@California Gardening California Gardening: Calcium Products – What is calcium and how to use calcium in gardening November 18, 2018
@Alberta Urban Garden Alberta Urban Garden: How and Why I Use Eggshells to Fertilize my Organic Garden January 1, 2016
@Gary Pilarchik Gary Pilarchik: Understanding Garden Calcium: Dolomitic Lime, Gypsum, Slow & Fast Release, pH effects – TRG 2014 November 27, 2014
@Gary Pilarchik Gary Pilarchik: How to Prepare Eggshells for Use in the Garden: Vinegar & Blossom End Rot – The Rusted Garden 2014 December 29, 2013