Rosa cv.

Rosaceae (Rose Family)

▲▼  mature landscape rose

▲▼ flowers

▲▼'Knockout' Rose in landscape on east side of Karls Hall, MSU campus

▲▼ flowers of 'Knockout' rose

Location on campus: in garden area on east side of Karls Hall; many other locations on campus

Rosa spp. and cv.: Rose

·         very large genus with many species and many cultivars of a number of the species

·         leaves usually deciduous (some semi-evergreen), alternate, pinnately compound with usually 5 leaflets; usually dark green to reddish green in color; leaves may be glabrous and shiny or rough-textured (rugose) and slighly pubescent

·         stems usually green at first, turning yellow or brown with age, with 1/4" thorns covering stems slightly or very thickly

·         flowers can be single with few petals or double with near 100 petals, often showy, some very fragrant; peak of bloom is usually mid to late spring, but some bloom off and on all summer through fall, usually with heavier blooming again in early fall

·         vary variable in growth habit, from shrub-like to groundcovers to “climbers” with long, lanky stems that can be trained on a trellis

·         prefer full sun (for best flowering) and well-drained soils with high organic matter; cannot tolerate wet soils

·         some very prone to diseases— powdery mildew, stem canker, black spot, but newer Alandscape@ roses and old “shrub” roses often more disease resistantC it is important to select for disease resistance when using roses for low-maintenance landscaping

·         also, japanese beetle favors rose foliage and can be a serious pest, as well as aphids and spider mites

·         overall, some of “lowest maintenance” roses currently are in a group called ‘Meidiland’ roses and are the best choice for general landscaping without all the work required for the show roses

·         also cultivars ‘Knockout’ and ‘Nearly Wild’ are two other very disease resistant landscape shrub roses

·         medium to fast growth rate, depending on species/cultivar