RETENTIS® for soils and substrates

With RETENTIS®, any soil and substrate becomes a highly efficient water and nutrient reservoir. Even small additions improve the structure, increase moisture retention capacity, and ensure a consistent water and nutrient supply. Whether it's potting soil, container substrates, or raised bed substrates, RETENTIS® buffers dry periods, promotes healthy root growth, and reduces watering by up to 40%. At the same time, the wood-based granules act as a humus precursor, decomposing into nutrient-rich humus and permanently increasing soil fertility.

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Typical applications & dosages

Soil/substrate mixtures:
 10 – 20 g / liter of soil or substrate; Mix evenly with soil or substrate.

Root Protection Gel: Mix 0,5 - 0,7 kg with 10 liters of water. Wait 10-15 minutes until the granules have absorbed the liquid, stirring several times. Then immerse the roots for a few seconds.

Tip: Do not add RETENTIS® pure to the planting hole, but mix it with soil/substrate and mix well - this way the granules/gel are optimally distributed around the roots.

Pro tip: Cover the treated substrate or area with about 2-3 cm of untreated soil or substrate - this way RETENTIS® remains under the surface and well protected.

Extra tip: Incorporate fertilizer at the same time! Mix your tried and tested fertilizer directly into the soil together with RETENTIS®. It binds the nutrients and releases them continuously over weeks to the plant roots - no washing out, no nutrient shock.

🧮 Calculate the exact requirement for your project right below with the RETENTIS®Calc Tools.

Hand hält eine Portion RETENTIS®-Wasserspeichergel von Agrobiogel vor frisch gepflanzten Setzlingen im Boden, mit einem Fragezeichen als Hinweis auf die Berechnung der benötigten Menge (RETENTIS® Calc).

RETENTIS®-Calc

The RETENTIS®Calc tools provide you with the perfect dosage, water-saving effect and the right packaging size in seconds – simply enter the area or number of plants for the application area in RETENTIS®Calc or select a round or square container for the plant container in RETENTIS®Calc and get started.

To the calculation tools →
Illustration showing how to use RETENTIS® water storage gel: 1. Mix gel with soil or substrate, 2. Plant, 3. Water.

Easy to use

Work RETENTIS® evenly into the dry soil. As a rule of thumb, use 20 g of granules per 1 liter of potting soil.

Three steps:
1 Mix · 2 Plant · 3 Water

Extra tip:
Work in fertilizer at the same time:
 Mix your proven fertilizer directly into the soil with RETENTIS®. It binds the nutrients and releases them continuously to the plant roots over weeks – no leaching, no nutrient shock.

Before After

Why RETENTIS®

💧 Stores up to 10 liters of water per kilogram of granules and releases it back to the plants in dry conditions.
💦 Saves up to 40% irrigation water
⏳ Works in the soil for 3 – 5 years , completely without microplastics.
🍂 Promotes humus formation and soil structure.
⚖️ pH-neutral - RETENTIS® does not change the pH of the soil and can be mixed with other additives.
✅ is approved for organic farming .

Image: Basil after 3 weeks without watering, left with 2% RETENTIS®, right just soil. Move the slider and see the difference!

More about the RETENTIS® effect →

Further areas of application

Discover further applications of RETENTIS® and find the perfect solution for your project.

Find more application areas →