Creating a white hole-themed outdoor plant box is a unique way to bring celestial inspiration to your garden. This theme calls for plants that evoke mystery, contrast, and a sense of the cosmic. Here are the best plants to achieve this ethereal look:

1. Silver Dust (Jacobaea maritima) – With its silvery-white foliage, this plant mimics the shimmering glow of a white hole. It’s drought-tolerant and adds a striking contrast.

2. White Hydrangeas – These lush blooms create a soft, cloud-like effect, perfect for a dreamy white hole aesthetic.

3. Dusty Miller (Senecio cineraria) – Its velvery silver leaves add texture and a futuristic vibe to your plant box.

4. White Alyssum – Delicate and fragrant, this ground cover plant resembles tiny stars scattered across the soil.

5. Ghost Fern (Athyrium niponicum 'Ghost') – With its pale fronds, this fern adds an otherworldly touch to your arrangement.

For a low-maintenance option, consider succulents like Echeveria 'Lola' or Graptopetalum paraguayense, which offer a pearlescent glow. Pair these with dark mulch or black stones to enhance the white hole illusion.

This theme thrives on contrast, so mix in deep green or black foliage plants like Black Mondo Grass for a dramatic effect. Water moderately and ensure good drainage to keep your celestial garden thriving.

Whether you’re a sci-fi enthusiast or simply love unique garden designs, a white hole-themed plant box is a conversation starter. Embrace the cosmic vibe and let your garden transport you to another dimension!