Enjoy more beautiful foliage and blooms with our new Premium Tropical Plant Food. Our 15-5-10 special formula contains a controlled release nitrogen, Fx Iron® , calcium, and other key components to help your tropical plants have healthier growth. Fx Iron® is an environmentally friendly source of iron; promoting new growth and dark green foliage. It helps keep your Tropicals green without staining concrete surfaces. Our Tropical Plant Food is ideal for Bougainvillea, Hibiscus, Indoor Plants, and more. Apply every 30 days from the time of planting.