Nutational sonotropism, the rhythmic, spiraling growth movement of plants in response to environmental stimuli, is a fascinating phenomenon to observe in outdoor plant boxes. Certain plants excel at showcasing this behavior due to their climbing or vining nature. Here are the best plants to demonstrate nutational sonotropism in your garden:

1. Morning Glory (Ipomoea purpurea) – Known for its rapid twining stems, morning glory exhibits pronounced nutational movements as it seeks support.

2. Sweet Pea (Lathyrus odoratus) – This fragrant climber displays elegant spiraling tendrils, perfect for observing sonotropism.

3. Hops (Humulus lupulus) – A vigorous grower, hops vines twist and turn dramatically, making them ideal for study.

4. Passionflower (Passiflora spp.) – With its intricate tendrils and rapid growth, passionflower vividly demonstrates nutational patterns.

5. Runner Beans (Phaseolus coccineus) – These fast-growing climbers showcase clear helical movements as they ascend supports.

For optimal results, provide sturdy trellises or supports in your outdoor plant boxes. Regular watering and sunlight will enhance growth and movement. Observing these plants can offer insights into plant behavior and add dynamic beauty to your garden.

By selecting these species, you can create a living display of nutational sonotropism, blending science and horticulture in your outdoor space.