I have a friend that has a clematis that has never bloomed. Pests and Other Problems. Hi, all, this is my first posting here. Clematis often take a good long time to get mature enough for flowering. While there are compact cultivars that grow just 3-feet tall, other clematis can reach 20-feet or more. Clematis also can grow well in a wide range of soil pH values, but a more acidic soil or planting medium can enhance flower color that seems flat or not vibrant. Clematis only flowering at top. Pruning clematis. Fertilizers for clematis. Tweet. Joe happens to be a male vine (dioecious) and therefore will never set seed and can only be propagated by cutting, according to the Plant Files. Clematis are naturally robust and easy to grow – once you’ve sorted out the pruning mystique! My clematis Comtesse de Bouchard is not blooming this year. StrettonFox Posts: 7. Flowering times can be late spring, summer or fall, with re-blooming types flowering both early and late in … They require no regular pruning except for the removal of faded flowers. Pruning time depends on the type of clematis. It is an established clematis at least 3, if not 5 years old. I moved into my present house two years ago and inherited a huge clematis which was planted against a fence but had grown to the top of a conifer about twenty feet tall. Varieties with small flowers blooming in winter and spring (cirrhosa, armandii, alpina and macropetala) will be pruned after flowering. Last year it bloomed great. This group comprises the early-blooming clematis that flower on shoots produced the previous season. Pruning Group 1. These are good fertilizers for clematis: There are not even any buds but it is growing like a weed. Clematis: A colorful introduction to cultivars of Clematis. My lessons in how to fertilize clematis taught me that, for best flowering, clematis thrive on 10-30-20. It should keep your clematis … July 2015 in Plants. Become a Partner. It produced masses of white flowers in early June. There are clematis flowering here from early spring to well into the autumn, following one another according to their types. But … For others, prune late winter cutting back one or two older branches to 30-40 cm. If you know the type and/or name of the clematis that might give an idea as to which time of year it might flower when it does get big enough. Clematis Not Flowering. 1230 Views Save Print Email. Established clematis fit into three main pruning groups consistent with flowering times. For Group 3 cultivar selections, make sure to check out our guide: 19 of the Best Summer Flowering Clematis for Your Garden.