Growing stem vegetables in outdoor plant boxes is a fantastic way to maximize space and enjoy fresh produce. Some of the best plants for this purpose include celery, Swiss chard, bok choy, and asparagus. These vegetables thrive in containers with proper drainage and nutrient-rich soil.

Celery is a popular choice for its crisp stalks and versatility in cooking. Swiss chard offers colorful stems and is highly resilient, making it ideal for beginners. Bok choy, a fast-growing Asian green, provides tender stems and leaves. Asparagus, though requiring patience, rewards with perennial harvests.

To ensure success, use deep plant boxes (at least 12 inches) and maintain consistent moisture. Fertilize regularly with organic compost and place the boxes in a sunny spot. Rotate crops yearly to prevent soil depletion. With these tips, your outdoor plant boxes will yield abundant, delicious stem vegetables.