Fertilizing plants in urban planter boxes is crucial for success, as container plants exhaust nutrients faster than in-ground gardens. Start the season by mixing a slow-release, balanced fertilizer into your potting mix at planting time. This provides a steady nutrient base. As plants enter active growth, supplement every 2-4 weeks with a water-soluble fertilizer, following label instructions to avoid over-fertilization, which can harm roots. For edible plants like herbs and vegetables, opt for organic options like fish emulsion or compost tea. Mid-season, monitor plants for signs of deficiency—yellowing leaves often indicate a need for nitrogen. Reduce feeding as the growing season winds down in late summer to allow plants to harden off. Always water thoroughly before and after applying fertilizer to prevent root burn. Remember, consistent, light feeding is far better than occasional heavy doses, leading to lush, productive plants on your balcony or patio all season long.
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