Feature Tree

Turkish Filbert 

Common Name: Turkish Filbert

Scientific Name: Corylus colurna

Family:  Betulaceae

This Tree in Colorado: These trees deal well with temperature extremes (zone 4), snowstorms and windstorms. Both the form and leaf shape closely resemble that of a littleleaf linden and therefore this tree makes an excellent substitute when a formal, medium sized, pyramidal tree is desired. Boulder has a nice row of established Turkish filberts and the current state champion (14” DBH). Their forestry staff plants several additional trees each year and has been impressed at how it has performed as a street tree.

Growth Rate, Form and Size: Has a densely pyramidal form when younger, very similar to that of a littleleaf linden. It is pyramidal-oval to almost round at maturity. Considered a medium sized shade tree, the mature size is approximately 40-50 feet in height with a 20-30 foot spread.

Landscape Value:  The tree is somewhat difficult to transplant and must receive supplemental watering for the first few summers. Once established it is quite drought tolerant. It is able to withstand somewhat alkaline soils but doesn’t like heavy clay soils that remain saturated.

Fruit:  The filbert nuts develop inside an unusual bract that is actually a modified leaf. 

Foliage:  The attractive dark green summer foliage resembles that of a linden from a distance. The fall color is usually just a yellow-brown but a nice yellow color occurs periodically.

Bark:  The bark becomes flaky with age and as scales fall off a brown or orange-brown bark is exposed.

            Insects and Disease: The tree seems to be free from insect or disease problems. Even the aphids tend to feed elsewhere. When other species such as maples and lindens display scorch symptoms, the Turkish filberts remain green and vigorous.