Should azalea fertilizer be used on an oleander?

No, azalea fertilizer should not be used on oleander. Azaleas prefer acidic soil and specific nutrient ratiOS, while oleanders thrive in a wider pH range and have different nutrient needs. It's best to use a fertilizer specifically formulated for oleanders or a balanced, slow-release fertilizer suitable for flowering shrubs. Always check the label for appropriate application rates and timing.