Eggshells are more than just kitchen waste. They’re packed with minerals—especially calcium—and have a surprising number of uses that can benefit your home, garden, and even your health. Here’s a deep dive into why you should start saving them:
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1. Natural Fertilizer for Plants
Eggshells are about 95% calcium carbonate—a vital mineral for healthy plant growth. When crushed and added to soil, they:
• Improve soil quality
• Reduce acidity
• Provide slow-release calcium to strengthen plant cell walls
How to Use:
• Rinse and dry the shells
• Crush into small pieces or grind into powder
• Mix into soil or sprinkle around the base of plants
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2. Pest Repellent in the Garden
Crushed eggshells can act as a natural barrier against soft-bodied pests like slugs, snails, and cutworms. The sharp edges irritate them and keep them away.
How to Use:
• Sprinkle crushed shells in a ring around garden plants
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3. Compost Booster
Eggshells break down in compost and add valuable calcium to the mix, balancing out other organic materials and helping microbial activity.
Tip:
• Crush them before adding to compost to speed up decomposition
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4. Natural Drain Cleaner
Eggshell pieces in sink drains can help trap solids and gradually scrub pipes clean.
How to Use:
• Drop crushed shells into the strainer over time
• Occasionally flush with hot water to keep pipes clear
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5. Seed Starters (Mini Pots)
The half-shells can be used as biodegradable seed-starter pots.
How to Use:
• Crack eggs carefully and keep half the shell
• Fill with potting soil and seeds
• When ready, plant the whole shell in the soil— it will break down naturally
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6. Calcium Supplement (With Caution)
For humans and pets, powdered eggshell can be used as a calcium supplement. One eggshell contains about 750–800 mg of calcium.
How to Use for Humans:
• Boil shells for 10 minutes
• Dry and grind into fine powder
• Add small amounts to smoothies or food (consult your doctor first)
For Pets:
• Sprinkle over pet food for added calcium, especially for dogs and chickens
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7. Non-Toxic Abrasive Cleaner
Eggshell powder can scrub pots, pans, and stained surfaces without harsh chemicals.
How to Use:
• Mix crushed shells with baking soda and water for an eco-friendly cleaner
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8. DIY Face Mask or Scrub
Crushed eggshells can be mixed with egg white or honey to create a natural skin exfoliant.
Note: Always make sure they’re sterilized before using on skin.
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Final Tip: How to Store Them
• Rinse and dry shells before storing
• Keep them in a container with a lid until you’re ready to use
• Optional: bake at low heat to kill bacteria and make them brittle for grinding
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