Why would a Clematis not bloom?

I have this Clematis for several years, it climbs and climbs and gets bigger and bigger, but never blooms.

I have the same plant at my other house 40 miles away and it blooms and is great.

My friend has the same plant and lives 5 miles from the original plant that does not bloom.

Any clues as to what might be happening?

Do you know the name of the clematis?

Do you prune it? What clematis group is it in?

I remember it to be purple. I pruned it once. Don't know anything more about it.

It is the same plant as the one I have in Saugerties. As I recall it is the Mother, a section I took to Saugerties. That one blooms this does not.

Thanks.

What sort of sun/shade do the nonblooming ones get vs the blooming ones? Could be the ones that don't bloom aren't getting enough sun.

I would say the sun has not been a factor. They both are planted in areas where there are tall trees but there is no shade that would cause them to not bloom. On the other hand, my friend has one that is in full sun all the time, and always turns brown and the leaves fall off, also causing the stems to become brown as if they are dead. Her plant blooms yet looks like it is dying.

Oh the feather like things produced by the flower, are they the seeds, and if so, how long does one wait till the feathers are ready to pull off the vine?

Thanks

Nancy.

There are a number of reasons that clematis will not bloom. If a plant is fertilized with a high nitrogen fertilizer you will get a lush vine at the expense of flowering. A Clematis that is only 2-3 years old may still be developing it's root system but you stated it was several years old but even young vines should produce a few flowers. Some types of Clematis bloom on the previous years growth so if this is pruned away that can affect flowering. You also stated the Clematis was planted in proximity to trees. Is it possible the trees are out competing the vine for nutrients? The "feather like things" are attached to the seeds. If you remove them before they ripen they will not germinate. Wait until the seed turns brown and with a little tug on the feather the seed will pull away easily. They must be stratified before planting by placing them in the refrigerator for 3-4 months.

Thanks for the advice. There is trees close, but then both properties have trees where the clematis is. Who knows this year I just might cut them way back and see what happens.

Again. Thanks for the advice all.

Nancy.

Have you paid attention to how many hours of sun each one actually gets? Just knowing that there are trees around on both properties doesn't tell you that they both get the same amount of sun--depending on where the sun comes from vs where the trees are you might find that the one that's not blooming actually gets quite a bit less sun than the other.