Raspberries are a popular fruit that are easy to grow and care for. They can be vigorous plants and regular pruning is essential to prevent the canes becoming overcrowded, which will gradually weaken them and reduce the size and quality of the crop.
How and when to prune your raspberries depends on whether you have a summer or autumn fruiting variety. Armed with that knowledge, and a sharp pair of secateurs, here’s everything you need to know to pune yours correctly.
|Summer fruiting varieties are easy to grow and maintain
Image: Raspberry 'Glen Ample' (summer fruiting) from T&M
Summer fruiting raspberries are best planted between early autumn and late spring and should be pruned straight after planting. Cut the canes down to about 2.5cm in height, which will allow them to develop strong shoots.
Summer fruiting raspberries crop on the previous year’s wood so newly planted canes won’t produce fruit until their second year. Once you’ve harvested the berries, all the stems that bore fruit should be removed. Cut all the old wood to the ground – it’ll be dark brown – leaving the new green shoots to develop and fruit the following year. Removing the old wood encourages healthy new shoots to grow from the base, reinvigorating the plant.
Once your plants are established, it may be necessary to thin out some of this young wood to prevent the canes from becoming too congested. About 20cm apart is the perfect distance. Growing just a few strong canes produces a better crop than cultivating a lot of spindly stems that don’t get enough light.
It’s also a good idea to remove any weak growth and ‘runners’ that appear in the wrong place. Hoe these out rather than cutting or digging, which can encourage more shoots.
And check your plants after winter - you may need to remove any frost-damaged tips.
|Prune autumn fruiting varieties of raspberry in spring
Image: Raspberry 'Polka' (autumn fruiting) from T&M
Autumn fruiting raspberry varieties flower and fruit in the same year, so they need to be pruned differently to summer raspberries.
Best planted over the winter when dormant, autumn fruiting raspberries should be pruned to the ground on planting. Once they have finished fruiting, you can cut all the canes down to the ground ready for new growth next spring.
If you live in a particularly cold part of the country, you might prefer to leave the canes alone after fruiting and wait until early spring. This prevents the risk of new growth being hit by frost. In spring, simply cut all the canes down to the ground to stimulate the new year’s growth, and remove any weak shoots.
The other benefit of spring pruning strong growing autumn varieties, is that it’s possible to get two different cropping times. Simply pruning a proportion of the canes to a height of 1m in early spring and the rest to the ground. Those that were pruned less severely will fruit in summer while the rest of the canes will produce raspberries as usual, in the autumn.
We hope this helps you to grow strong, healthy plants that produce bumper crops, year after year. For a quick recap, watch our video below.
Banner image: MP-Studio/ Shutterstock
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