Creating a black hole information paradox-themed outdoor plant box is a fascinating way to merge cosmic mystery with earthly greenery. Here are the best plants to evoke the enigmatic allure of black holes and the paradox they represent:

1. Black Mondo Grass (Ophiopogon planiscapus 'Nigrescens') – Its dark, almost black foliage mimics the inescapable pull of a black hole, symbolizing the event horizon.

2. Silver Dust (Jacobaea maritima) – The shimmering silver leaves represent the Hawking radiation, a theoretical escape of energy from black holes.

3. Ornamental Kale (Brassica oleracea) – Its swirling, fractal-like patterns echo the chaotic nature of information paradoxes.

4. Moonflower (Ipomoea alba) – Blooming at night, its white flowers contrast the darkness, symbolizing the duality of light and void.

5. String of Pearls (Senecio rowleyanus) – Its trailing vines resemble the accretion disk around a black hole, adding a dynamic touch.

Pair these with a minimalist, dark-colored plant box to enhance the cosmic theme. This setup not only sparks curiosity but also creates a visually striking garden feature. Happy planting!