Plant supplements that promote plant growth and production and aid in the protection of plants from environmental stress factors such as wind, heat, cold and drought are disclosed. The plant supplements comprise calcium, magnesium and plant-available silica, most typically in a single liquid non-coagulating solution. Optionally, the plant supplements may further comprise iron, nitrogen, willow tree bark extract, humic acid, fulvic acid, aloe vera, trace minerals, electrolytes, beneficial microbes and/or other non-plant food ingredients. Aspects of the present invention also provide methods of formulating and administering plant supplements for promoting plant growth and production, and for protecting plants from environmental stress factors.
