A:Answer Our Liquid Plant Food is the same proven, patented nutrients that we’ve used since the beginning – the result of 6 years of intensive testing in our grow lab. Our nutrients contain no harmful pesticides or herbicides. AeroGarden Liquid Plant Food is made from mineral salts that provide iron, calcium, magnesium, and other “vitamins” that all plants need to flourish. We have developed a mixture that provides exactly the right amount of nutrients for your plants. Our Liquid Plant Food is derived from sources that ensure high levels of consistency and purity. Please contact our Customer Service Department if you have any other questions or concerns.