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Hazelnut
A tough, cold-hardy nut BUSH (not a big tree) that fits real gardens - but it blooms in midwinter and is self-incompatible, so you must plant two varieties, and in eastern North America the whole game is choosing blight-resistant types.
Safety notes The kernel is the food and is a common tree-nut allergen (hazelnut allergy can be serious). No toxic parts - hazelnuts are among the friendliest nut plants, and the bushes are also valued as wildlife hedgerow.
Overview
The hazelnut (or filbert) is the most garden-friendly nut plant there is: instead of a 60-foot tree, it grows as a multi-stemmed shrub or small tree just 8-15 feet tall, cold-hardy well into the North, quick to bear (often 3-5 years), and doubling as a handsome hedgerow and wildlife plant. It's the nut you can actually fit in a backyard.
Quick facts
- Winter chill
- 1000 hours below 45°FRange: 800–1200 hours
- Height
- 15 ftRange: 8–20 ft
- Spread
- 12.5 ftRange: 8–20 ft
- Cold
- Takes hard frostdamaged below -20°F
- Heat
- Struggles above 95°F
- Life cycle
- Perennial, lives about 40 years
- Soil
- Well-drained
- Water
- Medium
- Plant spacing
- 15 ftRange: 10–20 ft
When to plant
Fall transplanting is open for 28 more days. Next: winter, Jan 15 to Mar 15.
- Transplant Oct 1 – Nov 16 Open now · 28 days leftFall planting lets roots establish before the winter bloom and spring growth. The blight-resistant OSU European varieties (Yamhill, Jefferson, Theta) suit this range.
- Transplant Jan 15 – Mar 15 Opens in 88 daysThe Pacific Northwest heartland of European hazelnut growing (mild, moist). Plant dormant in late winter. In the humid East at this latitude, choose blight-resistant American/hybrid types over European Barcelona.
Frost here: last around Apr 10 (Mar 27 to Apr 24 most years), first around Oct 25. Zone averages, your own yard may run a week or two either way.
Life stages
Establish, grow, repeat
Getting established and returning each season are different parts of the story.
Stage 1 of 5 · Getting established
First-year establishment
The first year after planting
Care at this stage
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Water regularly the first two seasons
Keep newly planted hazelnuts evenly moist through their first summers to build the shallow, fibrous root system. They have no taproot, so they transplant more easily than most nut trees but still need consistent early water.
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Mulch a ring, kept off the stems
A wood-chip ring conserves moisture and suppresses grass. Keep it off the base to prevent rot and to make it easy to see and manage the suckers.
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Guard young stems from rodents and deer
Rabbits, voles, and deer browse young hazelnut stems. A cage or guard protects the multi-stem bush while it establishes.
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Decide bush vs. tree form early
Hazelnuts naturally sucker into a multi-stem bush (easiest and most productive for home growers). If you want a single-trunk tree, remove suckers as they appear from the start; for a bush, let a handful of strong stems develop.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Harvest
- Nuts turn from green to brown and begin falling from their husks
- The leafy husks dry and brown, and nuts drop freely or with a shake
- The kernel in a test nut is plump, tan, and fully filled
- Nuts are collecting on the ground under the bush in late summer
- Gather nuts as they drop, or when husks brown · every 2 days
- Husk and dry the nuts
Per plant 500 to 5000 nuts, 5 to 50 lbPicking pick as they ripen
Cook with hazelnuts
Watch out for
4 to know. 2 are high-risk: Squirrels & Rodents, Eastern Filbert Blight. 1 is active in October.
Squirrels & RodentsSeverity High WildlifenowSeason: Aug–OctChewed husks, shells or hulls scattered under the plant, fruit and nuts vanishing as they ripen, and gnawed or half-eaten windfalls.
Because hazelnut bushes are low and accessible, squirrels reach the whole crop easily and can strip a bush bare in days. Gathering daily as nuts ripen and drop, or picking nearly-ripe husks by hand to finish indoors, is the only real defense. Chipmunks and jays take their share too.
Chewed husks, shells or hulls scattered under the plant, fruit and nuts vanishing as they ripen, and gnawed or half-eaten windfalls. On new plantings: freshly dug holes and scattered soil, bulbs missing or gnawed, dug-up seed rows, vole runways under the mulch, and gaps in spring where you know you planted.
There is no rescue for what has already been eaten, so this is a prevention problem. Re-cover disturbed plantings with mesh promptly, replant losses inside cages, and trap or exclude persistent diggers where that is legal locally. On a large tree, accept that you will share the crop and concentrate on gathering promptly.
For a crop on the plant, timely and frequent harvest is the real defense - gather daily through the ripening window rather than leaving anything to hang, and pick slightly early to finish indoors where the crop allows it. Net or bag what you can reach. For bulbs and sown seed, lay wire mesh or hardware cloth over the planting, plant deeper, use buried wire baskets, and clear away the papery tunics and debris that advertise a fresh planting. Trunk baffles slow climbers on isolated trees, clearing jumping routes from nearby trees and roofs helps, and removing brush cover reduces the rodents sheltering nearby.
