The Magic of Sealed Terrariums: A Self-Sustaining Ecosystem

How does a sealed glass container keep plants alive for years without watering? The beautiful science behind our living terrariums.

A sealed terrarium is one of the most elegant demonstrations of natural cycles in existence. Inside a sealed glass vessel, water evaporates from the soil and plant leaves, condenses on the glass walls, and drips back down to the roots — a perfect miniature water cycle that can sustain plant life for years, even decades, without any intervention.

The oldest known sealed terrarium was planted in 1960 by David Latimer in England. He last watered it in 1972. It's still alive today.

The key to a successful sealed terrarium is balance: the right ratio of plants to soil volume, the right amount of initial moisture, and plants that thrive in high humidity. We use a base layer of activated charcoal (to prevent bacterial growth), a drainage layer of pea gravel, and a rich organic potting mix. Our plant selections — various mosses, ferns, and miniature tropical plants — are chosen for their compatibility and growth rates.

Want to make your own? Join our Terrarium Building Workshop — we provide all materials and you leave with your own sealed living ecosystem.