No, plumeria same as hibiscus is a common mix-up, but they are two very different plants. They come from separate plant families and look nothing alike up close. Plumeria belongs to the dogbane family. Hibiscus belongs to the mallow family. The only thing they share is that both grow in warm climates. People confuse them because both show up in tropical gardens, but that's where the overlap ends.
The plumeria vs hibiscus split shows up fast when you look at the flowers side by side. Plumeria has five waxy petals that spiral in a pinwheel pattern and feel thick to the touch. Hibiscus has thin, papery petals that spread wide open with a tall pistil column sticking out from the center. I grew both plants in my backyard for three years and the contrast hit me every morning. Plumeria blooms lasted for days after I picked them. Hibiscus flowers wilted by the next afternoon.
The leaves and branches tell you just as much. Plumeria grows thick, fleshy branches that ooze milky white sap when you cut them. That sap can irritate your skin if you're not careful during pruning. Hibiscus grows thin, woody stems with clear sap that won't bother you at all. Plumeria leaves are long, thick, and waxy. Hibiscus leaves are smaller, thinner, and have jagged edges. When I first started growing them, I mixed up a cutting once and put the wrong one in the wrong pot. The leaf shape alone told me my mistake within days.
Watering and cold tolerance separate these two plants even more. Plumeria stores water in its thick stems and goes dormant in winter. You can stop watering your plumeria for weeks during the cold months and it will be fine. Hibiscus wants steady moisture all year long. If you let the soil dry out too much, your hibiscus will drop its buds and leaves fast. Cold weather hits them both hard, but hibiscus handles a light frost better than plumeria. You need to bring your plumeria inside when temps drop below 50°F (10°C).
The fragrance gap between these two flowers is huge. Plumeria puts out one of the strongest and sweetest scents of any tropical bloom. You can smell a plumeria tree from 20 feet away on a warm evening. Hibiscus has little to no scent at all. If fragrance matters to you, plumeria wins by a mile. That scent is the reason lei makers use plumeria and not hibiscus for most of their work. If you've ever worn a plumeria lei, you know exactly what I mean. The smell stays with you for hours.
Bloom timing is another key split in this tropical flower comparison. Hibiscus can flower all year if you live in a warm, frost-free area. Each bloom only lasts about one day, but new ones open up every morning. Plumeria blooms from spring through fall and takes a break in winter. Each plumeria flower stays fresh for a week or more on the tree. You get fewer months of color, but each bloom gives you more time to enjoy it.
Your choice between these two plants comes down to what you want most. Pick hibiscus if you want year-round color in your yard and don't care about fragrance. Pick plumeria if you want that sweet tropical scent and flowers that last long enough to string into leis. Both plants do well in pots if you live outside their growing zones. Just don't mix them up at the garden store. The care they need is very different from day one, and planting the wrong one can lead to problems fast.
Read the full article: Plumeria Flower: A Grower's Guide
