Raspberries after harvest: prune now for strong new canes

By mid-July, most summer raspberries hold just a few last berries – the rows look tired and crowded. This is exactly the moment when a few well-placed cuts set the course for next year’s berry season. Here’s which canes to remove, which to keep, and what to do afterwards.

Why right after harvest is the best moment to prune

Summer-bearing raspberries fruit on canes that grew the previous year. Once harvest is over, those spent canes have done their job – they’ll die back over the course of the year anyway. Until then, though, they steal light, air and water from the young shoots.

Pruning right after harvest gives the new canes room to grow. It also noticeably lowers disease pressure: fungal diseases like cane blight prefer to overwinter on old wood. The sooner it’s out of the row, the healthier your patch starts into next season.

Summer or autumn raspberry? Check first, then prune

Timing depends on the type. Summer-bearing raspberries fruit in June and July on last year’s canes – for these, you now remove only the canes that have fruited. Autumn-bearing raspberries crop from August to October on this year’s shoots. They get cut back completely, close to the ground, only after the season – traditionally in late winter.

Not sure which type you have? Look at when it fruits: if you picked mainly in June and July, it’s a summer bearer. If the main crop only ripens from August onwards, you have an autumn variety – in that case, leave the pruners in the shed for now.

How to prune, step by step

Spent canes are easy to spot: they’re brownish, woody and still carry the remains of the fruit clusters. Young canes are green, flexible and free of fruited side shoots. Cut all spent canes off close to the ground – no stubs, since stubs are entry points for fungi.

Then thin out the young canes: keep around eight to twelve strong shoots per metre of row and remove thin, weak ones. Tie the remaining canes loosely to your trellis or wire. That way every leaf gets light and the row stays airy.

After pruning: water, mulch and a light feed

The remaining young canes are now building the wood you’ll harvest from next summer. Keep the soil evenly moist during dry July spells – raspberries are shallow-rooted and sensitive to drought. A mulch layer of grass clippings or leaves locks moisture into the soil and keeps the roots cool.

A thin layer of compost around the row is all the summer feeding they need. Skip nitrogen-heavy fertiliser from now on: the canes should ripen and harden off by autumn, not head into winter soft.

Three mistakes that cost you next year’s harvest

The most common mistake: cutting down every cane. On summer bearers, that removes exactly the shoots that would fruit next year – and your harvest is gone. Second classic: leaving the row too crowded. In dense stands the foliage dries off poorly, giving fungal diseases and grey mould an easy time.

And third: pruning too late. If the old wood stays until winter, you waste weeks in which the young canes could be soaking up light and energy. Right after harvest, the effort is smallest and the payoff biggest.

Keep a record of what you pruned

Especially with several rows of berries, it pays to briefly document your pruning: which row was done when, how many young canes are standing, where disease pressure was highest? Rootivo’s garden journal lets you record it with date, note and photo – so next summer you’ll know exactly how each row was cared for.

Im Lexikon: Himbeere