Keeping your urban planter boxes thriving requires proper nutrition, but figuring out how often to fertilize can be confusing. Unlike plants in the ground, container plants have limited soil and nutrients that get depleted quickly. The frequency depends on several key factors.
For most flowering annuals and vegetable plants in containers, a good rule of thumb is to fertilize every 2 to 4 weeks during the active growing season (spring and summer). You can use a balanced, water-soluble fertilizer or a slow-release granular product mixed into the potting soil at planting time. Slow-release fertilizers can feed your plants for several months, reducing the need for frequent applications.
Always observe your plants for signs they need food. Yellowing leaves, stunted growth, or lack of flowers are common indicators. Remember to water your planters thoroughly before applying any liquid fertilizer to prevent root burn. With consistent feeding tailored to your plants' needs, your urban garden will be lush and productive all season long.