In any house we can find eggs and almost in any home we can find coffee. You’ll get a very good natural fertilizer by mixing coffee grounds with eggshells.

Coffee grounds

They contain nitrogen, phosphorus, potassium, and many minerals, carbohydrates, vitamins etc.
Coffee grounds are highly valued by plants for which is an acid fertilizer like blackcurrant, conifers, azaleas, roses and some trees.

Eggshells

Besides containing 93% calcium carbonate, they also contain nitrogen, phosphorus, and other items great for soil fertilization.
The shells that remain after eating the eggs are dried and then crushed.

How to apply

Coffee grounds and eggshells can be administered directly or by adding them into compost.
Both the coffee grounds and eggshells may be administered separately, but proved that in combination give the best results.

For potted indoor plants it should be used rationally, once every 1-2 months.