Creating a planetary orbit-themed outdoor plant box is a unique way to blend gardening with celestial inspiration. Here are the best plants to evoke the beauty of the cosmos:

1. Silver Dust (Jacobaea maritima) – Its silvery foliage mimics the moon’s glow, perfect for a lunar touch.

2. Black Mondo Grass (Ophiopogon planiscapus 'Nigrescens') – Dark, almost black leaves resemble the void of space.

3. Blue Star Creeper (Isotoma fluviatilis) – Tiny blue flowers mimic distant stars in a galaxy.

4. Moonflower (Ipomoea alba) – Blooms at night, echoing the mystery of orbiting planets.

5. Sedum 'Aurora' – Rosy-hued succulents add a Martian vibe.

These low-maintenance plants thrive in outdoor plant boxes, creating a stunning, space-inspired garden. Pair them with decorative rocks or mini planet figurines for an extra cosmic effect. Happy gardening among the stars!