When a plumeria is established and growing in nutrient-rich, well-draining soil, fertilizer isn’t necessary. If you grow plumeria in a container, fertilize monthly with a high-phosphorus fertilizer.

Protect the plant from temperatures below 50 degrees. Fertilize potted plumeria once a month during the active growing season. Dig a wide, saucer-shaped whole that is at least three times as large ...