This method takes the longest amount of time, but it is one I have used often.
To make cold oils begin with fresh herbs, plants or flowers, just as in the directions above for warmed oils.
Pack the herbs/flowers in a very clean, dark glass jar (blue, green, or brown glass are possibilities), and add just enough oil to cover the herbs. You’ll need to be patient for this step; it will take a few minutes for the oil to settle completely in the jar. Add more oil, if needed (and it probaby will be), once the first pour has settled.
Screw the lid on lightly and store in a cool dark place.
Once a day, at least, check on the oils. Swirl them around in the container well and then allow to sit. Every Time you swirl the oil and herbs, you can recite your spell or incantation.
At the end of one week check your oil. If the desired scent has not yet been achieved remove the herbs and replace with fresh herbs.
Repeat this process for at least three weeks or until desired scent is achieved.
When desired scent is achieved strain the oil and pour into containers. With this method, you can use a collander to strain the herbs from the oil, if you wish. If you really want to get the most out of your herbs, after straining them, pick them up and squeeze any liquid from them back into your jar.
Store your oil in a clean, sterilized jar just large enough to completely hold the oil. There should be no chance of air being trapped inside the jar with the oil!
Be sure to label your oils, just as you do with the other methods.