What Causes Mould in Terrariums?

Mould is common in closed terrariums, especially in the first few weeks. It thrives in warm, moist environments — exactly what your terrarium offers. Mould often appears on decaying leaves, wood, or soil surfaces.

Is Mould a Problem?

• In small amounts, mould is normal and part of a natural ecosystem.
• Excess mould can look unsightly or overwhelm delicate plants.
• Fuzzy white or grey patches on wood or soil are typical.

How to Manage Mould

• Remove any dead or decaying material using tweezers.
• Improve airflow by briefly opening the lid if condensation is excessive.
• Avoid overwatering — damp conditions fuel mould.

Springtails to the Rescue

Springtails are your best defence. These tiny insects eat mould and organic waste, helping to prevent mould outbreaks naturally. In a closed terrarium, they will self-regulate and keep the ecosystem balanced.

You can add springtails by pouring them in directly from their charcoal culture. They’ll get to work consuming mould straight away, and they’ll soon take care of your mould outbreak. Shop springtail cultures.

🔗 Related: Springtail Care Guide

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