Here is one more. Many flowering plants do not only thrive, but require the pH balance that vinegar can produce. Research which of your plants can be helped by this home remedy based on the soil type they prefer. Then add tiny amounts of vinegar to houseplants. Their soil should be well balanced when they are potted, so they should not need much help to remedy it.
Outdoor plants can benefit much more from vinegar.
If you have not yet had a soil composition study done on your garden, scoop up some dirt and take it to your local nursery. Many nurseries will perform this service free, and then you will know exactly what kind of help your plants need. Whenever you cook food in a large amount of water, many of the vitamins and minerals from your food are leached right into the water. You will know this is true simply by observing the color of your water after you have cooked. Instead of pouring all of those nutrients and water into your sink, set it aside and let it cool.