Nutational electrotropism, a fascinating phenomenon where plants exhibit growth movements in response to electrical stimuli, can be vividly observed in outdoor plant boxes. Certain plants are particularly adept at showcasing this behavior, making them ideal for educational or experimental gardening.

1. Sunflowers (Helianthus annuus)

Sunflowers are renowned for their heliotropic movements, but they also display subtle nutational electrotropism. Their robust stems and large leaves respond to weak electrical fields, making them a great choice for outdoor plant boxes.

2. Mimosa Pudica (Sensitive Plant)

While famous for its thigmotropic responses, *Mimosa pudica* also exhibits electrotropic tendencies. Its rapid leaf movements can be influenced by electrical stimuli, offering a dynamic display.

3. Bean Plants (Phaseolus vulgaris)

Bean plants show clear nutational movements during growth, and their tendrils respond to electrical gradients. They thrive in outdoor settings, making them practical for plant box experiments.

4. Pea Plants (Pisum sativum)

Pea plants exhibit circumnutation, a spiral growth pattern that can be enhanced or altered by electrical fields. Their climbing habit adds visual interest to plant boxes.

5. Morning Glories (Ipomoea purpurea)

These fast-growing vines display pronounced nutational movements, and their responsiveness to environmental cues, including electrical stimuli, makes them excellent for demonstrations.

For optimal results, ensure your outdoor plant boxes receive adequate sunlight and moisture. Introduce mild electrical stimuli (e.g., low-voltage currents) to observe these plants' electrotropic responses. This setup not only highlights nature's adaptability but also serves as a captivating educational tool.

By selecting these plants, gardeners and educators can effectively demonstrate nutational electrotropism, blending science and horticulture in an engaging outdoor experiment.