Absolutely! Pairing plants successfully in urban planter boxes is an art that combines aesthetics with practicality. The key is to choose plants with similar needs for sunlight, water, and soil. A classic and foolproof strategy is the "Thriller, Filler, Spiller" formula. Start with a tall, dramatic "thriller" plant like ornamental grass or a small spike dracaena as your focal point. Surround it with bushy "filler" plants such as petunias, begonias, or coleus to add volume and color. Finally, include trailing "spiller" plants like ivy, sweet potato vine, or creeping thyme to cascade gracefully over the edges, softening the box's appearance.
For edible gardens, consider companion planting. Pair tall tomatoes with low-growing basil and marigolds; the basil may enhance flavor while marigolds deter pests. Lettuce and herbs like chives or parsley also grow well together. Always ensure your planter has adequate drainage holes and use a high-quality potting mix. With thoughtful pairings, your urban planter can become a lush, productive, and beautiful miniature ecosystem.