Neptune's Harvest, 4 LB, 2-3-0, Organic Crab Shell, N Excellent Dry Organic Source Of Nutrients, Including Calcium 23% & Magnesium 1.33%, Retains Moisture In The Soil & Builds The Organic Matter & Gives The Roots Something To Grab Onto & Wrap Around, For A Food Source, Creating A Deeper Root System, High In Chitin, Kite-En, Which Promotes The Growth Of Chitin Eating Bacteria In The Soil, Will Help Eliminate Ants, Grubs, Fungus & Root Nematodes & Will Keep Slugs & Snails Off, Helps Choke Out Weeds & Keep Moles, Voles, Mice, Etc, From Digging Up Bulbs & Root Vegetables, Bag.