Creating an ER=EPR-themed outdoor plant box is a fascinating way to merge quantum physics with gardening. The ER=EPR conjecture, which suggests a deep connection between entangled particles and wormholes, inspires a garden that feels interconnected and mysterious. Here are the best plants to bring this theme to life:

1. Spider Plant (Chlorophytum comosum) – Symbolizing entanglement, its cascading leaves mimic the idea of quantum connections.

2. String of Pearls (Senecio rowleyanus) – Its trailing vines resemble wormholes, perfect for an ER=EPR aesthetic.

3. Ferns (Various species) – Their fractal patterns echo the complexity of quantum theory.

4. Lavender (Lavandula) – Adds a calming, almost "otherworldly" fragrance, enhancing the garden’s mystical vibe.

5. Moss (Bryophyta) – Represents the foundational "fabric" of space-time, grounding your theme.

Pair these plants with geometric planters or mirrored accents to emphasize the quantum theme. Water regularly and ensure partial shade for optimal growth. This unique garden will spark curiosity and deepen your connection to the cosmos!