A few passi sources include
Brushwood Nursery http://www.gardenvines.com/sho...
Grassy Knoll http://gkexoticplants.com/
Georgia Vines http://www.georgiavines.com/
The only one of these I've ordered from is Logee's and the plants were excellent when they arrived. They are in Ct. so the plants have a short ship time.The others I window shop and wish for a greenhouse to put them all in.... I have purchased my not-a-raffle raffle tickets hoping to place an order with Brushwood Nursery
Depending on which passi you choose you should see blooms the first year, most grow very quickly to bloom size. Some will even bloom when brought in for the winter if given enough light, P. citrina and P.' Lady Margaret' have both bloomed during the early winter here.
Incense and Inspiration are from the same crossing, P. incarnata x P. cincinnata, but they are not the same hybrid and have differences noted not only in their registration but in general information. Incense is said to be more cold tolerant than Inspiration, although I've never tested this. The flowers of Inspiration can appear to be a deeper more vibrant shade of purple and the corona fuller maybe due to the slight color difference. Another difference is all clones (or cuttings) of Incense have a virus from the original hybrid plant. The virus doesn't hurt the plant or make it any less desirable for growing, but under stress affects the leaves with yellow spotting. The virus can be transfered to other passi's in a collection ( dirty tools etc.) so if you grow it just keep it seperate from your others and be sure to sanitize tools.
The hummingbird pollinated passi's are from the Supersection Tacsonia and have pendant flowers with long floral tubes. They do have specific cultural needs. Most growers/suppliers should be able to help with info and advice on growing and caring for them.