I grow this in one of my flowerbeds. Most people don't. But, the flowers on it are spectacular in smell. They actually grow right by our patio door because they have such a great smell and because the plant itself has a very specific purpose in our garden. They don't need ANY special care at all. They don't get direct sunlight in our yard but they are currently around 5 ft. tall.
Because of its specific purpose, it gives us a dual benefit for nature study (and not just the little ones!). We all enjoy it.
Do you know what it is?