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Last updated on January 21st, 2020

Happy and otherwise thriving clematis vines will give your garden a collection of stunningly colourful flowers, but when things are not going well for the clematis, it might not bloom. It can be difficult when things do not go as planned, and even more challenging to figure out why your clematis won’t bloom. Clematis are generally easy to grow and produce masses of stunning flowers but there are times when they want seems to produce flower buds and flowers.

In order to encourage flowering, you need to determine the cause behind the lack of flowers.

Growing and planting clematis

Too much fertiliser causes the clematis to concentrate on producing foliage

Improper feeding is the most common reason that a clematis doesn’t produce flowers. Most of the time the problem isn’t that you aren’t giving your clematis enough fertilizer, it’s that you’re giving it too much. As a rule, most clematis will do well if you give them a mixture of 5-10-10 in the springtime in conjunction with a layer of compost.

You can give them a water-soluble fertilizer once during the Spring and again during the summer but if you give them too much fertilizer, and too much nitrogen specifically, it can reduce or eliminate entirely the blooms you get.

We recommend you buy a specialist clematis fertiliser and follow the instructions carefully to prevent overfeeding.

Our recommended clematis fertiliser

Vitax Ltd Clematis Feed Fertiliser
  • Balanced fertiliser that provides the nutrients that are vital for vigorous growth
  • Supplied in pelleted form, it is easy to handle and apply
  • Suitable for Clematis and other climbing plants

Learn more about feeding clematis in this guide by clicking here

Young clematis can take a couple of years to flower

Another reason your clematis doesn’t produce the flowers you want could be age. If you have a brand-new clematis, be patient, especially if it was a young plant or cutting. Sometimes it takes a few years for the plants to really establish healthy roots. It can take one or two years for a brand new, healthy clematis to produce blooms and even longer to reach maturity as it concentrates on establishing a root system.

On the other hand, if you have an old or plant which you have had for years, it simply might be at the end of its life span unable to produce any more flowers. One way to help find balance is to rotate new and old clematis accordingly so that older plants are replaced with newer plants a few years in advance which allows for the older plants to finish out flower production while the newer plants are establishing themselves.

Clematis need plenty of sun but like to have their roots shaded

Remember that clematis like to have the top of the vines in the sun with the roots in the shade. This is a very important rule. So, sunlight exposure and lighting could be a problem and if your clematis isn’t doing well make sure you protect the roots. Too much direct heat and sunlight around roots could reduce flowering. You can help this by planting some perennials around the base, add a layer of gravel around the base or using some wooden shingles propped up around the stem to create a protective tent.

Again, on the other hand, if your plant previously bloomed just fine and now it isn’t, check to see if maybe a nearby tree or shrub is currently blocking the amount of sunlight it once received. You might need only a quick trim for the plant to get better access to sunlight.

Correct pruning

A question we get asked is When to cut back clematis? the answer is not always straight forward and it really depends on what type you have and when it flowers

Speaking of quick trims, improper pruning is another reason that certain flowers don’t manifest. There are two very specific types of clematis, one of which produces flowers on the wood from the previous growing season and if you conduct heavy pruning in the springtime you might accidentally cutaway that older wood that you need to produce flowers.

The other type of clematis will produce blooms on the current year’s wood but if you don’t know which type you have, it is best to avoid pruning until late in the spring so that you can figure out where the flowers are growing and therefore which wood you can cut.

Learn more about how to prune clematis in this step by step guide

Making sure that you plant your clematis appropriately with the right amount of sunlight, the right amount of fertilizer and the right type of pruning will go a long way towards ensuring proper blooms year after year.

Image credits – Shutterstock.com

Last update on 2021-03-29 / Affiliate links / Images from Amazon Product Advertising API

Author

Welcome to my site, my name is John and I have been lucky enough to work in horticultural nurseries for over 15 years in the UK. As the founder and editor as well as researcher, I have a City & Guilds Horticultural Qualifications which I proudly display on our About us page. I now work full time on this website where I review the very best gardening products and tools and write reliable gardening guides. Behind this site is an actual real person who has worked and has experience with the types of products we review as well as years of knowledge on the topics we cover from actual experience. You can reach out to me at john@pyracantha.co.uk

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