Clematis Care: Growing Clematis in Garden Pots and Planters
Growing Clematis In Garden Pots and Planters
Growing plants in garden pots and planters or containers is a method of gardening that has become increasingly popular in recent years. This is partly because modern gardens tend to be much smaller, but also because nowadays there are so many different types and styles of container available, which means gardeners can be increasingly creative and adventurous in their choice of plant.
The choice of clematis depends on the manner of growth. Vigorous species such as Clematis montana will soon outgrow even the largest pot, becoming starved and bedraggled after a couple of seasons. Some of the more vigorous hybrids will also run out of steam fairly quickly.
Clematis require a cool, moist root run, and growing one in a free-standing container inevitably opens the root system to the vagaries of the weather. In the summer the pot and its contents may become very hot and dry. In the winter, if it is not given some protection, the root system can be frozen solid. Both these extremes can result in the plant dying unless precautions are taken.
The choice of container is therefore an important issue. The most pleasing pots to look at are those made from traditional clay. These used to be regarded as expensive, but nowadays there are many imported types that are excellent value, even if they lack the true character of the traditional hand-thrown pot.
Clay pots are porous, and as the water seeps through the pores it evaporates, keeping the roots of the plants cool. However, this can also mean the pot is liable to cracking in frosty weather. If size prevents you from taking your garden pots and planters indoors for the winter, then it’s advisable to wrap some kind of insulation around them to protect both the pot and the roots from the cold.
Plastic is much more robust than clay, but as there is no evaporation the roots can become very hot. Plastic pots can also becomeunless there are plenty of holes at the base. If you bear these points in mind, however, your plants will grow very happily in plastic pots. They are also light, which means they can be moved around more easily.
The size of the container is important if your clematis is to thrive for any length of time. You are not recommended to use a pot any smaller than 18 in (50 cm) in diameter. This size will give the plant adequate room to grow and develop over a number of years, and will also hold sufficient water and nutrients to cope with its demands. Each year, when you prune the plant, you should carefully scrape off the top inch (2-3 cm) ofand replace it with some fresh compost. If you do this, your clematis will grow and provide an abundance of for many years.
The next important decision is the best compost to use. Remember that clematis like a good rich soil with lots of nutrients. A John Innes-type compost is always the best for this purpose. This formulation, developed many years ago, includes loam, which provides a good reservoir of nutrients and also retains adequate water without becoming too wet. Loam is also heavy, which helps prevent the container and its contents from blowing over in the wind.
Planting in a garden container is much the same as planting a clematis in the open ground. It’s a good idea to plant fairly deep so as to cover up some of the basal buds, and to firm it in gently around the roots with your clenched fists. Finish the process with a good watering, allowing any excess water to drain away.
Once your clematis has become established, start feeding it with a good, well-balanced liquid feed – preferably one that is high in potash. Feed it at least once a week during the growing season. If you give too much feed, then salts can build up in the compost. So it’s a good idea to miss one weekly feed each month, just watering normally to flush the compost through.
What to Grow in Garden Pots and Planters
All the varieties listed in the list below are suitable for growing in pots. However, some such as the alpinas and macropetalas have a short flowering period, so are probably not the best choice for free-standing displays in a conspicuous position.
Given a container of adequate size, you can also plant two varieties together such as Clematis ‘Comtesse de Bouchaud’ and C ‘Lady Northcliffe’, which will provide an eye-catching display of flowers over a long period. Low-growing annuals can also be planted to provide colour at the base, and a degree of shade for the clematis roots.
A selection offor growing in garden pots and planters:
Clematis alpina ‘Burford White’
C. a. ‘Columbine’
C. a. ‘Constance’
C. macropetala ‘Maidwell Hall’
C. m. ‘Markhams Pink’
C. m. ‘Orchid’
C. ‘Bees Jubilee’
C. ‘Comtesse de Bouchaud’
C. ‘Dr ruppel’
C. ‘Duchess of Edinburgh’
C. ‘Duchess of Sutherland’
C. ‘Lady Northcliffe’
C. ‘Mrs N. thompson’
C. ‘Mrs P.B. Truax’
C. ‘Wadas Primrose’