White Wash is mainly used when your plants are subjected to high humidity environments. You can use White Wash throughout your plants growing and flowering stages. Safe to use until the day of harvest. White Wash CAN NOT be stored on concrete, as it will drain frequencies from the product. It must be stored on something insulated preferably a piece of wood such as; a pallet. Storing it above ground on your regular shelves metal racking or otherwise is fine. This product has a 3 year shelf life even after opening as long as the product is resealed and kept below 80F or 27C, to avoid evaporation.