Nutational aerotropism is a fascinating plant movement where stems or tendrils grow in a helical or spiral pattern, often in response to air currents or touch. Outdoor plant boxes provide an excellent environment to observe this phenomenon. Here are some of the best plants to showcase nutational aerotropism:

1. Sweet Pea (Lathyrus odoratus) – Known for its delicate tendrils, sweet pea exhibits pronounced nutational movements as it climbs supports.

2. Morning Glory (Ipomoea purpurea) – This vigorous climber twists its stems in response to air flow, making it ideal for demonstrations.

3. Passionflower (Passiflora spp.) – With its rapid growth and curling tendrils, passionflower vividly displays nutational aerotropism.

4. Cucumber (Cucumis sativus) – Cucumber vines exhibit helical growth, especially when trained on trellises in outdoor boxes.

5. Hop (Humulus lupulus) – A fast-growing climber, hop plants show clear nutational patterns as they spiral around supports.

To observe nutational aerotropism, ensure your outdoor plant boxes are placed in a breezy location and provide sturdy trellises or strings for climbing. Regular monitoring will reveal the plants' dynamic responses to their environment.