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CalciumOne could add crushed Oyster shell (fed to chickens to help harden shells on eggs). But if your calcium is locked up in the soil due to an imbalance this won't help. You could try epsom salts to add magnesium first. There must be magnesium in the soil to help the plants take up calcium.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?