I've researched it to see what I need to be doing or what I should have been doing for it. (1) It needs full sun. I figured that. (2) It needs something to climb onto. Something tall that has less than 1/2 inch diameter rails to attach itself to. I figured that, also. But I had not given it anything to climb on. Research says that if the vine has nothing to attach itself to for climbing, it will stop growing. Umm, I didn't know that. And (3) needs moist well drained soil..
Also, they usually aren't mature to start blooming until 2 years old. Which is why, I guess, mine is ready to bloom now. Certain varieties do grow well in pots. The larger varieties should be planted in the ground because they will reach 10-20 feet. Umm, I don't know which variety I have.
So I scrounged around till I found an object I can use as a trellis for my clematis. If I follow my research and give it what it needs I hope to have this is the future.