Specific growing conditions will often influence just how long any type of clematis will bloom. If you need to prune for another reason, do it after they bloom. As the plant ages, the roots grow, giving the clematis a greater ability to produce more shoots and blooms. To bloom well, Clematis must be able to stretch up into full sun, but to survive summer, its roots have to be in the cool protection of shade. Group 1 clematis bloom very early. Clematis vines can be slow to grow in their first year, because the plant is building its root system. Follow the simple guide below to help you get started and to tell you about some really neat ways to turn your Clematis Vines into beautiful features in your garden! First- Don't worry! If your clematis is fairly new (under 3 years old), appears healthy, yet produces just a few blooms, this can be normal, assuming productive stems have not been pruned away. Clematis are vines that come in a stunning variety of colors and bloom ranges. In the wild, growing up a big plant like a rhododendron provides both the sun up top and the shade down below. How To Grow Clematis. Some vines, such as Sweet Autumn clematis (C. terniflora) or Anemone clematis (C. Montana) grow as long … They’re perennials, blooming in the spring and summer and dying back in the fall and winter, and can grow up to 20 feet (6.1 m) tall with lifespans of over 80 years. Group 2: These are probably the most common kind of clematis and the ones people think of first. Clematis are not as hard to grow as you may think. And some are bred specifically for an extended bloom season - many of the newer Evison clematis are considered repeat or extended bloomers ("free" blooming is the term they use) and even have a unique pruning recommendation as a result. The mature size of your clematis depends on the species. Group 1: These bloom on old wood, so you only need to prune out dead or damaged stems. Size Some mature clematis vines, such as anemone clematis, can grow 20 to 30 feet tall. Once the root system gets established, the growth rate picks up. They are easier to prune than you think, too! In other words, give the kid some time to grow up.