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Is eggshell fertilizer suitable for all plants?
Eggshell fertilizer is useful for many plants, but not all. Eggshell fertilizer can help fruit species and vegetables, such as apples, strawberries, lettuce, cucumbers and eggplants. It also highlights certain flowers (perennials and annuals), such as roses and chrysanthemums. Eggshell fertilizer is great for succulents, but it lacks nitrogen, which some succulents may need. On the other hand, excess calcium in eggshell fertilizer can harm some outdoor and indoor plants. It can cause disease in geraniums, violets, azaleas and other acid-loving plants. Avoid using eggshell fertilizer on kale, beans and spinach.
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3 Ways to Make Eggshell Fertilizer
Eggshell fertilizer can be prepared by several methods.
Crush the eggshells. Wash and rinse the eggshells and let them dry. Crush the eggshells into a fine powder using a mortar and pestle, rolling pin, or food processor. Be sure to wear a mask when crushing the shells to avoid breathing in eggshell dust. Mix eggshell powder into your flower bed, houseplant potting mix, or garden soil.
Grind the eggshells. If you don’t have a food processor or hand tools, you can use a coffee grinder to process eggshells into powder. Add ground eggshells to your compost bin to make mulch or pour them directly into the planting holes. Many gardeners add coffee grounds, rich in nitrogen and potassium, to eggshell fertilizer for additional nutrients.
Infuse the eggshells. You can use eggshells to make a fertilizer tea that will add liquid calcium to your garden. Boil a liter of water and add ten or twenty clean, dry eggshells. Let the shells sit in the water overnight, then filter them. Pour two cups of liquid over each plant. Repeat the eggshell infusion process every two weeks.
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