I boil the vegetable shells and use the water to fertilize, this way I prevent the substrate from being contaminated, but placing lime and ashes seems to me to be a good way to avoid contaminating agents. Thanks for sharing this way of preparing your fertilizer @angelok
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If you boil the vegetable peels, you lose their properties such as vitamins and other nutrients. The correct way is to leave them natural and let the decomposition process take place.
The recommended ash should be from sticks, logs, and wood.
You can add eggshells to your compost. Crush the eggshells into a powder, as this adds calcium.