), as EDTA chelate.
Mixing with other productsMixing, combining or applying separately
Using products as part of the same care routine is different from mixing them in one container. Follow the labels and application instructions of all products involved.
- Tank mixing: Combine products in a watering can or spray tank only when the manufacturer instructions confirm the specific combination and use. Do not mix undiluted concentrates together.
- Separate application: Applying products separately or at different times does not automatically establish compatibility. Check the species, location, plant condition and instructions for both products. No universal waiting period follows from this.
- Complementary products: A recommendation for suitable growing media, accessories or another care product does not mean that it may be mixed with the fertiliser.
- Plant protection products: The crop, target organism, application method and pack instructions must also be suitable. The fertiliser calculator does not calculate plant protection product quantities or confirm compatibility.
The recommendations cover products for different care tasks. Combining them in the same solution requires the instructions for both products to allow that combination. Otherwise, apply the products separately.
Pairs well with
Selected additions for your plant care.
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GREEN24
Expanded Clay 4–8 mm
From 6.95 €
( 1.39 €/ l)
Crushed expanded clay 4–8 mm for suitable soil-independent indoor cultures. Match particle size to container openings; manage water level and nutrients separately.
5 litres · 10 litres
Delivery time: In stock · 1–3 days (DE)
Incl. VAT, plus shipping costs
PRODUCT KNOWLEDGE
Hydroculture Fertiliser
Overview
Support roots and manage water
The photograph shows the product’s own crushed expanded clay. It is a possible companion for a suitable granular growing system. Water level and nutrients are managed separately from the bulk volume of material.
Details & background
Granules support the roots while water and nutrients are added deliberately. First dilute this hydroculture fertiliser with water. The amount of prepared mixture added to the container then depends on the plant, water already present and the product’s own hydroculture instructions.
The instructions here cover the described hydroculture with granules and a water-level indicator. They do not establish a complete recipe for every NFT, DWC or aeroponic system. Water quality, species, nutrient requirements and technical operation need to be matched separately.
Application
Prepare the mixture first
Label preparation: 5 ml concentrate per 1.5 litres of water. This describes preparation of the fertiliser mixture, not a universal concentration for every filled hydro container.
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Prepare equipment and instructions
Use clean measuring equipment and check the container’s water-level indicator. Account for residual nutrients or other residues; do not mix different concentrates without confirming compatibility.
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Calculate the prepared mixture
The product label specifies 5 ml per 1.5 litres of water. For example, measure 10 ml for 3 litres of water. This is the prepared mixture; the subsequent container dose is determined separately.
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Add water first
Put part of the intended water volume into a clean container. The label prefers low-lime water or rainwater at 15–25 °C. Water quality must also suit the crop.
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Shake and measure
Shake the bottle well and measure the required concentrate accurately. The checked front labels define one cap as 5 ml. Never put concentrate directly onto roots or leaves.
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Mix and identify
Add concentrate to the water, mix, and add the remainder of the intended water volume. Clearly identify the prepared mixture and use it promptly.
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Apply for the particular container
Distinguish the first application from later refills using the hydroculture instructions. Its fractions refer to this prepared mixture, not concentrate. Account for plant demand, fill level and the feeding pause after moving plants.
Refill according to demand
For later water refills, the proportion of prepared mixture varies with plant demand. The complete proportions appear under “Application & prepared mixture” in the product information. Check water level and growing conditions before each new application.
Nutrition & properties
Use this product’s own label
The instructions here cover the described hydroculture with granules and a water-level indicator. They do not establish a complete recipe for every NFT, DWC or aeroponic system. Water quality, species, nutrient requirements and technical operation need to be matched separately.
Details & background
Feed through the hydro container
The product’s own hydroculture leaflet describes a container with a water-level indicator: for the first application, add plain water to the middle mark, then fill the remaining space to the maximum mark with the prepared mixture. Actual component volumes depend on the container. Do not fill the entire reservoir indiscriminately with concentrate or full-strength prepared mixture.
Choose foliar feeding selectively
The label permits spraying foliage. First check species, leaf surfaces and conditions; avoid open flowers. This is not a second full nutrient supply in addition to existing root feeds.
