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For a sealed environment, select small, slow-growing plants that thrive in high humidity and indirect light. Making a Bottle Terrarium + Closed Terrarium Basics
: Use a funnel to add your potting mix. Ensure the soil is deep enough (usually 5–8 cm) to anchor your chosen plants. Insert the Plants : Poke a hole in the soil using a stick or dowel.
: A thin coating of activated charcoal over the pebbles. This acts as a filter to keep the water "sweet" and prevent the growth of odors or harmful bacteria. bottle biosphere guide full
Lower them into the bottle and use tools to press the soil firmly around the roots.
: A 3–5 cm base of small rocks, pebbles, or horticultural grit. This prevents water from pooling at the bottom and rotting the plant roots. For a sealed environment, select small, slow-growing plants
Gently remove your plants from their original pots and shake off excess soil.
: A piece of mesh or weed suppressant fabric can be placed above the charcoal to keep the soil from sinking into the drainage layer. Insert the Plants : Poke a hole in
: About 8 cm of high-quality potting soil or peat-free coir compost. For tropical plants, a mix containing sphagnum peat moss or coco coir is ideal. Step-by-Step Construction Guide