Self Sustaining Ecosystem in a Jar

A large glass jar with a sealable lid

Small pebbles for drainage

Activated charcoal (available at pet stores)

Potting soil

2-3 small plants: moss, ferns, or small tropical plants

A spray bottle with water

Layer pebbles (1 inch), charcoal (thin layer), and potting soil (2-3 inches) in the jar.

Plant 2-3 small humidity-loving plants. Press roots into soil.

Spray until moist but not soaked. Seal the jar.

Place in indirect sunlight.

Watch for condensation within days — the water cycle in miniature.

Observe weekly: "Are the plants growing? Where does the water collect? What changes?"

"This jar is a tiny Earth — sealed, self-sustaining, recycling everything."

Choose plants that love humidity and don't grow too fast. Moss is ideal.

Don't overwater. Too much water causes mold. The soil should be damp, not soggy.

Indirect sunlight is key. Direct sun creates a greenhouse effect that can cook the plants.

If condensation blocks your view, the jar is too wet. Open briefly to let some moisture escape.

Start a weekly observation log: draw the jar, note changes, measure plant growth. This is longitudinal scientific observation.

The terrarium can live for months or even years if balanced correctly.