Most calcium salts have very low solubility in water at the pH your plants like. CalMag is cheap. You'd spend more money on the pills and more time messing with them than if you'd just gotten a bottle of calmag.
If you want to go organic, mix bone meal (CaPO4) into your soil before planting. It's slow release and will prevent Ca def and help flowering.
stinkyattic Reviewed by stinkyattic on . Diluting Calcium I belive I have a calcium deficiency and was wondering rather than CalMag or other products, can I purchase powdered calcium at the drugstore and dilute it? Rating: 5