---
title: Tufa moss rock in a terrarium | Glass Jar Garden
description: Tufa moss rock: Tufa is a soft, pitted limestone that soaks up water, and moss grows on it well. In the jar it has holds water 22.5 % by volume, pore space...
url: https://glassjar.garden/guide/hardscape/moss-rock/
---

Stones and wood

# Tufa moss rock

Tufa is a soft, pitted limestone that soaks up water, and moss grows on it well.

## What the simulation uses

- Holds water: 22.5 % by volume (Water it keeps after draining; the rest runs down to the drainage.)

- Pore space: 40 % by volume (Room for air and water between grains; low means roots suffocate when wet.)

- Weight: 1400 g/L (How heavy a litre is.)

- pH: 7.5 to 8.2 pH (How acid it keeps the soil.)

## Description
Tufa is a soft, pitted limestone that soaks up water, and moss grows on it well. Being limestone, it nudges pH up toward alkaline.

Also called tufa.

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

[Grow it in a jar](https://glassjar.garden/?guide=hardscape/moss-rock)

[Spider wood](https://glassjar.garden/guide/hardscape/spider-wood/) · [White river stones](https://glassjar.garden/guide/hardscape/white-river-stone/) · [All stones and wood](https://glassjar.garden/guide/hardscape/)