Creating a firework-theory-themed outdoor plant box is a fantastic way to bring the explosive beauty of fireworks into your garden. To achieve this effect, focus on plants with vibrant colors, dynamic growth patterns, and striking textures. Here are the best plants to include:

1. Celosia (Cockscomb) – With its flame-like blooms in red, orange, and yellow, celosia mimics the fiery bursts of fireworks.

2. Gomphrena (Globe Amaranth) – These round, bright purple or pink flowers add a pop of color, resembling sparkling sparks.

3. Bidens (Golden Empire) – The cascading yellow flowers create a waterfall effect, perfect for a firework’s trailing sparks.

4. Echinacea (Coneflower) – Their bold, daisy-like blooms in hot hues like magenta and orange evoke firework explosions.

5. Ornamental Grasses (e.g., Pennisetum) – The wispy, flowing blades add movement, simulating the lingering trails of fireworks.

Pair these plants with dark mulch or a neutral backdrop to make their colors "pop" like a night sky. Water and sunlight are key to maintaining their vibrancy. With this selection, your outdoor plant box will be a dazzling, firework-inspired display all season long!