Use only the broad, green leaves. Taking the stems from a peppermint plant could cause it to die. Unlike other types of essential oils, peppermint oil is technically an infusion. This means that the amount of carrier oil you use to steep your leaves will determine how much you ultimately end up with.
Inspect your peppermint leaves while you’re washing them and throw out any that look diseased, damaged, or discolored. [4] X Research source Giving your peppermint a good preliminary rinsing helps ensure that no foreign substances end up in your finished oil.
You could also set your still-wet peppermint leaves on a clean towel or layer of folded paper towels to soak up more moisture. Your peppermint leaves need to be completely dry before you begin the oil extraction process.
If you prefer, you can also simply tear and squeeze your peppermint leaves by hand. Muddling causes plants to release their natural oils, and is one of the most important steps in making various essential oils at home. Be careful not to grind the leaves too much, as this can cause them to become bitter and make them harder to strain later on. You just want to unlock their aromatic essence, not mangle them. [6] X Research source
It’s crucial that you select a container with a lid that forms an airtight seal, as exposure to air can cause plant oils to spoil. A container made from glass or ceramic will work best, as you won’t have to worry about these materials contaminating your oil the way you would with plastic or metal.
Keep in mind that too high a ratio of carrier oil to peppermint will lower the concentration of your finished oil.
If you live in a colder climate, place your jar near a heat source or inside an insulated cabinet to keep it at the optimum temperature. Warmer temperatures will encourage more of the oil in the peppermint leaves to escape.
Cheesecloth or muslin cloth will provide the best results for straining. Other types of DIY strainers, such as paper towels and coffee filters, may not work well due to the thickness of the oil. Stretching a rubber band around the mouth of the jar will help secure the cheesecloth while you work.
With each round of steeping and straining, you’ll notice your peppermint oil growing darker in color and giving off a stronger aroma. You may not be able to tell much of a difference in the concentration of your oil after about a week.
The shelf life of homemade peppermint oil may vary depending on the exact quantity produced and the amount of plant material left behind. If you notice your peppermint oil developing a strange color or odor after a few months, it’s best to throw it out and whip up a new batch. [12] X Research source
