Embodiments described herein provide for nanofertilizers having at least one plant nutrient coated onto a metal nanoparticle. Some embodiments provide for a method of making a nanofertilizer including providing a metal nanoparticle and coating the metal nanoparticle with at least one plant nutrient or precursor thereof. In some embodiments, a method of making a nanofertilizer may include mixing a metal salt and a plant nutrient in an aqueous medium to form a solution and adding a reducing agent to the solution to form a coated metal nanoparticle. Some embodiments provide for a boron nanofertilizer and methods of making the same. Some embodiments provide for a method of treating a plant nutrient deficiency, such as, for example, a boron deficiency. Some embodiments also provide for a kit for making a plant nutrient coated nanoparticle.