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Layers consisting solely of grass clippings or leaves compact significantly within a short period of time. Oxygen levels within these layers drop rapidly, which disrupts or even completely halts the decomposition process.
In a traditional compost pile, this almost inevitably leads to rotting.
Traditional compost bins are basically nothing more than compost piles resting on the ground and covered with a liner. This design often allows even less air into the pile than an open compost pile.
Many guides recommend layering grass clippings with leaves or organic matter and turning the pile several times a year. In practice, however, this is rarely done. The result is compacted, poorly aerated areas—ideal conditions for odors.
For grass clippings to compost properly, one thing is essential: sufficient oxygen throughout the material.
Only when air reaches the center of the pile can microorganisms do their job effectively. This prevents rotting and instead promotes a stable decomposition process.
The SUPERCOMP designed specifically to address this problem. Its built-in support mechanism and vertical ventilation (chimney effect) prevent the material from becoming completely compacted.
Oxygen continuously flows from the bottom to the top through the entire compost pile—including the core. This keeps the material loose and well-aerated, even when dealing with difficult materials like grass clippings.
Tests have shown that SUPERCOMP particularly challenging materials can be composted in SUPERCOMP without mixing and without odor issues.
Yes. With the SUPERCOMP , you SUPERCOMP compost grass clippings alone—without any additional bulking agents.
We recommend using only a small amount of rock dust to help retain nutrients. No other additives or repotting are necessary.
During the initial active decomposition phase, temperatures in the compost can reach approximately 50 to 70 °C. Under particularly favorable conditions—especially when there is a large amount of fresh grass clippings—temperatures as high as 70–80 °C are even possible for short periods.
These high temperatures result from the intense activity of microorganisms and are a sign that the composting process is working well. At the same time, this process largely breaks down unwanted germs and seeds.
It is important to ensure an adequate supply of oxygen. Only when there is enough air can this hot decomposition phase develop optimally and remain stable.
Over a 12-week period, JOANNEUM RESEARCH SUPERCOMP extensive studies on the practicality and efficiency of SUPERCOMP .
The studies confirm that the special design, featuring sliding surfaces and vertical ventilation, results in a continuous and stable composting process.
In practice, it has also been observed that freshly spread grass clippings lose a significant amount of volume within the first week. In addition to biological decomposition, this is also due to the material settling under its own weight.
This is precisely where the design’s advantage becomes apparent: despite this compaction, air circulation is maintained. Learn more here.
Thinner layers compact less than very large amounts added all at once. If you add grass clippings gradually, the decomposition process will proceed more evenly. With very large amounts, it helps to spread the material loosely and not pack it down.
Grass clippings aren’t waste—they’re a valuable source of nutrients. When composted properly, they turn into humus that can be used back in the garden. This keeps nutrients in a closed loop, so they don’t have to be thrown away.
A small amount of rock dust can help retain nutrients and further reduce odors. However, it does not replace the most important requirement: sufficient oxygen in the compost.
When mowing the lawn, air supply determines whether the result is successful or smelly. Where there is a lack of oxygen, rot sets in. Where oxygen reaches the core, even difficult material can be broken down effectively.
Grass clippings are one of the most challenging materials to compost. Without adequate aeration, they almost always lead to rotting and odors.
With a system like the SUPERCOMP, which ensures a continuous supply of oxygen, composting becomes simple and reliable—even with just grass clippings.
The SUPERCOMP exactly that SUPERCOMP : a stable, odor-free composting process without turning or laborious mixing of materials.
Grass clippings are very fine and damp. They compact quickly, so that hardly any air can get in. This leads to a lack of oxygen—and consequently to rot and odor.
In small quantities, yes. Larger quantities should be mixed with dry material in conventional composters, as they will otherwise compact quickly and start to rot.
With SUPERCOMP , however, grass clippings SUPERCOMP be composted on their own without any major problems, as the vertical aeration ensures an adequate supply of oxygen.
It contains a lot of nitrogen and has a very fine structure. As a result, it quickly becomes dense and airtight.
More air. Either by mixing in textured material such as leaves, or by using a system like SUPERCOMP, which ensures good aeration.
Traditional composters usually come with their share of problems. With the SUPERCOMP , its vertical aeration system SUPERCOMP it possible to compost even pure grass clippings cleanly.
With traditional composters, yes, to let air in again. With SUPERCOMP , turning SUPERCOMP necessary because it's continuously aerated.
Very fast under good conditions. You can often see the first reduction in volume after just a few days.
Not necessarily. However, a small amount can help retain nutrients and improve the quality of the compost.
Grass clippings can be added regularly. It’s not just the quantity that matters, but above all the aeration. In conventional composters, larger quantities should be mixed with dry material whenever possible.
With SUPERCOMP also compost grass clippings alone, because air is circulated through the pile from the bottom up. This keeps oxygen in the material, even as the grass clippings settle.
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