---
title: Mould: how the terrarium simulator works | Glass Jar Garden
description: White mould blooms on fresh organics and leaves; springtails eat it. New jars usually fuzz white in the first weeks. Fallen leaves and leafy or bark top...
url: https://glassjar.garden/guide/how-it-works/mould/
---

How it works

# Mould

White mould blooms on fresh organics and leaves; springtails eat it.

- New jars usually fuzz white in the first weeks.
- Fallen leaves and leafy or bark top dressings keep feeding it, and it creeps to the ground beside.
- White mould is harmless to plants.
- Springtails graze it down; without them it can cover a fifth of the floor.
- Grey mould is a disease of weak plants in still, damp, dim jars.

## Stats

- Growth: 45% a day at full food

- Grazed: 25% a day per 1,000 springtails

- Most cover: 60% of a spot

[See it in a jar](https://glassjar.garden/?guide=how-it-works/mould)

[← Critters](https://glassjar.garden/guide/how-it-works/critters/) · [Care →](https://glassjar.garden/guide/how-it-works/care/)