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: 1–2 inches of small pebbles or gravel to prevent root rot. Filtration : A thin layer of activated charcoal to filter water and prevent odors/mold.

: Add the pebbles first, then the charcoal, followed by the potting soil.

Start with a clay substrate or drainage layer to prevent root rot. Substrate: Add volcanic soil or nutrient-rich dirt. Hardscape:

A bottle biosphere is a . While energy (light and heat) enters and leaves freely, matter remains trapped inside.

: 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