Scientific: Xylosma congesta (Synonyms: Apactis japonica, Casearia subrhombea, Flacourtia chinensis, Myroxylon racemosum, Xylosma apactis)
Common: shiny xylosma
Family: Flacourtiaceae
Origin: Tropical America
Pronounciation: Zye-LOS-ma con-GES-a
Hardiness zones
Sunset 8-24
USDA 9-11
Landscape Use: Large foundation or background, semi-formal hedge, filler, small multiple-trunk tree, mesic landscape design themes.
Form & Character: Upright and rounded shrub, clean, bright and colorful in appearance, tropical.
Growth Habit: Semi-evergreen to evergreen, woody, broadleaf perennial shrub, moderate growth rate (slow for dwarf cultivar) to 5- to 25-feet tall with equal or greater spread.
Foliage/Texture: Glabrous, serrate, light green, ovate leaves tapering to an acuminate tip, new foliage reddish, bronze to copper, occasional stipular spines; medium texture.
Flowers & Fruits: Profuse, axillary, greenish yellow "pin cushion" flowers on older plants in October/November, rather subtle; fruits inconspicuous.
Seasonal Color: Reddened or bronzed new foliage......in other words not much.
Temperature: Hardy to 20oF, colder winter weather will induce deciduous habit.
Light: Full sun to nearly full shade. Eastern and northern exposures best in Phoenix.
Soil: Well-drained soil is desirable. This plant is salt sensitive and thus will invariably have leaf tip necrosis in Phoenix.
Watering: Regular, year around supplemental waterings are imperative in Phoenix.
Pruning: Prune for desired effect, shape or size....or leave informal and large. Shiny xylosma can be pruned severely to regenerate.
Propagation: Cuttings are difficult to root and root development of rooted cuttings as young nursery stock can be weak.
Disease and pests: Somewhat susceptible to Texas root rot.
Additional comments: Shiny xylosma is an 'old school', dependable, larger filler plant for large mesic landscapes. The dwarf cultivar 'Compacta' is one half the size and is preferred for smaller landscape spaces.
Historical Perspectives: Shiny xylosma is a landscape plant that was more common in Phoenix landscapes from 1940 to 1990, but has since faded away into obscurity with the advent of desert landscaping and the recent popularity of desert-adapted and desert-native plants. Frankly, in today's 21st century era of landscape sustainability shiny xylosma has become another one of those landscape 'period pieces'.