Radiotropism, the growth response of plants to radiation, is a fascinating phenomenon that can be observed in outdoor plant boxes. Certain plants exhibit pronounced reactions to environmental radiation, making them ideal for experiments or educational purposes. Here are some of the best plants to demonstrate radiotropism:

1. Sunflowers (Helianthus annuus) – Known for their heliotropic behavior, sunflowers also respond to radiation, making them a classic choice.

2. Peas (Pisum sativum) – Fast-growing and sensitive to environmental changes, peas show clear radiotropic tendencies.

3. Beans (Phaseolus vulgaris) – Their vigorous growth and responsiveness to stimuli make beans excellent for radiotropism studies.

4. Marigolds (Tagetes spp.) – These hardy flowers react visibly to radiation, offering vibrant visual cues.

5. Radishes (Raphanus sativus) – Quick germination and root development allow for easy observation of radiotropic effects.

For optimal results, place outdoor plant boxes in areas with varying radiation exposure and monitor growth patterns over time. This setup not only highlights radiotropism but also enriches gardening experiments with real-world scientific insights.