Neem oil has the tendency to solidify or crystallize at cooler temperatures due to its composition. Neem oil is a complex mixture of various components, including fatty acids, triglycerides, and other compounds. Some of these components have higher melting points than others. When the temperature drops to a certain point, the fatty acids and triglycerides in neem oil start to crystallize and solidify. This is similar to how some cooking oils, like coconut oil, can solidify in cooler temperatures. The specific temperature at which neem oil solidifies can vary depending on the exact composition of the oil and the processing methods used. It's important to note that the solidification of neem oil does not affect its effectiveness. When exposed to warmer temperatures, neem oil will return to its liquid state. To use solidified neem oil, you can gently warm it by placing the container in a warm water bath or in a warmer room. Avoid using direct heat sources, as excessive heat can degrade the oil's beneficial properties. If you're using neem oil in a product that requires it to remain in a liquid state, such as an foliar spray, you might need to gently warm and mix the oil before use. Always store neem oil in a cool, dark place to help prevent or minimize solidification.