I have untangled two large-flowered clematis,2 months ago,and trained them along wires on a south facing wall. Be sure you use a low nitrogen fertilizer on your clematis since too much nitrogen can cause all vine and no flowers. They are planted about 4-5 feet apart,and the roots are protected by a mulch of small stones. United Kingdom . If your... Continue Reading. Hey I'm Mark. Tag: Clematis not flowering. (How to Solve it) Why is My Clematis Not Blooming? You can cut these to the ground in early spring and you will still get plenty of summer bloom. The summer flowering clematis, like the deep purple ‘Jackmanii’ and the tiny flowered sweet autumn clematis, bloom on new wood. But another reason may well be because it is too dry. Help answer a question about Why is my clematis armandii not flowering? Also, help answer other questions about General Gardening and Clematis Plants, and plants at GardeningKnowHow.com (How to Solve it) Clematis is a hardy perennial climbing vine with many different cultivars which typically flower in late Spring and early Summer with some varieties blooming again later in the season. Flower styles also vary from big, star-like singles to frilly doubles, delicate miniatures and even lovely bell-shaped blossoms. My Clematis is not Blooming. Then there’s a whole confusing group of clematis that bloom more than once during the season on old wood and on new. (George Weigel) clematis.Wisley6-15.jpg. I have watered them both regularly,but not excessively,and fed them with a weak feed every 2 weeks. Flowering times can be late spring, summer or fall, with re-blooming types flowering both early and late in the season. I fertilize all my clematis with organic, slow release fertilizers in the winter when I prune my group three clematis, usually in late February or early March. Clematis Cirrhosa not flowering. Any pruning of these early flowering clematis should be done immediately after they flower. Clematis vines are beautiful bloomers -- if conditions are right to encourage flowering. About Us. While there are compact cultivars that grow just 3-feet tall, other clematis can reach 20-feet or more. - Gardening Know How Questions & Answers. And then there’s color! I have had 2 Clematis for two years now one either side of a Garden Arch..they have reached each other no but not a sinlge Flower nor Bud to be seen (Image) I have not over fed them..have kept them watered when it was dry weather..one is Ernest Markham and the other another popular one (slipped memory now but similar flowering period) anyone any ideas why it hasn't flowered? link to Why is My Clematis Not Blooming? By Jonathanhales. It could possibly be one and a half years old. My Clematis Cirrhosa is about two years old (I think). It is starting to make spring growth about now. This one is called Wisley. I had earnestly hoped that it would flower for me this winter, but it hasn't.