Creating a Halloween-themed outdoor plant box is a fantastic way to celebrate the spooky season with a touch of natural charm. Here are the best plants to include for a hauntingly beautiful display:

1. Black Mondo Grass (Ophiopogon planiscapus 'Nigrescens') – With its deep black foliage, this grass adds a dramatic, eerie vibe to your plant box.

2. Ornamental Peppers (Capsicum annuum) – Their bright red or orange fruits resemble tiny pumpkins or fiery embers, perfect for a Halloween aesthetic.

3. Dusty Miller (Senecio cineraria) – The silvery-gray leaves evoke a ghostly, moonlit atmosphere.

4. Purple Fountain Grass (Pennisetum setaceum 'Rubrum') – Its dark purple plumes sway in the wind, creating a mystical effect.

5. Witch Hazel (Hamamelis) – Known for its twisted branches and late fall blooms, it adds a witchy, mystical touch.

Pair these plants with miniature pumpkins, faux cobwebs, or LED candles for an extra spooky twist. Happy haunting!