Care problems
Yellow leaves, soft roots or weak growth have several possible causes. Check water level, roots, light and previous nutrition before adding more fertiliser. This product is not a treatment for plant disease.
Plant protection advice
The plant species, photographs and details of location, moisture and previous care help assess plant damage. Identify the cause and a suitable application before treatment.
More fertiliser is not a general solution to growing problems. A recommendation to buy products together does not confirm that they can be mixed.
Plant protection products and application
General manufacturer information: these products have not been selected here as suitable treatments for the plant shown here. Before use, check the plant species, pest, application site and current instructions.
Use plant protection products safely. Always read the label and product information before use.
Plant care
Understand the growing method
Hydroculture describes how a plant is grown. It does not replace the botanical species or its needs. Granules in a closed container and technically aerated or circulating systems are not the same application.
Choose light and position
Even without soil, the plant determines light and temperature needs. Position the container securely and avoid unnecessary heating of the roots. Extra fertiliser cannot compensate for insufficient light or an unsuitable position.
Check water level and roots
Observe the water-level indicator and actual demand. Do not refill solely by the calendar or keep the entire root system permanently submerged. Existing water and nutrients count towards every further application.
Distinguish repotting from conversion
A plant already grown in hydroculture needs gentle root handling and a suitable new container volume when moved. Converting a soil-grown plant is a separate intervention. Check species and root condition; then follow the leaflet’s minimum two-week feeding pause.
Care for leaves and shoots
Remove dead plant material and clean leaf surfaces gently when necessary. Pruning and pinching depend on species and growth habit; there is no single pruning rule for every hydroculture plant.
Account for growth and dormancy
A warm, lit crop may develop differently from a cool houseplant in winter. Actual growth and species-specific dormancy determine nutrition. The source does not establish one unambiguous refill schedule for every container.
Frequently asked questions
How do I prepare the basic mixture?
Use 5 ml per 1.5 litres of water, or 10 ml for 3 litres of water. This calculation applies only to the prepared mixture. Adding it to the hydro container then follows the product’s own hydroculture instructions and plant needs.
How is the refill diluted?
When water is needed again, the leaflet divides the refill volume as follows: light feeders, ⅔ water + ⅓ prepared fertiliser mixture; moderate feeders, ½ of each; heavy feeders, ⅓ water + ⅔ prepared fertiliser mixture. Select the category for the particular plant. These fractions refer to the mixture already prepared with 5 ml per 1.5 litres of water, never to the concentrate.
Is this a universal solution for all hydro systems?
The instructions here cover the described hydroculture with granules and a water-level indicator. They do not establish a complete recipe for every NFT, DWC or aeroponic system. Water quality, species, nutrient requirements and technical operation need to be matched separately.
Is there a matching one-litre bottle?
Yes. The 1 litre bottle carries the same nutrient declaration and prepared-mixture rate as the 250 ml size. The twin pack contains two individually closed 250 ml bottles. Choose the size for your actual needs.
Can I feed immediately after conversion?
Do not feed during dormancy. After repotting or conversion to hydroculture, the product’s own leaflet specifies at least two weeks without fertiliser. Adjust subsequent care to growth, root condition and nutrients already available.
Is the product pH the same as the water pH?
No. The declared pH of 6.9 describes the concentrate. It guarantees neither the pH in the hydro container nor one shared EC target. Leaf and root care still depend on species and conditions.
Safety and storage
Safety instructions
SDS – Safety data sheet available on request.
Do not feed during dormancy. After repotting or conversion to hydroculture, the product’s own leaflet specifies at least two weeks without fertiliser. Adjust subsequent care to growth, root condition and nutrients already available.
- Shake before use. Never apply undiluted.
- Prefer low-lime water or rainwater at 15–25 °C; check water quality for the crop.
- Do not apply in sun, below 5 °C or above 30 °C.
- Feed only pre-moistened roots; avoid open flowers when spraying.
- Keep away from children and animals. Official advisory recommendations take precedence.
Storage
Dry and dark, above 8 °C to no more than 38 °C
Store in a dry, dark place above 8 °C and no higher than 38 °C. Keep out of reach of children and animals.
Manufacturer / company placing the product on the market
GREEN24 GmbH
Am Neggenborn 125
44892 Bochum, Germany
info@green24.de
www.green24.de
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