Roots Organics Elemental Supplement 20% Calcium 4% Magnesium Fertilizer， 3 lb.<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Macronutrient and micronutrient supplement</li><li>Specifically created to augment calcium and magnesium levels and prevent deficiencies that can occur with fast-growing plants</li><li>Results in more vigorous plants and larger yields</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51M4cfvbQyL.jpg" noproxy>