Yes, you can spray plant food, also known as foliar fertilizer, directly onto leaves. This technique, called foliar feeding, allows plants to absorb nutrients directly through their leaves, providing a quick nutrient boost.

Results vary, but most plants show signs of improvement within a week after application, especially with foliar sprays rich in readily available nutrients. Faster growth and healthier foliage are common indicators.

Side effects are rare if used as directed, but overuse may cause leaf burn, yellowing, or nutrient imbalances. Follow recommended application rates and frequency to prevent issues.

Using plant food spray in winter is generally not recommended, as most plants are in a dormant stage and won’t absorb nutrients efficiently. Exceptions include indoor plants or winter-blooming plants that are still active.