Q: What is usually recommended dosage for potted plants for the two foliar spray and adding in potting blend? A: five to seven gm/liter h2o. make this Remedy and spray or do drenching. Q: What is the expiry day ?? A: It doesn't have expiry day. Having said that, we recommend to use it within 3 yrs of producing day. Q: Can this Epsom salt be useful