Soils and layers
Decomposed granite
Gritty crushed granite that drains fast, made for arid builds.
What the simulation uses
- Holds water
- 11.5 % by volume
- Water it keeps after draining; the rest runs down to the drainage.
- Pore space
- 35 % by volume
- Room for air and water between grains; low means roots suffocate when wet.
- Weight
- 1650 g/L
- How heavy a litre is.
- pH
- 6.5 to 7.5 pH
- How acid it keeps the soil.
- Mould risk
- none
- How much fresh food it gives white mould; high-risk soils fuzz over in the first weeks.
- Nutrients
- low
- Plant food it brings.
- Presses down to
- 97 % of its loose depth
- How far pressing can pack it, keeping its weight.
Description
Gritty crushed granite that drains fast, made for arid builds. It is heavy and holds little water. Use it under the soil or as a dry top layer.
Also called DG, granite grit.
Estimated, where sources were thin: values estimated from hobby and horticultural references; not measured.