Fertilization can be used to promote healthy growth and flowering in Mexican Bush Sage. It is best to fertilize in the spring and summer months when the plant is actively growing. A balanced fertilizer with an NPK ratio of 10-10-10 or 20-20-20 can be used. Apply the fertilizer according to the instructions on the package, typically between 1-2 tablespoons per gallon of water. It is important not to over-fertilize as this can lead to excessive growth and reduced flowering. Alternatively, a slow-release fertilizer can be used, applied once at the beginning of the growing season. This will release nutrients gradually over several months, providing a sustained source of nutrition for the plant. It is also important to ensure the plant is getting adequate water and sunlight for optimal growth and health.