April May 2018

19 colorad o nga.org LooseLeaf April/May 2018 Tilcce cordata  ‘Corzam’ – Corinthian Linden This clone of Littleleaf Linden is the narrowest of the Littleleaf cultivars. It has smaller, thick, deep green leaves giving it a finer texture. The fall color is a good yellow. The white fragrant flowers are loved by bees, and bright green bracts contrast nicely with the dark green leaves. It is hardy to zone 3, and mature to about 40 feet in height and 10 to 15 feet in width. It can have aphid and Japanese beetle problems. Syringa reticulata  ‘Bailnce’ PP20458 – First Editions Snowdance Lilac This tree lilac is excellent as a smaller, single-stem tree with dark green leaves. It has very large white panicle flowers in June into July. It has a more upright, spreading growth habit, maturing to about 15 to 20 feet tall and 15 to 20 feet wide. It is hardy to zone 4, and the large plumes of small white flowers smother the branches in early summer. Syringa reticulata  spp. Pekinensis – Pekin Lilac This lilac can be grown as a single-stem, smaller tree or larger, multi-stem shrub. It has an upright arching habit, which gets more open as it matures. The bark exfoliates and comes off in flakes or sheets, and adds a lot of winter interest. The showy, yellowish-white flowers appear in late May to June. It prefers a sunny location, and is hardy to zone 4, maturing to about 15 feet in height and 10 to 15 feet in width. It appears very adaptable to more alkaline clay soils. A technical bulletin entitled ‘Dependable Landscape Trees’ from the Colorado State University Arboretum is a valuable resource, highlighting many of most dependable trees for the Rocky Mountain area. Recommendations in this bulletin are based on 15 years of data, collected from 1997 to 2012. It is available for $19.95 plus shipping and handling and can be ordered online at csuextstore.com.