Companion planting harnesses the properties of one plant to enhance the growth and health of another. Essential Oils are the communication and immune system of a plant. Being able to use the essential oil of a companion plant can have benefits in some cases. Mix 6 drops of essential oil to 2 gallons of warm water, stir and let it cool. When watering use one half essential oil water and half cold water. Use Basil essential oil for tomatoes, peas, broccoli, asparagus and roses. Use Peppermint & Lemon Essential Oil-for plants suffering from aphids, spiders or mold. Check out our essential oil gardening classes.