Corylus avellana

Features and care

The common hazel (Corylus avellana) is a large shrub or small deciduous tree with a broad, highly branched habit, typically producing several stems from the base. It can reach 3 to 6 meters in height, although it can grow taller under favorable conditions, forming a dense, rounded crown. Its leaves are large, rough, rounded or oval, and doubly toothed, turning medium green during the growing season and golden yellow before falling in autumn. It is a suitable species for orchards, informal hedges, naturalized gardens, and fruit plantations.

In late winter and early spring, it produces hanging yellow male catkins, while the female flowers are very small and recognizable by their reddish styles. After pollination, the hazelnuts develop in clusters, protected by a green husk, and ripen between late summer and autumn. Although it may produce some fruit individually, for more abundant harvests it is advisable to plant at least two compatible varieties, as pollination is primarily wind-borne.

At Ornacom we cultivate each specimen directly, guaranteeing a balanced size and abundant flowering from the first years of planting.

Extended species profile

Verified cultivation data, designed so that any visitor can understand at a glance whether the plant is suitable for their climate and garden.

Crop

Exposure

Full sun or partial shade

Irrigation

ORN-WATERING 4/5 · high — maintain uniform moisture, increasing in heat; without saturation

Soil / moisture

Fresh to moist; well-drained

Bloom

Summer

Climate

USDA Hardiness

4–8

Compatible climates

Cfb, Cfa, Dfb, Csb

Tolerance to humid climate

ORN-HUM 4/5 · high

Maintenance

Development

ORN-ALT 4/5 · 3–6 m · medium growth

Pests

ORN-PLAGA 3/5 · medium — check for sucking insects, mites, and rot depending on climate and drainage

Pass

ORN-ABONO 4/5 · high — fruit program according to soil/leaf analysis; split N and reinforce K without exceeding

  • Warning

Fruiting requires compatible pollinating cultivars; avoid extreme heat/dryness.

Extended species profile

Verified cultivation data, designed so that any visitor can understand at a glance whether the plant is suitable for their climate and garden.

Crop

Exposure

Full sun

Irrigation

ORN-WATERING 4/5 · high — maintain uniform moisture, increasing in heat; without saturation

Soil / moisture

Fresh to moist; well-drained

Bloom

Summer

Climate

USDA Hardiness

10–11

Compatible climates

Warm Cfa, Cwa, Subtropical Af/Am

Tolerance to humid climate

ORN-HUM 5/5 · very high

Maintenance

Development

ORN-ALT 4/5 · 2–5 m · slow to medium growth

Pests

ORN-PLAGA 5/5 · very high — leafminer, aphids, mealybugs, mites, whitefly and Phytophthora; mandatory phytosanitary control

Pass

ORN-ABONO 5/5 · very high — fractionated citrus nutrition from spring to late summer, with Fe, Mg, Mn and Zn according to analysis

  • Warning

Update the genus; sensitive to frost, dry sun, and wind. Requires phytosanitary monitoring of citrus.

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