Planting tracks with sedum-based vegetation reduces the noise on sound-reflecting surfaces, such as paving or asphalt, by 6 - 8 dB, and another advantage is that it is green all year round.
Sedum is slow-growing and grows to a height of 30 - 40 mm which is why it does not need mowing, even after years. This also saves considerable maintenance costs (up to eight mowing sessions a year).
It is possible to arrange the special sedum plants in layers so as to smother out weeds and unwanted growth. The plants do not require fertiliser as they draw their nutrients from the minerals in the lava substrate.
They require little water therefore the dew is sufficient to keep them alive. On account of its grit size, the lava substrate does not solidify like soil, thereby permanently maintaining the evaporation and irrigation surfaces and helping to improve the urban climate.
The advantages of track planting are as follows:
- The noise of trams is minimised.
- The surface is green all year round.
- No mowing is required.
- There is no need for watering or fertiliser.
- Urban evaporation and irrigation surfaces are maintained.
- The urban microclimate is improved.