WARNING: LOCALLY INVASIVE SPECIES
Common Name: alder buckthorn
Type: Deciduous shrub
Zone: 3 to 7
Height: 5.00 to 7.00 feet
Spread: 1.50 to 2.00 feet
Bloom Time: May
Bloom Description: Creamy white
Sun: Full sun to part shade
Suggested Use: Hedge
Easily grown in average, medium moisture, well-drained soils in full sun to part shade. Prefers consistent moisture. Adapts to a variety of soils. Plants will not self-seed in the landscape.
FINE LINE is an upright, columnar, freely branching, deciduous, alder buckthorn cultivar with fern-like foliage, few flowers and nonviable seed. It grows slowly to 5-7’ tall but to only 2’ wide. It acquires its columnar shape from its seed parent (R. frangula ‘Columnaris’) and its fern-like foliage from its pollen parent (R. frangula ‘Aspleniifolia’). Linear, undulate, deeply cut, feathery foliage is medium green, but turns yellow in fall. Small inconspicuous flowers (1/6” diameter) appear in clusters in May-June, but flowering is often sparse. Seed development is unusual, with the few seeds that are produced being non-viable. Species plants (R. frangula) have limited value in the landscape in large part because they are weedy and self-seed. In contrast, FINE LINE is neither weedy nor invasive, but is valued as a restrained and versatile columnar accent. ‘Ron Williams’ is the cultivar name, but plants are now primarily being sold under the trademark name of FINE LINE. U. S. Plant Patent PP14,791 issued May 18, 2004.
No serious insect or disease problems. Japanese beetles, caterpillars and scale may appear. Cankers, leaf spots and rust.
Excellent accent for small/narrow areas of the landscape. Foundations. Borders. Backdrop for perennial plantings. Hedge. Privacy screen. Containers.