You might want to research the different types of Hoya plants. Certain types of hoya are pretty floriferous. Hoya lacunosa is one that is fragrant and seems to bloom frequently for people. However, most plants only bloom during a certain season and won't bloom continuously, especially indoors, so your best bet for constant fragrance may be to try growing some herbs on your windowsill. Basil can be grown indoors pretty easily. Rosemary plants aren't the easiest to grow indoors but it seems like some people can do it. This post was edited by summersunshine on Sat, Sep 20, 14 at 12:01

I just planted some this year but no blooms yet. I've smelled fragrance on some at the nursery every time I've given them the sniff test. I'll let you know when one of my buds open. I bought mine from High Country Garden. Yours are VERY pretty! I love the big flat cone and the thick line of petals.

How about lilies, lilacs, hyacinths, lily of the valley, roses, lavender and rosemary. I even have a yellow bearded iris that is VERY fragrant. Sorry I don't know the name. Roses, lavender and rosemary can be strong or mild smelling. Just choose a strong smelling type. And although lilacs can get big, there is a dwarf variety that only gets about 4 feet tall and wide. Oh, and for the evenings and early mornings, try Plantaginea hosta. It's a very fragrant, night-blooming type that blooms in August. And sweet autumn clemitis is a fragrant climbing vine that blooms in late summer/fall. Good luck. Diana Lynn

I just came across an article saying that the trees from which Frankincense is collected are in a serious declne: https://www.nytimes.com/2019/07/05/science/frankincense-trees-collapse.html    > Frankincense is exported by the thousands of tons each year. But as demand increases, over-exploitation and ecosystem degradation are bringing populations to the brink of collapse. The study’s authors estimate that without new trees to replace the old, half the intact forests — and half the frankincense they produce — will be gone within 20 years.