Aerotropism, the growth of plant roots toward oxygen-rich environments, is a fascinating phenomenon easily observed in outdoor plant boxes. Certain plants excel at showcasing this behavior due to their adaptive root systems. Here are the top choices for demonstrating aerotropism outdoors:

1. Tomatoes (Solanum lycopersicum) – Their vigorous root systems actively seek oxygen, making them ideal for aerotropism experiments.

2. Peas (Pisum sativum) – Fast-growing roots that visibly respond to oxygen gradients in well-aerated soil.

3. Radishes (Raphanus sativus) – Their rapid root development clearly shows directional growth toward oxygen sources.

4. Beans (Phaseolus vulgaris) – Strong root systems that thrive in oxygenated environments, perfect for observation.

5. Sunflowers (Helianthus annuus) – Deep roots that adapt quickly to soil aeration changes.

For best results, use loose, well-draining soil in your plant boxes and monitor root growth patterns. These plants not only highlight aerotropism but also thrive in outdoor settings, making them excellent for educational or gardening projects.