These once-a-year spikes help maximize the size and color of your aquatic pond plants. Well-balanced, 16-9-12 feeding formula has low phosphorus and no copper, so it won't impact pond water quality. Innovative, temperature-activated spikes release nutrients only when aquatic plants and flowers need them most - at or above 50 degrees Fahrenheit. Slow-release fertilizer spikes lasts for one full year and are ideal for hassle-free nutrient supplementation of aquatic or marginal plants grown in pots or planting baskets. Available in Regular and Mini. Regular Fertilizer Spikes measure 7" and Mini Fertilizer Spikes measures 3-1/2".
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