When choosing a suitable tree for your garden, it makes sense to consider those offering more than one attraction. This is particularly important in small gardens, where space is limited. Fortunately, Turkish Hazelnut trees, Corylus colurna, offer a combination of ornamental features such as foliage, impressive autumn color and winter bark. This tree species is easily recognized by its conical crown, even in old age, and its rugged gray bark in winter. Pendant catskins are borne in late winter, followed by large, heart-shaped leaves that turn yellow in autumn They work best in full sun and have moderate growth. Their mature size is 60 ft tall by 20-30 ft wide. They work best in zone 5.