Creating a mini flower garden in an outdoor plant box is a delightful way to add color and life to small spaces. Start by selecting a sturdy plant box with proper drainage holes to prevent waterlogging. Choose a variety of flowers that thrive in your climate, considering factors like sunlight and soil type. Arrange the plants by height, placing taller varieties at the back and shorter ones in front for a layered look. Water regularly and add mulch to retain moisture. With minimal effort, your mini garden will bloom beautifully, transforming any outdoor area into a vibrant oasis.