How to prune hazel (Corylus): complete pruning guide

Why prune hazel?

Hazel (Corylus avellana) grows naturally as an untidy shrub. Without pruning your tree quickly becomes a wilderness of spindly young shoots with more disease and fewer nuts. With regular pruning you keep it compact, productive and healthy. Also hazel suddenly throws many long thin branches that need support - pruning helps here too.

Hazel responds well to pruning. It is actually a tree for pruners who like to stay busy. With some attention you get a nice shape and plenty of nuts every year.

Year 1: Forming the main trunks

You plant a young hazel in October. Let it simply grow in year one. In October of year two you assess what you have.

Hazel naturally grows with multiple trunks (not a single one). This is fine. Choose the three to five strongest trunks distributed evenly around the plant. These become your primary trunks. Everything else (thin side shoots, weak shoots near ground) you remove entirely.

You do not cut these primary trunks hard in year two - you let them grow. Their job is building height.

Years 2-3: Forming side branches

Now that your primary trunks are in place, they form side shoots in year two. This is careful work. On each trunk choose two to three strongest side shoots that spread evenly. These become your secondary branches. You cut them carefully to roughly 20-30 cm length.

Remove all other side shoots. This becomes your open "cup" shape - the trunk goes straight up, with side shoots spreading evenly outward.

Annual maintenance (year 3+)

After year three pruning is mostly maintenance. Your goals are:

1. Keep the open shape: Every winter (January-February) remove all branches growing into the middle. This keeps your tree "hollow" so light enters and diseases establish less easily.

2. Remove young shoots: Hazel produces many long thin shoots each year that go nowhere. Remove these without hesitation. They add nothing.

3. Replace old branches: Every three to four years cut out one of your primary trunks entirely. A strong young replacement grows to replace it. This keeps your tree young and vigorous.

4. Control height: Hazels want to grow upward. If your tree grows larger than you want, carefully cut the primary trunks back to your desired height.

Pruning by topology

This is important for hazel: you always cut just above a side shoot or bud pointing outward. This encourages outward growth rather than inward. Never cut against a bud, but always at a slant, 5mm above the bud.

Hazel catkins and flowering

Hazels form their flowers in autumn. Those small brown "catkins" you see in October are male flowers. The female flowers form in those same catkins but are very small. They appear around February-March when it warms.

This is critical: NEVER cut away your catkins in October! Those are your nuts next year. Many careless gardeners do exactly this. Bad mistake.

Hazel suckering - should you?

Hazels are notorious "root suckerers." They form new shoots from the ground around the mother plant. Many gardeners let these grow - it gives a thicket appearance. But this makes the plant wild and uncontrolled.

Decision: if you want a neat tree, remove all suckers. Cut them flush to ground. If you want a denser shrublet, let them grow and treat your plant as a shrub (see below).

Hazel as twig source

Many gardeners grow hazel just for the pruning twigs (the long branches for decoration). This requires different pruning: you let branches grow three years without cutting, then harvest them all. It works, but you get then no nuts.

Decision: if you want nuts, follow normal pruning. If you want twigs, accept that you get no/few nuts.

Frequently asked questions

Why do my hazelnuts grow so small?

Hazels must be pollinated (usually by wind). You need two different varieties for cross-pollination. Also: young trees (years 1-3) sometimes bear little. Patience until years 4-5.

Also: if you maintain your tree poorly (lots of weeds, dry ground), nuts become small. Ensure nutrition and water.

Can I cut hazel hard?

Yes, hazel tolerates hard pruning well. Even if your tree is neglected and chaotic, you can cut it hard in February (back to 50cm height). It comes back stronger.

What if my hazel gives rotten nuts?

This is disease problem (sometimes hazel fungus). Ensure good air circulation (prune open shape). Add nutrition (compost). Some cultivars are disease-tolerant.

How old can hazel become?

50-60 years is not unusual. This plant requires some patience but rewards you every year.

Step-by-step

Step 1: Years 1-2 - choose primary trunks

Let hazel grow. In October year two choose three-five strongest trunks. Everything else away.

Step 2: Years 2-3 - form side branches

On each trunk choose two-three side shoots. Carefully cut them back to 20-30cm.

Step 3: Year 3+ - annual maintenance

Every winter remove everything from the middle. Remove long thin shoots. Remove root suckers.

Step 4: Every 4 years - replace old trunk

Cut out one primary trunk entirely. A young replacement grows.

Step 5: Protect flowering

NEVER cut catkins away in October. Those are your nuts.

Cultivars that perform well

Segorbe, Negra de Madrid: Large hazelnuts, good producer. Perfect for front garden.

Tonda Gentile: Large, fine nuts, Italian cultivar. Protected designation of origin hazelnut.

Ennis: Self-fertile (unusual!), good productive. Easier without a second plant.

Hazel in front yard?

Hazel is perfect for front yard. Stays compact, beautiful foliage, lovely catkins in autumn/winter. The hazelnuts are a bonus. Just know in advance: do you want nuts (then another cultivar for cross-pollination) or mainly a beautiful plant?

Discover your own garden design

At [gardenworld.app](https://gardenworld.app) you can upload your front yard and see how hazel fits - with realistic growth shapes and surrounding plantings. Plan your garden before you plant.