Succulent Terrarium Guide — How to Build and Maintain

Step-by-step guide to creating a succulent terrarium. Open vs closed containers, drainage layers, best species to use, and common terrarium mistakes. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: MUST use an open container — closed terrariums trap humidity and kill succulents. Drainage layer: 1 inch of pebbles or LECA at the bottom since there are no drainage holes. Charcoal layer: A thin layer of activated charcoal on top of pebbles prevents odor and bacteria. Soil: Fast-draining succulent mix on top — keep the layer shallow (2-3 inches max). Best species: Echeveria, Haworthia, small Sedum, Sempervivum, small Crassula. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Terrariums lack drainage holes — the pebble and charcoal layers help manage excess water. Open containers are essential: succulents need air circulation and low humidity. Small slow-growing species work best — fast growers will outgrow the container quickly. Terrariums are decorative but less ideal for succulent health than regular pots with drainage. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Choose an open glass container: bowl, cylinder, or wide-mouth jar — never a closed container. Add 1 inch of small pebbles or LECA as a drainage layer at the bottom. Add a thin layer (0.5 inch) of activated charcoal on top of the drainage layer. Add 2-3 inches of fast-draining succulent soil, then plant your chosen succulents. Water very sparingly: Use a squeeze bottle or pipette to deliver small amounts directly to roots. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Succulents & Cacti collection on Houseplants Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.