Bottle Biosphere Guide Full ((link)) May 2026

: 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 that thrive in high humidity and indirect light. Making a Bottle Terrarium + Closed Terrarium Basics bottle biosphere guide full

: 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 : A 3–5 cm base of small rocks,