Galvanotropism, the growth or movement of plants in response to electrical stimulation, is a fascinating phenomenon that can be observed in outdoor plant boxes. Certain plants are more responsive to electrical currents, making them ideal for demonstrating this effect. Here are some of the best plants to use:

1. Sunflowers (Helianthus annuus) – Known for their rapid growth and sensitivity to environmental stimuli, sunflowers often exhibit noticeable galvanotropic responses.

2. Pea Plants (Pisum sativum) – These plants are commonly used in experiments due to their predictable growth patterns and responsiveness to electrical fields.

3. Bean Sprouts (Phaseolus vulgaris) – Their fast germination and growth make them excellent for observing galvanotropism in controlled settings.

4. Wheatgrass (Triticum aestivum) – This hardy plant shows clear directional growth when exposed to electrical currents.

5. Morning Glories (Ipomoea purpurea) – Their climbing nature and sensitivity to stimuli make them a great choice for galvanotropism experiments.

To conduct your own experiment, set up an outdoor plant box with a mild electrical current (ensure safety precautions). Observe how the plants grow toward or away from the current, depending on the species. This not only showcases galvanotropism but also adds an educational element to your gardening projects.

By selecting the right plants and carefully monitoring their growth, you can effectively demonstrate galvanotropism in your outdoor plant boxes. Happy experimenting!