Favored essential oils for candle making, especially to check the boxes of low risk and low cost, are lavandin, lemongrass, benzoin, lime, ylang ylang, geranium, orange, spearmint, lemon-scented eucalyptus, patchouli, spruce and pine. Clove and cinnamon can also be used at low concentrations and can be blended with a citrus oil.
Lavandin is simply a stronger lavender oil. It is also a bit less expensive for the application of candlemaking. Good quality lavenders can make your candle cost skyrocket when, essentially, you will be burning the final product!
Lemongrass is a great alternative to citronella as it isn’t as soapy, the same goes for lemon-scented eucalyptus. These can both be blended with geranium for a strong, long-lasting fragrance! Lime might be the best choice for your citrus note, but most citrus oils peak late and disappear early, so keep that in mind when pouring money into citrus essential oils! You can blend several Orange oils together for a complete, longer lasting citrus fragrance.
Clove and Cinnamon are holiday favorites, and you can add Spruce or Pine for an enjoyable holiday blend. If you are wanting to use Clove or Cinnamon for different times of the year, try to create a new scent by adding citrus notes or strong floral like geranium or ylang ylang.
Spearmint has a fresh, very herbaceous note and can add a lovely cool touch to your candle. Unfortunately, Spearmint and Peppermint don’t last very long and might not be the best choice alone. Patchouli will give you the earthy, first rain, smell you have been looking for! And to finish all of your candles, ylang ylang will smooth out most blends.
As for vanilla, my personal favorite, you will have to be creative if choosing the essential oil route vs the synthetic, fragrance oil, route. Benzoin might be your closest choice to vanilla. Benzoin is similar to molasses in the respect that it is sticky and dark and needs to be warmed to flow. Peru Balsam might also be considered for your vanilla note.