Yes, you can successfully grow dwarf saffron plants in an outdoor plant box with the right conditions. Saffron, derived from the Crocus sativus flower, thrives in well-draining soil and full sunlight. Here’s how to do it:

1. Choose the Right Container: Opt for a deep plant box (at least 12 inches) to accommodate the bulbs’ growth. Ensure it has drainage holes to prevent waterlogging.

2. Soil Preparation: Use a sandy or loamy soil mix enriched with organic compost. Saffron prefers slightly alkaline soil (pH 6.0–8.0).

3. Planting: Place the bulbs 3–4 inches apart and 3 inches deep. Plant them in late summer for autumn blooms.

4. Sunlight: Position the box in a spot with 6–8 hours of direct sunlight daily.

5. Watering: Water sparingly—saffron dislikes soggy soil. Let the topsoil dry between waterings.

6. Winter Care: In colder climates, mulch the box or move it indoors to protect the bulbs from frost.

With patience and care, your outdoor plant box can yield vibrant saffron flowers, providing prized threads for culinary or medicinal use. Happy gardening!