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After you’ve mixed your soil, it’s time to build the terrarium. Years of practice (and a few mistakes) taught me that simplicity and precision matter more than the height of each layer. Each layer has a job, and more is not necessarily better. Drainage Layer The drainage layer’s sole purpose is to create permanent air space so excess water has somewhere to go. It doesn’t “drain” water out; it keeps water away from plant roots. Use small lava stones, pea gravel, LECA, crushed

From years of experimenting and trial‑and‑error, I’ve learned that a balanced, thriving terrarium leans on two pillars: the soil mix and the tiny critters that keep it in check. This post focuses on the soil. A good terrarium mix should be well aerated, drain easily, and stay rich in nutrients for the long haul. I’ve been keeping terrariums since 2019, and these are the ingredients and proportions that work for me. Why I Mix Instead of Layer Terrarium soil mix is typically a

Not all movement in a terrarium is a problem. In fact, some of it is essential. The tiny white insects you may notice moving through the soil are called springtails . Springtails are a beneficial part of a healthy terrarium ecosystem . They feed on fungi, mold and decaying organic matter, helping maintain microbial balance and prevent outbreaks before they become visible. Most springtails are so small they’re barely noticeable, and that’s exactly how they should be. Their pre

Place your miniature garden in a well-lit location with no direct sunlight . Direct sun can create a greenhouse effect inside the glass and rapidly overheat a sealed terrarium, destabilizing the internal ecosystem. I design terrariums using low to medium light terrarium plants , but even shade-tolerant species require consistent, indirect light to remain in balance. For context, standard indoor LED or fluorescent lighting  provides only about ~1% of full sunlight intensity .

Water & irrigation in sealed terrariums A sealed glass garden is a closed, autonomous ecosystem, which means terrarium watering  should be minimal and intentional. In a properly balanced sealed terrarium , irrigation is typically needed only a few times per year , not weekly or monthly like traditional houseplants. Let the system guide you. Moss and soil are the most reliable indicators for terrarium water needs . When the moss appears dry, gently lift it and check the soil b

Growth management in a sealed terrarium Healthy growth is a sign that your terrarium is in balance, but growth still needs gentle management. As plants mature, it’s common for leaves to reach or touch the glass. This isn’t automatically a problem, but it’s something to observe. Some plants commonly used in sealed terrariums , such as Ficus  and Fittonia , are resilient and can tolerate contact with the glass without issue. Their leaves remain healthy even in consistently humi