Which plants shouldn't you try this with? Don't add eggshell fertilizer to plants that prefer acidic soil, like blueberries. Ericaceous plants such as mountain laurel, pieris and azaleas also fall into that category.
As it happens, eggshells can provide all the calcium carbonate the soil needs, which helps to lower the soil's pH level and make it more alkaline as opposed to acidic. This is incredibly beneficial for plant growth because many plants prefer to grow in soil that has low acidity.
Plants like tomatoes, peppers and eggplants in particular will benefit from shell fertilizer, Savio said. The extra calcium will help prevent blossom-end rot. Broccoli, cauliflower, Swiss chard, spinach and amaranth are also calcium-packed and could use extra from eggshells.
Wondering what plants don't like eggshells? It's best to avoid using them on varieties that naturally prefer more acidic soil, such as azaleas and geraniums.
So what do Eggshells do? By placing them below tomatoes, peppers, zucchini, and squash, the slow release of calcium will ensure that they do not suffer from blossom end rot otherwise known as (BER). Blossom End Rot occurs when the plant is lacking calcium.
When crushed egg shells are mixed into the soil at planting time, they begin to break down and leach calcium, magnesium and other trace nutrients back into the soil. As this occurs, it allows the roots of tomato plants to soak it up. The more finely you can crush your egg shells, the better.
Calcium is an essential plant nutrient and moderates soil acidity. Fast-growing plants deplete the soil of calcium very quickly so egg shells are an ideal supplement and feed for outdoor flowers, vegetables and fruit trees in your garden.
Primarily a rich source of calcium, eggshells help roses by strengthening the walls of the plant's cell tissue. When rose plant parts are at their sturdiest, they are better able to fight off disease and pests.
In most cases, the grounds are too acidic to be used directly on soil, even for acid-loving plants like blueberries, azaleas and hollies. Coffee grounds inhibit the growth of some plants, including geranium, asparagus fern, Chinese mustard and Italian ryegrass.
Eggshells are packed with generous amounts of calcium and potassium, which orchids need in order to thrive. This trick is super easy. Simply save eggshells and crush them using a blender or a mortar and pestle.
Banana peels contain: calcium, which promotes root growth helps add oxygen to your soil. magnesium, which assists with photosynthesis. sulphur, which helps plants develop strong roots and repel pests.
Boost potted plants
When potting plants, place a few used tea bags on top of the drainage layer at the bottom of the planter before adding soil. The tea bags will help to retain water and will also leach some nutrients into the potting medium.
Clean Eggshells are Safe Eggshells
Eggs are known carriers of salmonella, which should not be present on uncracked eggs that have been well washed, but you never know. Unless the only place the eggshells are going is into the compost bucket, I rinse them well and let them dry in a sunny windowsill.
Boil a gallon of water and add ten to twenty clean, dry eggshells. Let the shells sit in the water overnight, then strain them out. Pour two cups of liquid onto each plant. Repeat the eggshell tea process every two weeks.
Just like in the garden, finely crushed eggshells provide an organic source of nutrition for houseplants, patio pots and hanging planters. Sprinkle the pulverized shells on the soil surface and they will break down over time whether you are using eggshells for houseplants or outdoor containers.
According to some widely circulating advice, they can be disinvited to the party by placing crushed eggshells around plants. The rationale is that crawling over the sharp edges will deter an invasion.
'Your roses, azaleas, lilies, and hollies because they are acid-loving plants that will thrive best in the acidic characteristic of coffee grounds,' he adds.
In most cases, eggshells help improve the soil pH and increase or decrease it to a neutral level. For example, lavender does not enjoy acidic soil. If the soil in your region is acidic, mix eggshells in it to make the soil neutral and tolerable for the plant to grow properly.
The only mineral fertilizer your lavender may need is calcium (in the form of agricultural lime or eggshells). Eggshells have the added benefit of making the soil more alkaline.
While eggshells are compostable and can be added to your kitchen countertop bin or backyard compost pile, using eggshells for plants is also beneficial. They provide important minerals—namely calcium carbonate, potassium, and phosphorus—that can be absorbed by your plant's roots after breaking down.
If you split your eggshells into small fragments, it can take roughly one year for them to break down into the soil. Thrown in almost whole, and you could be looking at several years before they decompose. This slows down the whole composting process, depriving your garden of that sweet, nutritious, earthy goodness.