If you're considering growing a small ptelea (Ptlea trifoliata) in an outdoor plant box, the answer is yes—with the right conditions. Pteleas, also known as hop trees, are hardy and adaptable, making them suitable for container gardening.

Key Considerations:

1. Size: Choose a plant box at least 18-24 inches deep to accommodate the ptelea's root system.

2. Drainage: Ensure the box has proper drainage holes to prevent waterlogging.

3. Soil: Use well-draining soil mixed with compost for optimal growth.

4. Sunlight: Pteleas thrive in full sun to partial shade, so place the box accordingly.

5. Maintenance: Regular watering and occasional pruning will keep your ptelea healthy.

Outdoor plant boxes are ideal for urban gardeners or those with limited space. With proper care, your small ptelea can flourish in a container, adding greenery and charm to patios, balconies, or small yards.