Implement early morning or late afternoon to lessen odds of burning. Always water after application to move the solution to the rootzone. With really hard water irrigation the soil is alkaline. It takes time to decreased the pH. This EDDHA iron saved the gardenias from chlorosis. I tried the EDTA https://erickqizrg.humor-blog.com/32750032/a-secret-weapon-for-fe-edta-for-kandahar-farming-regions