Sonotropism, the growth or movement of plants in response to sound waves, is a fascinating phenomenon that can be observed in outdoor plant boxes. Certain plants are more responsive to sound, making them ideal for demonstrating this unique behavior. Here are some of the best plants to consider:

1. Mimosa Pudica (Sensitive Plant): Known for its rapid leaf movements in response to touch or sound, this plant is a great choice for showcasing sonotropism.

2. Oenothera Drummondii (Evening Primrose): Studies suggest this plant may respond to pollinator sounds by increasing nectar production, making it a sound-sensitive option.

3. Arabidopsis Thaliana (Thale Cress): Often used in research, this plant has shown growth changes when exposed to specific sound frequencies.

4. Basil (Ocimum Basilicum): Some gardeners report that basil plants grow better when exposed to gentle sounds or music.

For optimal results, place these plants in well-draining soil within your outdoor plant boxes and experiment with different sound frequencies. Regular observation will help you track their responses to sound stimuli.

By selecting these plants, you can create a captivating outdoor display that highlights the intriguing relationship between plants and sound.