Crab & Lobster Shell Organic Fertilizer 5-3-0 (4 lb)

Neptune's Harvest Organic Crab & Lobster Shell fertilizer is a dry organic plant food rich in calcium and magnesium, intended to nourish plants and improve soil health.

• The description claims that calcium strengthens cell walls and promotes plant vigor.
• The description claims that adequate calcium levels can prevent plant diseases.
• The description claims that magnesium is essential for photosynthesis.
• The description claims that a magnesium deficiency can cause yellowing of leaves and reduced growth.