Jackmanii clematis is one of the easiest types of clematis vine to grow. It requires little more than cool roots, plenty of sun, and water. And while many types of clematis are complicated to prune, pruning Jackmanii couldn’t be simpler. The most important thing to remember is that Jackmanii flowers appear only on new growth. Prune Jackmanii in February or March.
Select a pair of sharp hand pruners. If the blades of the tool are dull and make cutting difficult, either have the blades sharpened or invest in a new pair of pruners.
Disinfect the sharp hand pruners with a mixture of one part bleach and three parts water. Rinse well.
Measure about 2 or 3 feet up from the bottom of the plant, using a yard stick or measuring tape.
Cut back the outermost vines no higher than 3 feet and no lower than 2 feet from the ground. Cut back any remaining vines to the same height.
Always use sharp, clean hand pruners. This reduces the risk of introducing disease to the plant.
According to North Dakota State University’s Extension website, it is acceptable to prune Jackmanii to the ground, but this may create a more vigorous and large plant than some gardeners desire. Just remember: The more severely Jackmanii is pruned, the larger and more productive it is, because Jackmanii blooms on new growth.
When pruning, don’t be afraid to remove any buds that may be present. Hard pruning greatly encourages Jackmanii to grow and bloom more profusely. It is also unnecessary to prune back to a bud or nodule.