How to Plant a Terrarium in a Closed Garden Vase
By Handmade Glasses & Glassware | LSA International | Published: 2026-10-25
Category: How-to Guides
Learn how to plant a self-sustaining closed terrarium using a glass vase. Step-by-step guide with tips for succulents, moss, and cacti.
Quick answer
To plant a terrarium in a closed garden vase, layer drainage materials, add activated charcoal, soil, and slow-growing plants like succulents or moss, then seal with the cork lid to create a self-sustaining ecosystem.
Why a closed vase works for terrariums
A closed glass vase creates a humid microclimate that reduces watering needs. The cork lid traps moisture, making it ideal for plants that thrive in high humidity, such as moss and ferns. However, succulents and cacti prefer drier conditions, so they require careful watering and occasional venting to prevent rot.
The dome shape of the Closed Garden vase mimics a biosphere, allowing you to see condensation cycles and adjust care accordingly. This design also makes it easy to observe root growth and soil moisture without disturbing the plants.
Step-by-step planting guide
- Prepare the drainage layer: Add a 1-inch layer of small pebbles or gravel at the bottom of the vase. This prevents water from pooling around the roots and causing rot. Use pebbles that are too large can leave gaps; fine gravel works better for even drainage.
- Add activated charcoal: Sprinkle a thin layer of activated charcoal over the pebbles. Charcoal absorbs impurities and prevents mold and odors in the closed environment. Skip this step if you skip charcoal; the terrarium may develop musty smells over time.
- Layer the soil: Add a 2-3 inch layer of well-draining potting mix suitable for your plants. For succulents and cacti, use a sandy soil mix; for moss and ferns, use a peat-based mix. Using regular garden soil can compact and suffocate roots; always choose a mix designed for terrariums.
- Plant your chosen greenery: Gently place small plants like succulents, moss, or cacti into the soil. Use tweezers or a stick to position them without damaging roots. Space them to allow growth. Overcrowding leads to competition for moisture and light; leave at least an inch between plants.
- Mist and seal the terrarium: Lightly mist the inside of the vase with water until the soil is damp but not soggy. Place the cork lid on top to seal. Condensation should appear within a day. Too much water at this stage causes mold; if condensation is heavy, remove the lid for a few hours to dry out.
- Position and maintain: Place the terrarium in bright, indirect light. Avoid direct sunlight, which can overheat the glass. Check weekly: if the glass looks dry, mist lightly; if foggy, leave the lid off for a day. A closed terrarium can go weeks without water if the cycle is balanced; overwatering is the most common mistake.
Product facts
- Closed Garden: Each dome is mouthblown from recycled glass and finished with a sustainably-sourced removable cork lid. The recycled glass reduces environmental impact, and the cork lid allows you to control humidity and access the plants for maintenance.
Closed Garden
