Yes, you can grow saffron crocus (Crocus sativus) in an outdoor plant box, provided you meet its specific growing conditions. Saffron crocus thrives in well-draining soil, ample sunlight, and a temperate climate. Here’s how to do it successfully:

1. Choose the Right Plant Box: Opt for a deep container (at least 6-8 inches) with drainage holes to prevent waterlogging.

2. Soil Preparation: Use a sandy, loamy mix enriched with organic matter to ensure proper drainage and fertility.

3. Planting the Bulbs: Plant saffron corms 3-4 inches deep and 4-6 inches apart in late summer or early fall.

4. Sunlight and Watering: Place the box in full sun and water sparingly—overwatering can rot the bulbs.

5. Winter Care: In colder regions, mulch the box to protect the corms from freezing temperatures.

Harvest the vibrant purple flowers in autumn to collect the prized saffron threads. With proper care, your outdoor plant box can yield this luxurious spice!