Stones and wood

Grapevine wood

Twisting, fibrous vine stems with loose, peeling bark.

What the simulation uses

Holds water: 30 % by volume; Water it keeps after draining; the rest runs down to the drainage.
Pore space: 60 % by volume; Room for air and water between grains; low means roots suffocate when wet.
Weight: 400 g/L; How heavy a litre is.
pH: 5.5 to 7 pH; How acid it keeps the soil.

Twisting, fibrous vine stems with loose, peeling bark. They are light, hold a fair bit of water and offer plenty of perches for climbing critters.

Also called grape wood, grapevine branch.

Estimated, where sources were thin: look authored for the app; physical values estimated.