Squirrels, chipmunks, voles and mice are the wildlife that competes with you most directly for a crop. They take ripening nuts, seed and fruit off the plant, usually before you judge it ready, and cache what they do not eat. They also dig up freshly planted bulbs and sown seed, and voles tunnel in to gnaw bulbs and roots underground through winter. They climb anything, they know exactly when a crop is ripe, and a determined pair can clear a small tree or a new planting in a few days.
Eastern Filbert BlightSeverity High DiseaseSeason: Mar–JulRows of raised, black, football-shaped bumps running along the branches (often on last year's wood), dieback of the stems above them, and gradual decline of susceptible varieties.
This disease shapes ALL hazelnut variety choice in North America - it's why Barcelona is being abandoned and why resistant breeding matters so much. Native American hazelnut is naturally resistant. Single-gene (Gasaway) resistance is not permanent: eastern isolates have overcome it, so 'resistant' means something different in Oregon than in New Jersey.
Rows of raised, black, football-shaped bumps running along the branches (often on last year's wood), dieback of the stems above them, and gradual decline of susceptible varieties.
On susceptible plants, cut out infected wood a foot or more below each canker and destroy it; fungicide programs slow it in orchards but home control relies on resistance and sanitation. Badly infected susceptible plants are best replaced with resistant ones.
The overwhelming best defense is planting RESISTANT varieties (OSU releases Yamhill, Jefferson, Theta; native American and hybrid hazelnuts). In the eastern US, note that those three OSU releases all carry the same single Gasaway resistance gene and that eastern isolates have been shown to overcome it, so prefer multi-gene-resistant Rutgers releases or American/hybrid stock there. Prune out cankers well below the visible bumps and destroy the wood; improve airflow.
The defining hazelnut disease of North America: a native fungus (Anisogramma anomala) harmless to wild American hazelnuts but lethal to susceptible European varieties, forming distinctive rows of raised black, football-shaped bumps (stromata) along the stems, girdling and killing branches over a few years until the whole plant dies.
FilbertwormSeverity Medium PestSeason: Jul–SepSmall entry holes and frass on the husk or shell, wormy kernels when you crack damaged nuts, and early drop of infested nuts.
The hazelnut-specific nut borer; sanitation (removing dropped nuts) is the key control.
Small entry holes and frass on the husk or shell, wormy kernels when you crack damaged nuts, and early drop of infested nuts.
Sanitation is the main home control; well-timed sprays (spinosad) target egg hatch in high-pressure orchards. On a home bush, prompt harvest and cleanup usually suffice.
Harvest promptly and clean up all dropped nuts (infested and sound) to break the life cycle, since larvae overwinter in ground litter; pheromone traps help monitor moth flights.
The filbertworm (Cydia latiferreana, a close relative of the codling moth) is the main insect pest of hazelnuts: the moth lays eggs and its larvae bore into developing nuts, feeding on the kernel and leaving frass, ruining infested nuts.
AphidsSeverity Low PestSeason: Apr–JunDense clusters of tiny insects packed onto shoot tips, flower buds, and the undersides of young leaves.
The filbert aphid is the species here, clustering pale on new shoots; heavy infestations can dull vigor and nut fill. Usually a minor spring issue that beneficial insects handle on an established hazelnut.
Dense clusters of tiny insects packed onto shoot tips, flower buds, and the undersides of young leaves. Curled, cupped, or distorted new growth that never opens properly. A sticky shine on the leaves - and on whatever sits under the plant - that later goes black with sooty mold. Tiny white cast skins left behind where a colony has been feeding. Ants running steadily up and down the stems, which is often the first thing you notice. Mottled, streaked, or misshapen leaves that do not grow out can mean a virus the aphids brought with them rather than the feeding itself.
Knock the colonies off with a hard jet of water and repeat every few days - on most plants that alone ends it. Pinch out or prune off the worst-infested tips rather than treating the whole plant. If colonies keep rebuilding, spray insecticidal soap or horticultural oil directly onto the insects, covering leaf undersides, and repeat weekly until they are gone; treat early or late in the day, and never spray a wilted or heat-stressed plant. Avoid broad-spectrum insecticides - they kill the ladybugs, lacewings, and parasitic wasps that were about to solve the problem for you, and aphid numbers usually come back worse afterward. Anything you spray must be labeled for the plant you are treating; follow that label and observe its pre-harvest interval. On anything you eat, wash leaves, heads, and buds well before use, since aphids hide down in crowns, folds, and tight growth.
