A very nice flowering vine indeed and perhaps one that will serve you well

I would compare a tropical reef as the only thing that has more color choises to pick from then climatis

the next trick is what time of year do you want to see that color or bi color and yeah some are tri color and then how big do you want that color ( flower ) to be. Thats the hardest part about growing climatis is picking one out

You already know how long it will take climatis to " take off " for the first 2 - 3 years there wont be very much but yeah they will realy take off in there 3rd 4th year whihc is just my experiance wiht one in a 2 quart starter pot ( garden center bought )you may want to re-think the seed idea the color you saw as a flower might not be anything like the plant you get as well no matter what season your flower choise will be the flowers will only last five six weeks MAX on a fuly grown plant

theres a wealth of information on any google search keyword growing climatis it too will guide you to online seelers local garden centers propergating ect ......

Last concern from here is you are also at the southern last zone I am sure you have seen some growing there if not then scratch the idea they will demand cool feet and shaded roots will help especaly for them first four years and the usuall well drained soil right sun info that I know you have heard a million times already

Seeds are not the best way to get started with Clematis. You want a potted plant with a good root system.

Southern US members almost all recommend type III Clematis rather than type II's and I's. Anything with viticella in the name in particular. I've attached an article and a list.

Honeysuckle is so vigorous it will likely crowd out any Clematis. I would rethink putting them close together.

You don't need to worry about shading roots or lower parts of the plant nor keeping them cool, you do need to worry about keeping them moist and well mulched. Somehow in popular plant lore the words moist and cool/shaded got mixed up.

Here is a link that might be useful: Article on growing clems in hot climates