Nutational phototropism is a fascinating plant behavior where stems or tendrils move in a spiral or oscillating pattern to seek sunlight. Outdoor plant boxes provide an ideal setting to observe this phenomenon. Here are the best plants to showcase nutational phototropism:

1. Morning Glory (Ipomoea purpurea) – These fast-growing climbers exhibit pronounced spiraling tendrils that actively seek support and sunlight.

2. Sweet Pea (Lathyrus odoratus) – Known for their delicate stems that perform elegant nutational movements as they climb trellises.

3. Hop Vine (Humulus lupulus) – A vigorous grower with twining stems that demonstrate clear phototropic responses.

4. Passionflower (Passiflora spp.) – Their tendrils perform slow but distinct nutational rotations to latch onto structures.

5. Runner Beans (Phaseolus coccineus) – Exhibits strong helical growth patterns when searching for light.

For optimal results, place plant boxes in sunny locations and provide vertical supports like trellises or stakes. Regular watering and balanced fertilization will enhance growth and phototropic responses. Observing these plants can be a rewarding way to study plant behavior in small outdoor spaces.