Go easy on nitrogen: the soft, lush growth that heavy feeding produces is exactly what aphids breed on. Check new growth once a week through spring and early summer so you catch colonies while they are still small, and rub the first few out with your fingers. Leave flowering plants nearby and skip broad-spectrum sprays - ladybugs, lacewings, hoverflies, and parasitic wasps do most of this work for free, and they only stay if there is something for them to eat. Keep ants off the plant where you can, since they protect aphids from those predators. Water steadily so plants are not stressed, and check any new plant over before you bring it home or move it indoors, since aphids usually arrive on something else.
Aphids are small soft-bodied sap-suckers - green, black, gray, pink, or waxy white, and mostly wingless - that gather in dense colonies on the tenderest new growth: shoot tips, buds, and the undersides of young leaves. They breed extremely fast in mild weather, so a few can become hundreds inside a week. Their feeding curls and distorts soft growth, and the sticky honeydew they excrete coats everything below and turns black with sooty mold. Ants often farm and defend the colonies for that honeydew. A few aphids are normal on almost any plant and a healthy plant shrugs them off; only dense, persistent colonies do real damage, and some aphids also spread plant viruses as they feed.
Good & bad neighbors
Plant nearby
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A clover understory fixes nitrogen, suppresses grass, and feeds pollinators - a good living groundcover under a hazelnut bush or hedgerow (though hazelnuts are wind-pollinated, the beneficial insects still help).
- Traditional pairings, thin evidence
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ComfreyA classic nut-guild plant: deep roots mine minerals and the chopped leaves make a nutrient mulch. Traditional, low evidence, but harmless and useful under a bush.
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Shade-tolerant currants and gooseberries interplant well in the partial shade of a hazelnut hedgerow, sharing similar cool-climate, moist conditions - a productive layered planting.
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Planted around the base, daffodils deter voles and rabbits from gnawing the young stems and bloom early; a harmless, useful ring under a young hazelnut.
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Brambles can share a hedgerow edge with hazelnuts in edible landscapes; keep them from crowding the bush, but they coexist and share cool, moist conditions.
Varieties · 5
You pick one when you add Hazelnut to your garden. Its days to maturity set your harvest window.
Yamhill
An OSU release with very high resistance to eastern filbert blight - the breakthrough that lets you grow European-quality hazelnuts in blight country.
Variety details for Yamhill
Compact bush with round, medium, good-quality kernels.
europeanblight-resistantcompacthigh-yieldResists Eastern filbert blight (highly - single Gasaway gene)
Compact, productive, early-bearing, with good-sized round kernels well suited to the kernel market. Note that its resistance rests on the single 'Gasaway' gene, and eastern US strains of the blight have been shown to overcome that gene, so it is a far safer bet in the Pacific Northwest than in the East. Plant with a compatible pollinizer.
Jefferson
The flagship OSU blight-resistant variety: large, high-quality, in-shell-grade nuts on a productive tree, with strong resistance to both eastern filbert blight and big bud mite.
Variety details for Jefferson
Upright tree with large, round, attractive in-shell nuts.
europeanblight-resistantlarge-nuthigh-qualityResists Eastern filbert blight (highly - single Gasaway gene), Big bud mite (high resistance)
Widely planted commercially and an excellent home choice in the Pacific Northwest. Its blight resistance is the same single 'Gasaway' gene the other OSU releases carry, and Rutgers has documented Jefferson becoming infected by eastern blight strains in New Jersey plantings - so treat it as a Northwest variety rather than an eastern one. Needs a compatible pollinizer - Theta is the classic partner.
Theta
A blight-resistant OSU variety valued both for good kernels and as the go-to pollinizer for Jefferson, with which its winter bloom overlaps well.
Variety details for Theta
Round kernels of good quality on a resistant tree.
europeanblight-resistantpollinizerosu-releaseResists Eastern filbert blight ( - single Gasaway gene)
Productive and disease-resistant - a reliable partner variety that also carries a crop of its own. Like Yamhill and Jefferson it carries the single 'Gasaway' resistance gene, which eastern US blight strains can overcome, so it is most dependable in the Pacific Northwest.
Barcelona
The historic commercial standard of the Pacific Northwest - large, round, high-quality nuts and heavy yields - but highly SUSCEPTIBLE to eastern filbert blight, which is why it's being replaced by resistant varieties and is a poor choice in blight country (the East and increasingly the Northwest).
Variety details for Barcelona
Large, round, high-quality nuts on a vigorous, spreading tree.
europeanlarge-nutclassicblight-susceptibleGrow only where blight pressure is low and you can manage it.
Hybrid Hazelnut (American x European)
American-European hybrids (from breeders like Badgersett and university programs) aim to combine the American hazelnut's blight resistance and hardiness with the European's larger, better nuts - vigorous, adaptable bushes popular in permaculture and cold-climate nut plantings.
Variety details for Hybrid Hazelnut (American x European)
Vigorous hybrid bushes with medium nuts, better than pure American types.
hybridblight-resistantcold-hardyvigorousResists Eastern filbert blight, Cold (very good)
Often sold as seedling swarms; plant several for genetic diversity and pollination.
Grower tips
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