North America Non-native Plant

Giant Filbert

Botanical name: Corylus maxima

USDA symbol: COMA18

Native status: Not native but doesn't reproduce and persist in the wild

Giant Filbert: A European Nut Tree for Your Garden Looking for a unique addition to your edible landscape? The giant filbert (Corylus maxima) might just be the conversation starter your garden needs. This European native brings both beauty and bounty to temperate gardens, though it’s worth considering native alternatives that ...

Giant Filbert: A European Nut Tree for Your Garden

Looking for a unique addition to your edible landscape? The giant filbert (Corylus maxima) might just be the conversation starter your garden needs. This European native brings both beauty and bounty to temperate gardens, though it’s worth considering native alternatives that support local ecosystems even better.

What Exactly is a Giant Filbert?

The giant filbert is a deciduous shrub or small tree that hails from southeastern Europe and southwestern Asia, particularly Turkey and the Balkan region. As its name suggests, this plant produces notably large hazelnuts – bigger than those from its more common cousin, the European hazelnut. It’s been cultivated for centuries for both its ornamental value and its delicious nuts.

Why You Might Want to Plant One

There are several compelling reasons to consider adding a giant filbert to your landscape:

  • Dual purpose beauty: You get lovely spring catkins, attractive heart-shaped leaves, and a harvest of large, flavorful nuts
  • Early pollinator support: Those dangling catkins appear in late winter or early spring, providing much-needed pollen when bees are just starting to become active
  • Manageable size: Typically grows 12-20 feet tall and wide, making it suitable for most residential properties
  • Cold hardy: Thrives in USDA zones 4-8, handling cold winters with ease
  • Edible landscaping: Perfect for those wanting to blend food production with ornamental gardening

The Growing Reality Check

Before you get too excited, here’s what you need to know about successfully growing giant filberts:

Cross-pollination is key: If you want nuts (and who doesn’t?), you’ll need at least two different varieties or a compatible pollinator nearby. Giant filberts aren’t self-fertile, so solo plants are purely ornamental.

Growing conditions: These trees prefer well-drained, fertile soil and perform best in full sun to partial shade. They’re not particularly fussy about soil pH but appreciate consistent moisture without being waterlogged.

Space considerations: While not massive, they do need room to spread. Plan for that 15-20 foot mature width when choosing your planting location.

Planting and Care Tips

Getting your giant filbert established is fairly straightforward:

  • Plant in early spring or fall when temperatures are moderate
  • Dig a hole twice as wide as the root ball but no deeper
  • Mulch around the base to retain moisture and suppress weeds
  • Water regularly the first year while roots establish
  • Prune during dormant season to maintain shape and remove dead wood
  • Be patient – nut production typically begins 3-5 years after planting

A Word About Native Alternatives

While giant filberts can be lovely additions to temperate gardens, consider native alternatives that provide similar benefits while supporting local wildlife more effectively. American hazelnuts (Corylus americana) offer many of the same advantages and are naturally adapted to North American conditions. Native alternatives typically require less maintenance and provide better habitat for local birds, insects, and other wildlife.

The Bottom Line

Giant filberts can be rewarding plants for gardeners interested in edible landscaping and willing to provide proper care. They’re not invasive or problematic, making them a reasonable choice for temperate gardens. Just remember that two plants are better than one if you want those prized large nuts, and consider exploring native options that might serve your landscape goals just as well while supporting local ecosystems.

Whether you choose giant filbert or a native alternative, you’ll be adding early spring beauty and wildlife value to your garden – and that’s always a win in our book!

Giant Filbert

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Hamamelididae

Order

Fagales

Family

Betulaceae Gray - Birch family

Genus

Corylus L. - hazelnut

Species

Corylus maxima Mill. - giant filbert

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA