![]() Does the pH of Tap Water Affect your Landscape?.For more information about our business and our servi ces, click here. This is the official blog of Outdoor Design Group, Colorado Landscape Architects. Glossy, dark green foliage changes to yellow in the fall and is resistant to elm leaf beetle feeding. Ulmus japonica x wilsoniana ‘Morton’ – Accolade Elm Ht: 70’ Wd: 60’Īrching limbs and a graceful vase shape (similar to the American elm) characterize this hybrid elm selected and tested at Morton Arboretum. Handsome, deeply corrugated leaves emerge coppery-bronze and mature to glossy green. Grown from seed collected in China, this sturdy, upright-growing elm was selected for superior performance on the hot, arid, windswept plains of western Oklahoma. Ulmus propinqua ‘JFS-Bieberich’ – Emerald Sunshine Elm Ht: 35’ Wd: 25’ Ulmus davidiana – David Elm Ht: 40’ Wd: 30’ Similar to Crimson Spire, but does not hold brown foliage through the winter Turning red in autumn, they fall to reveal stiffly upright branches. Quercus robur x alba ‘JFS-KW1QX’ – Streetspire Oak Ht: 45’ Wd: 14’ĭark green leaves of this narrowly columnar tree are mildew resistant. Quercus muehlenbergii – Chinkapin Oak Ht: 40’ Wd: 40’Ī durable and adaptable oak with narrow lustrous glossy dark green leaves and an open, irregular, rounded habit. ![]() This variety is more resistant to the galls that can affect other Bur Oaks. This large oak sports a massive trunk, deeply furrowed, that supports corky ridged twigs on spreading branches that makes for a broad and rounded canopy. ![]() Quercus macrocarpa ’Bullet Proof’ – Bullet Proof Bur Oak Ht: 50-80’ Wd: 50-80’ More upright than the popular Hot Wings Tatarian maple. This maple provides red fall color, but unlike a red maple like Autumn Blaze (Acer x freemanii), the sugar maples are more adapted to the alkaline soils of Colorado’s Front Range urban corridor.Īcer tataricum ‘JFS-KW2’ – Rugged Charm Maple Ht: 28’ Wd: 15’Ĭompact oval form. ![]() Very adaptable.Īcer saccharum ‘Collins Caddo’ – Collins Caddo Sugar Maple Ht: 45’ Wd: 40’ Rough corky bark and leaf shape are similar to Hedge Maple, but its stronger growth rate and ascending branch habit result in a larger mature size. Once established, the bigtooth maples are drought tolerant.Īcer miyabei ‘Morton’ – State Street Maple Ht: 50’ Wd: 35’ The Manzano is a more tree like form of bigtooth maple. Large shrub or small tree with rounded form. Here are ten trees that were discussed at the conference (out of many others) that you might consider planting in Colorado and the surrounding region:Īcer grandidentatum ‘Manzano’ – Manzano Bigtooth Maple Ht: 20-30’ Wd: 20-30’ While most elms have been looked over because of Dutch Elm Disease and also the invasive nature of Siberian Elm ( Ulmus pulmila), there are a few cultivars that we should consider planting in Denver. The other genus with multiple species that should get wider consideration for planting in our area is Ulmus (elms). Several new tree species were presented to the audience, along with some old stand-bys, with a discussion of each tree’s merits.Īlthough there were several genera that are represented in the group of trees, the two genera with the most candidates are Maples and Oaks. This year’s conference was the second occurrence of such a gathering in Denver. What far-flung exotic pest will next appear in our area? That is the most probable scenario of how EAB was found in Boulder: it was brought there in a wooden crate shipped from Asia. Also, biotic mixing will continue to increase as more people move goods and materials far and wide across the globe. As climate scientists continue to inform us, it is likely that Colorado’s climate will get warmer and drier, providing even more challenging growing conditions for trees. There are other reasons to seek out trees better adapted to our climate. It seems recent crises such as the discovery of Emerald Ash Borer infestation in Boulder has revealed the urgency for members of the Green Industry to seek out more hardy and appropriate tree species for our region. This past Spring, tree enthusiasts from around the region gathered at the Denver Botanic Gardens to listen and learn from various presenters on the theme of Tree Diversity for Colorado. Attendees in the lobby of the Denver Botanic Gardens where the Tree Diversity Conference was held.
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