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Hybrid Oak

Quercus x warei 'Nadler' KINDRED SPIRIT Fagaceae

Growth habit

Tree

Perennation

Long-lived polycarpic perennial

Location

Houston and Grossman Ponds, Schnee Oak Collection

Source of plant

Horticultural Associates, Schmidt & Son Co.

Description

The distinct cultivar of a F1 hybrid oak tree, botanically known as Quercus robur fastigiata — Q. bicolor (Q.—warei) and referred to by the cultivar name 'Nadler'. The parent tree is growing in a cultivated area on the home grounds of inventor Earl Cully, 846 Hoagland Road, eight miles southeast of Jacksonville, Ill., in Morgan County, in Township 14, Range 10. 'Nadler' is the result of seed collected in the fall of 1974 from a tree of Quercus robur fastigiata (as determined by Dr. Gary Booth, Department of Horticulture, University of Missouri, Columbia, Mo.). All seedlings grown from seed collected from this one tree proved to be F1 hybrids (between the female parent Quercus robur fastigiata and the male parent Quercus bicolor). From an approximate one thousand seedlings, about sixty F1 hybrid seedlings were selected for further evaluation. Out of these sixty hybrid seedlings only two have proven to be worthy of cultivar status. The first to be introduced from this hybrid cross, was the cultivar named 'Long' Regal Prince®(U.S. Plant Pat. No. 12,673). 'Nadler' will be the second introduction. 'Nadler' is an extremely narrow-upright form that keeps a uniform width nearly to its top. It is very strong wooded with dark green leathery foliage that is highly resistant to powdery mildew. It is hardy in Zone 4. 'Nadler' has been successfully asexually propagated by chip budding onto Quercus bicolor. Bud take has been near 95% with no incompatibility between scion and rootstock. Buds set on two year rootstocks have produced six to eight feet of growth in one growing season. Asexually propagated trees of the 'Nadler' cultivar have maintained the unique characteristics which, in combination, distinguish this cultivar selection and from either of its parents.

USDA Hardiness Zone

4

Special characteristics

growth habit, disease resistance