Creating a nocino garden in outdoor plant boxes is a delightful way to cultivate the ingredients for traditional walnut liqueur. The star of this garden is the walnut tree (Juglans regia), whose green walnuts are essential for nocino. However, other complementary plants can enhance your garden's functionality and aesthetic.

1. Walnut Tree (Juglans regia): The foundation of any nocino garden, young walnut trees can thrive in large outdoor plant boxes. Harvest the green walnuts in early summer for the liqueur.

2. Herbs for Flavor:

- Lemon Balm (Melissa officinalis): Adds a citrusy note to nocino.

- Cinnamon Basil (Ocimum basilicum): Infuses a warm, spicy flavor.

- Vanilla Grass (Anthoxanthum odoratum): Provides a sweet, vanilla-like aroma.

3. Edible Flowers:

- Lavender (Lavandula): Adds floral depth to the liqueur.

- Rose Petals (Rosa): Introduce a delicate, romantic touch.

4. Supporting Plants:

- Mint (Mentha): Refreshes the palate and pairs well with walnuts.

- Thyme (Thymus vulgaris): Offers earthy undertones.

Tips for Success:

- Ensure your plant boxes have good drainage and are placed in full sun.

- Prune walnut trees regularly to manage growth in confined spaces.

- Harvest herbs and flowers at peak freshness for the best flavor.

With these plants, your outdoor nocino garden will be both productive and picturesque, perfect for crafting homemade walnut liqueur.