Pruning Hazelnut
When and how — Corylus avellana
Prune your hazelnut in January and February — the optimal month is usually February.
The next pruning window is January next year.
When to prune?
The fruit hazelnut is pruned in January and February.
Pruning fruit is about balancing growth and yield.
Fruit trees and bush fruits live in an eternal balance between leaf production (vigour) and fruit (yield). Prune too little and you get a dense plant with masses of small, disease-prone fruit. Prune too much and the plant reacts with watershoots and almost no fruit. The right line: once a year in winter dormancy (January–February) shape an open crown so light and air can reach every branch. With apple and pear, learn the difference between fruit spurs (short, 2–3-year-old wood — that's where the flowers come from) and wood buds (long whippy growth). Bush fruits need a different approach: redcurrant and gooseberry are pruned to an open goblet shape; blackcurrant needs renewal pruning where you remove one-third of the oldest stems at ground level each year.
How to prune hazelnut
Hazelnut requires minimal pruning but benefits from regular attention to maintain an open, productive framework. Prune in January or February while the plant is fully dormant and before the catkins begin to shed pollen. Avoid pruning in late winter or spring once sap is rising, as this can lead to excessive bleeding and weaken the plant. The aim is to create a goblet-shaped bush with 6–10 strong main stems arising from the base. In the first few years after planting, remove any weak, crossing, or inward-growing shoots to establish a clear structure. Once the plant matures, focus on thinning out older wood: hazelnut produces the best nuts on younger stems, so every few years cut one or two of the oldest, thickest stems right down to ground level to encourage vigorous new growth from the base. This renewal pruning keeps the shrub productive and prevents it becoming congested. Remove any suckers that appear away from the main clump, as these can spread and turn your hazelnut into a thicket. Also take out any dead, damaged, or diseased wood whenever you spot it. Use sharp bypass secateurs for thinner stems and a pruning saw for anything thicker than your thumb. If your hazelnut has become overgrown or neglected, you can renovate it by cutting all stems down to 30–50 cm above ground level in late winter; it will regenerate vigorously, though you'll lose a couple of years' cropping.
Common mistakes
✗ Finally pruning after five years of neglect
A drastic prune after years of nothing triggers an explosion of watershoots and almost no fruit the next year. Better to gradually restore over 2–3 years than do everything in one winter.
✗ Pruning blackcurrant the way you prune redcurrant
Blackcurrant fruits on one-year-old wood, redcurrant on short, multi-year spurs. Prune a blackcurrant for shape (like redcurrant) and you'll harvest nothing.
✗ Pruning during frost
Wounds don't heal in frost and the wood can split. Wait for a frost-free day, even in winter dormancy.
Too late this year? Here's what to do
Better to wait than prune at the wrong moment. The next optimal window is January next year. Until then: leave the plant alone — only remove dead or diseased wood (which you can do year-round).
