In the ongoing quest to reduce waste and live more sustainably, gardeners have discovered a secret weapon that’s likely hiding in their kitchen right now—eggshells. These often-overlooked breakfast remnants can be a game-changer for plant health, both indoors and out. But how exactly do they work, and what’s the best way to use them? Here’s everything you need to know about harnessing the power of eggshells to make your garden flourish.
The Benefits of Eggshells for Plants
The primary component of eggshells is calcium carbonate, a nutrient that strengthens plant structures, particularly for crops like tomatoes that are prone to calcium deficiencies. Frank McDonough, a botanical information specialist at the Arboretum of Los Angeles, advocates for adding crushed eggshells to any garden or indoor plant setup that utilises compost. “There’s no downside,” he explains, noting that DIY compost can often be too acidic, especially for vegetable gardens. Adding eggshells not only balances the pH but also provides essential nutrients like calcium, potassium, and phosphorus.
How Eggshells Help Combat Common Plant Issues
One of the major benefits of eggshells is their ability to prevent blossom end rot. This condition, caused by a calcium deficiency, primarily affects tomatoes and manifests as dark or water-soaked spots on the bottom of ripening fruits. While regular watering can help, adding calcium to the soil—via crushed eggshells—offers an effective preventive measure. The key, however, is early application, as the condition can’t be reversed once it appears.
DIY Eggshell Fertilizer: A Simple Recipe
Making your own eggshell fertilizer is as easy as saving, drying, and crushing eggshells from your kitchen. Smaller pieces break down faster, so pulverizing them is the most effective way to ensure the nutrients reach your plants quickly. According to research by the Alabama Cooperative Extension, applying powdered eggshells directly to the roots of plants has shown measurable improvements in calcium absorption.
Which Plants Benefit Most from Eggshells?
While most plants will benefit from the calcium boost eggshells provide, certain crops are particularly well-suited to eggshell fertilizer. Tomatoes, eggplants, peppers, broccoli, and leafy greens are prime candidates, as they thrive in a slightly alkaline environment. Eggshells also help lower the pH level of the soil, which these plants favour.
Plants to Avoid Eggshell Fertilizer With
Not all plants will thrive with eggshell fertilizer. Those that prefer acidic soil, such as blueberries, mountain laurels, and azaleas, may not respond well to the alkalising effect of eggshells. If you’re unsure of your plant’s needs, it may be worth getting a soil test to determine the acidity or alkalinity before adding eggshells.
How to Make Eggshell Water for Plants
For those who want to avoid sprinkling crushed shells directly on their plants, eggshell water offers an easy alternative. Simply soak crushed eggshells in water for several days, then use the nutrient-rich liquid to water your plants. This method allows calcium to leach into the water, making it easier for plants to absorb.
Other Uses for Eggshells in the Garden
Eggshells aren’t just beneficial for boosting plant growth. They can also serve as natural pest control, helping to deter slugs and snails when scattered around the base of plants. Additionally, eggshells make excellent seed holders and can be added to bird feed to provide extra nutrients for garden wildlife.
Final Thoughts
Eggshells may seem like a small contribution, but their impact on plant health and growth is undeniable. By integrating this simple gardening hack into your routine, you can enrich your soil, combat common plant ailments, and even reduce household waste. The best part? It’s entirely free, making it a win for both your garden and your sustainable lifestyle goals.
Whether you’re growing tomatoes, peppers, or simply keeping your houseplants happy, eggshells are a valuable resource you won’t want to throw away.
