Formulated specifically for your azalea, camellia and rhododendron plants, these fertilizer spikes were made to nourish your acid-loving plants. Because you can stick these spikes directly into the ground, you eliminate product runoff while giving your plants roots a more direct route to nourishment. These fertilizer spikes have pre-measured slow-release fertilizer for an easy and mess-free application. Get bigger and longer-lasting blooms from your acid-loving plants with our pre-measured 9-8-7 NPK ratio fertilizer.