Nutational thermonasty is a fascinating plant movement response to temperature changes, where plants exhibit rhythmic or directional growth. For outdoor plant boxes, selecting species that clearly display this phenomenon can enhance both scientific observation and aesthetic appeal. Here are the best plants to showcase nutational thermonasty:

1. Sunflower (Helianthus annuus) – Known for its heliotropic movement, sunflowers also exhibit subtle nutational thermonasty, especially in young stems.

2. Bean Plants (Phaseolus vulgaris) – Their twining tendrils and leaf movements respond dynamically to temperature fluctuations.

3. Mimosa Pudica (Sensitive Plant) – While famous for thigmonasty, its leaves also show thermonastic responses in cooler temperatures.

4. Tulips (Tulipa spp.) – Their petals open and close with temperature changes, making them ideal for visual demonstrations.

5. Oxalis (Oxalis triangularis) – Leaves fold and unfold in response to light and temperature, showcasing clear thermonastic behavior.

For optimal results, place these plants in outdoor boxes with varying microclimates to observe their movements. Regular monitoring and controlled temperature experiments can further highlight their thermonastic traits.

By choosing these species, gardeners and educators can create engaging displays of plant adaptability and natural rhythms.