Why Choose Jobe's Houseplant Fertilizer Spikes?. Keeping your houseplants vibrant and healthy has never been easier. Indoor Plant Food Sticks - Jobe's Slow Release Fertilizer Spikes. Slow Release Formula: With a precise N-P-K ratio of 13-4-5, Jobe’s spikes provide your houseplants with continuous slow-release nutrition for up to 2, supporting their health and vibrancy.
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