Some plants that are suitable for terrariums include:

Mosses (such as sphagnum moss or fern moss)
Ferns (such as Boston fern or bird’s nest fern)
Ivy (such as English ivy or dwarf ivy)
Spider plants
Succulents (such as hens-and-chicks or burro’s tail)
Air plants (such as tillandsia or xerographica)
African violets
Peperomia
Creeping fig
It’s important to keep in mind that terrariums are closed and have a different environment than open ones, so you should choose plants that like a humid and moist environment.

The soil composition for a terrarium should be well-draining and able to hold moisture. You can create your own mix by combining the following materials:

• Sphagnum moss or peat moss: These materials help to retain moisture and improve drainage.
• Sand, perlite, or vermiculite: These materials improve drainage and aeration, preventing water from pooling in the soil.
• Charcoal: This is optional, but it can help to keep the soil clean and free of odors.
• A small amount of fertilizer: A slow-release fertilizer may be added to the soil to provide essential nutrients to the plants.

A suggested proportion would be 2 parts peat moss, 1 part perlite and 1 part sand, but you can adjust the proportion based on the plants you are growing.

It’s also important to note that you should not use regular potting soil as it may not drain well and could lead to mold or fungal growth in the terrarium.