Seismotropism, the fascinating phenomenon where plants exhibit movement in response to seismic activity, can be beautifully observed in outdoor plant boxes. Certain plants are particularly adept at showcasing this natural behavior, making them ideal for educational or decorative purposes. Here are some of the best plants to consider:

1. Mimosa pudica (Sensitive Plant): Known for its rapid leaf-folding response to touch or vibration, this plant vividly demonstrates seismotropism. Its delicate leaves react instantly, making it a top choice.

2. Oxalis spp. (Wood Sorrel): These plants fold their leaves in response to disturbances, including subtle tremors, offering a clear display of seismic sensitivity.

3. Codariocalyx motorius (Telegraph Plant): Its leaves move rhythmically even without external stimuli, but vibrations amplify the motion, creating a mesmerizing effect.

4. Desmodium gyrans (Dancing Plant): Famous for its spontaneous leaf movements, this plant responds dynamically to vibrations, making it a standout for seismotropism studies.

For optimal results, place these plants in well-draining soil and expose them to gentle vibrations or natural tremors. Observing their responses can provide both scientific insight and aesthetic pleasure in your outdoor space.