Creating a galaxy-themed outdoor plant box is a fantastic way to bring the wonders of the cosmos to your garden. To achieve this celestial look, focus on plants with unique colors, textures, and shapes that evoke the mystery and beauty of space.

1. Silver Dust (Senecio cineraria) – Its silvery, velvety leaves mimic the shimmer of distant stars, adding a cosmic glow to your plant box.

2. Black Mondo Grass (Ophiopogon planiscapus 'Nigrescens') – With its deep purple-black foliage, this grass resembles the dark expanse of the universe.

3. Blue Star Creeper (Isotoma fluviatilis) – Tiny blue flowers create a starry effect, perfect for a galaxy-inspired ground cover.

4. Echeveria 'Black Prince' – This dark succulent adds a dramatic, otherworldly touch with its rosette shape and deep hues.

5. Lavender (Lavandula) – Its purple blooms and silvery foliage evoke the colors of nebulae, blending beauty with fragrance.

For extra flair, incorporate glow-in-the-dark pebbles or LED fairy lights to mimic twinkling stars. Pair these plants with a dark mulch or black sand to enhance the cosmic vibe. Whether you’re a space enthusiast or a gardening lover, a galaxy-themed plant box will transform your outdoor space into a stellar oasis.