If you want to know which essential oils you can use from your garden by infusing the leaves or flowers in oil, just go out there and notice which ones have a distinctive scent. Rose petals, lavender, Bay, the other culinary herbs, Southern Wood and many others can be used. I fill a glass jar with whichever oil I am going to use and then pour oil into the jar and leave it on a sunny windowsill for about four weeks. You will find that some oils are quicker than others and the size of the jar you use will depend on how much you are likely to use the particular infused oil as well as how much of the plant is available. – I could easily fill a gallon jar with bay leaves, a good sized Kilner jar with Lavender and slightly smaller jars with lemon balm and smaller still for some others.
The advantage of this is that the oil does not have to be heated as in the distillation process. The disadvantage is that the shelf life will be much shorter and with the exception of bay leaves (the plant used in making laurel wreathes by the ancient Greeks) they are only available at certain times of the year.
So why not enjoy the therapeutic benefits of essential oils fresh from your garden where you don’t have to rely on certification by the soil association or other body to guarantee that chemicals have not been used in producing your oil?