Yes, you can use a general-purpose, balanced fertilizer for Plumeria. Look for a fertilizer labeled with an equal or slightly higher phosphorus content (second number in the N-P-K ratio) to promote flower production. A 10-30-10 or 10-45-10 formulation is suitable for Plumeria. However, avoid using high-nitrogen fertilizers, as excessive nitrogen can result in lush, leafy growth at the expense of flowering. Slow-release granular fertilizers are convenient and provide a steady supply of nutrients over time. Liquid fertilizers can be used for more frequent applications, especially for potted Plumeria.