Pruning Raspberry Canes for Better Yields

Why Pruning Raspberries Is the Difference Between a Meh Crop and a Glut

Raspberries are generous plants, but they reward a firm hand. The single biggest mistake gardeners make is pruning at the wrong time. Summer-fruiting raspberries carry their crop on canes that grew the previous year. Autumn-fruiting raspberries fruit on canes that grow in the same season. Cut the wrong canes and you lose a whole year's harvest. Cut the right ones and you'll be picking bowlfuls from midsummer right through to the first frosts.

Good pruning also lets light and air into the row, which reduces fungal disease, makes picking easier, and encourages larger, sweeter berries. It's one of those jobs that feels brutal the first time and satisfying ever after.

Summer-Fruiting Raspberries: Prune Straight After Harvest

For summer varieties — 'Glen Ample', 'Malling Jewel' and the like — the rule is simple: cut out the canes that have just fruited, and keep the new ones. Do this as soon as you've picked the last berry, usually late July or August.

The fruited canes, called floricanes, are easy to spot. They are brown or greyish, woody, and carry the dried-up remains of fruit spurs. Cut them right down to ground level. Don't leave stubs — they make a handy entry point for disease. The new canes, or primocanes, are green and smooth. These are next year's fruiters, so leave them alone.

Once the old canes are gone, thin the new ones. Aim for about 10–15 cm between canes, or roughly 8–10 canes per metre of row. Remove any that are spindly, damaged, or growing in the wrong direction. Tie the strongest to your support. Then, in late winter, shorten the tips of these canes by about 15 cm. This encourages side shoots, and side shoots mean more berries.

Autumn-Fruiting Raspberries: Cut Everything Back in Late Winter

Autumn varieties — 'Autumn Bliss', 'Joan J', 'Polka' — fruit on new growth from late August onwards. They are the easiest raspberries to prune because there is almost nothing to think about. In late winter, around February, cut every cane to ground level. Yes, every single one. It feels drastic, but the plants will bounce back with fresh canes in spring, and those canes will carry the autumn crop.

If you want to stretch the season, try the "half-and-half" trick. Cut half the canes to the ground in February as normal. Leave the other half unpruned. Those older canes will fruit a little earlier in summer, giving you a few weeks of extra picking. Cut them to the ground after they finish. It's a handy method for a small garden, though not essential.

After cutting, thin the new spring shoots to about 10–15 cm apart. Or, if you have room, let them form a loose thicket. Feed with a balanced fertiliser in March and water well during dry spells when the berries are swelling.

Cedar Supports and Garden Craft: Practical and Beautiful

Raspberries need support. A simple row of cedar posts at each end, with two or three horizontal wires stretched between, is ideal. Cedar is naturally rot-resistant, so it lasts for years without chemical treatment. It also looks warm and handsome against green foliage, and it smells wonderful while you work.

For a small patch, a cedar obelisk or a trio of cedar canes tied into a teepee works a treat. Offcuts from a cedar project can become plant ties, row markers, or a light frame for bird netting. A cedar bark mulch around the base of your canes will suppress weeds and hold moisture, though keep it a few centimetres away from the stems to avoid collar rot. That is the essence of cedar garden craft: using a durable, beautiful material to make the practical jobs — supporting, labelling, protecting — a pleasure rather than a chore.

Common Pruning Mistakes and Aftercare for Better Yields

Even experienced growers slip up now and then. Here are the pitfalls to avoid:

• Pruning at the wrong time. Summer types need post-harvest pruning; autumn types need late-winter pruning. Get this back to front and you'll cut off your crop.
• Leaving stubs. Always cut flush to the ground. Stubs die back and invite cane blight.
• Skipping the thinning. A crowded row is a diseased row. Thin new canes to improve airflow.
• Pruning wet canes. Fungal spores spread easily on wet secateurs. Wait for a dry day.
• Forgetting to feed. Raspberries are hungry plants. Mulch with well-rotted manure or compost in late winter, and apply a general fertiliser in spring.
• Leaving fallen leaves and canes. Clear debris to reduce the risk of spur blight and cane blight. Burn diseased material — don't compost it.

Finally, keep your secateurs sharp and clean. A clean cut heals faster than a bruised one. If you've had disease in the row, wipe your blades with a garden disinfectant between plants. With the right pruning and a little cedar craft to hold everything tidy, your raspberry patch will reward you with heavier crops and healthier canes year after year.