Ask the head gardener: How can I get my clematis under control?
Dear Tom,
I planted a Clematis 'Mayleen' by my fence about three years ago. It has grown rapidly, and this year had an abundance of beautiful pink flowers. Now the plant is growing on and on and looks a mess – and my neighbour doesn't like it growing over the fence.
Also I have rose bushes planted near the clematis and the new shoots stick to the roses. I would love to have some advice on how to prune it, or what to do with it.
– Eva
Dear Eva,
It makes a pleasant change to receive a question about a plant that is growing too well, but on this occasion, that doesn't mean that there are not a number of issues. Clematis enjoy growing in a sunny position (such as next to the fence that you provided for your 'Mayleen'), and like their roots to be in more cool and moist soil conditions.
The spot that you have provided in your garden is perfect, which is why this vigorous climber is looking quite at home. Clematis montana (of which 'Mayleen' is a cultivar) sits in a collection of clematis known as Group 1. This group is characterised by its early flowering and quite often has a number of very vigorous species within it. As these clematis grow rapidly year on year, they soon outgrow most domestic situations such as fence panels. They should be pruned immediately after flowering, enabling them to put on fresh growth that will then produce flowers the year after.
The way that I see it, you have a couple of options. The first is to rejuvenate the plant by cutting it down close to the base. A healthy Clematis montana often responds well to this treatment. This will trigger lots of fresh growth from the base that can then be trained to cover the fence with more growth towards the bottom of the plant. Immediately after flowering next year, shear off the stems so that they are tight against the fence, which will encourage fresh growth and keep the plant more compact.
In all honesty, this clematis might be too big for that spot, but this pruning style is a way in which you might be able to keep the plant growing in that part of your garden for a number of years to come. There is potential to shear off the growth that has flowered in a less severe manner, but that will not be as conclusive as the rejuvenation technique.
Looking at the other end of the extreme, an acceptance that this Clematis montana is too big for your fence will result in the opportunity to plant a brand new clematis that perhaps is more compact and suitable for that spot. Group 3 clematis flower later in the year on growth that is produced that spring and summer. Clematis viticella types can be very decorative and I find the easiest to prune because they simply get taken down to the ground each spring. Clematis tangutica, with its yellow flowers and gorgeous seed heads that persist into the winter, is another option that you could look at, being better-behaved than your monstrous montana.
If you're looking to replace your clematis, then incorporate a couple of wheelbarrows of well-rotted compost or manure to reinvigorate the soil and encourage lots of strong growth from your new plant, and make sure to water it well for the first summer.
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