Jobe's fertilizer spikes for azaleas, camellias and rhododendrons are specially formulated to fertilize acid-loving plants. Unlike surface-applied fertilizers that can wash away with rain or watering, Jobe's spikes work underground at the roots. They slowly release nutrients where plants need them most, promoting healthy growth and beautiful blooms. The specially formulated, pre-measured spikes deliver fast, easy and mess-free fertilizer.