Creating a beautiful and thriving mixed planting in a large urban planter box is an art form that combines horticultural knowledge with creative design. The key to success lies in understanding how different plants interact and complement each other. Start by considering the basic principle of "thriller, filler, and spiller" – include tall focal point plants, medium-sized plants to fill space, and trailing plants to spill over the edges. This creates visual interest and a balanced composition.
When selecting plants, pay close attention to their sunlight requirements, water needs, and growth habits. Group plants with similar environmental needs together to ensure they all thrive. Consider companion planting by combining plants that benefit each other, such as marigolds to deter pests from vegetables or herbs that improve the flavor of neighboring plants. Always research plant compatibility before making your final selections.
For larger containers, you have the space to create miniature ecosystems. You might combine a small dwarf fruit tree with shade-tolerant ground cover plants and seasonal flowers around the base. Or create a culinary corner with rosemary, thyme, oregano, and sage that all enjoy similar well-drained soil conditions. The depth of large planters allows for deeper root systems, giving you more options for plant combinations.
Remember to consider the vertical space as well. Use trellises or small obelisks in your planter to support climbing plants like beans, peas, or clematis. This adds another dimension to your container garden and maximizes your growing area. Regular maintenance including proper watering, fertilizing, and pruning will keep your mixed planting looking its best throughout the growing season.