Yes, you can grow a small hazelnut bush in an outdoor plant box! Hazelnuts (Corylus spp.) are adaptable plants that thrive in containers if given proper care. Choose a compact variety like 'Contorta' or 'Red Dragon' for smaller spaces. Ensure your plant box is at least 18-24 inches deep and wide, with excellent drainage. Use well-draining, nutrient-rich soil and place the box in a sunny spot (6+ hours of sunlight daily).

Water regularly to keep soil moist but not soggy, and fertilize in early spring with a balanced organic fertilizer. Prune annually to maintain shape and encourage nut production. While container-grown hazelnuts may produce fewer nuts than in-ground plants, you'll still enjoy their attractive foliage and the satisfaction of homegrown nuts. In colder climates, protect roots in winter by insulating the box or moving it to a sheltered location.

With proper care, your outdoor plant box can support a healthy hazelnut bush for years, providing both ornamental value and delicious nuts!