Growing plants without substrate Sinterra Hydrostarter sustainability bare-root bareroot green circular economy hydroponics aquaponics hydroponic aquaponic cultivation food growing future alternative peat rock wool light water seedling agriculture farming
Hydroponic cultivation system Hydrostarter seedlings sustainable substrate-less "without substrate" no need for substrate only water only light resources efficiency circular economy from cradle to cradle innovation agriculture startup
Sinterra logo Icon plant icon sustainable Tilt Industries Lower Rhine Side Cleve Cologne Dusseldorf Startup green economy close the loop

Our Idea


Hydroponic systems technically make it possible to grow plants without the use of substrates. 

So why do we still use them?

With the Hydrostarter we have developed a cultivation system that enables you to produce bare-root seedlings without any substrate.



No soil, no substrate. To grow plants in the Hydrostarter, only water and light are needed.

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Bareroot seedling in hand sustainable agriculture cultivation salad basil food science medicinal use future diy do-it-yourself hydroponics hydroponic aquaponic water-based innovation substrate rock wool peat soil without soil


Without the need for artificial or natural substrates, the Hydrostarter grows bare-root seedlings which are perfectly suited for further hydroponic cultivation


Only the pure plant is harvested - without any rooted substrate. Hydrostarter and plant can be separated very easily and the device is reusable.

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Our Motivation 


Aquaponic and hydroponic cultivation are concepts for sustainable food production based on the idea of a circular economy. The resource savings are already impressive. However, substrates are still used to grow plants from seeds and in some cases this involves enormous environmental pollution (e.g. peat, rock wool). For this reason, we have developed the Hydrostarter, a hydroponic cultivation system that makes it possible to produce bare-root seedlings without any detours.


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Hydrostarter bare roots water light air growing seedlings plants cultivation agriculture on mars sustainable future which substrate no substrate no soil soilless urban gardening green city innovation plant life
hydroponic cultivation system planting device future of food basil agriculture

So simple

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So compatible


When the seedlings are large enough, they can be transplanted into another medium, or transferred into a hydroponic system together with the Hydrostarter.


different aquaponic systems substrates expended clay greenhouse farming cattle fodder feeding humans and animals vertical farming hydroponics aquaponics

circular economy sustainable sustainability



Unlike substrate, the Hydrostarter can be reused. 

Aquaponics and hydroponics become part of the circular economy.

comfort tea time break improvement ease of use so simple



The reservoir is large enough to provide the young plants with water for days and even weeks.

Handling substrate is completely eliminated.

flexibility hydroponic systems further use planting pictogram



The Hydrostarter can be used to grow various plants (e.g. lettuce, basil, pak choi).

The bare-root seedlings are suitable for any hydroponic system.

for private use

hydponics, aquaponics, germination, cultivation, substrate, zero waste, circular economy, sinterra, sustainability







for commercial use

hydponics, aquaponics, germination, cultivation, substrate, zero waste, circular economy, sinterra, sustainability

Hydrostarter Hydroponics Aquaponics Substrate mineral wool zero waste circular economy without substrate alternative

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17 global goals for sustainable development, sustainability, zero hunger, clean water, innovation, responsible consumption and production, climate action, life on land