When building a terrarium, activated charcoal may look like a simple black layer, but it plays a crucial role in keeping the ecosystem healthy.

Activated charcoal is a highly porous material that helps filter water, absorb impurities, and reduce odors inside the terrarium. In closed ecosystems, where air circulation is limited, this extra layer helps create a cleaner environment for plants and beneficial microorganisms.

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What Does Activated Charcoal Do?

Filters Impurities
Activated charcoal helps trap unwanted compounds that can build up over time.

Supports Moisture Balance
It assists in managing excess moisture and helps prevent stagnant conditions.

Creates a Healthier Ecosystem
By improving environmental conditions, charcoal supports healthier roots, moss, and tropical plants.

Helps Reduce Mold and Odors
While not a complete solution, activated charcoal can help minimize mold-friendly conditions and unwanted smells.

Where Does Activated Charcoal Go?

In most terrariums, activated charcoal sits between the drainage layer and the soil.

Typical terrarium layers:

1. LECA (Drainage Layer)
2. Activated Charcoal
3. Soil Substrate
4. Plants & Moss
5. Decorative Materials

Is Activated Charcoal Necessary?

While some terrariums can survive without it, activated charcoal is highly recommended for closed ecosystems. It adds an extra layer of protection and helps maintain a cleaner, more balanced environment over time.

At Terrart NYC, activated charcoal is included in our workshops and DIY Terrarium Kits because it helps create healthier, longer-lasting ecosystems with minimal maintenance.

A strong terrarium starts with the right foundation, and activated charcoal is one of the key ingredients that helps keep everything in balance.