20 Plus Trees to Replace Ash in Front Range Landscapes (Note: Not all trees are suitable for all sites) Common (Easier to Find) Cautions: Sensation boxelder (Acer negundo ‘Sensation’) M, T M: Weak-wooded\messy Norway maple (Acer platanoides) W: High water needs Freeman maples- including autumn blaze (Acer x freemanii) S, P S: Not tolerant of alkaline soils Ohio buckeye (Aesculus glabra) P: Potentially overplanted Horsechestnut (Aesculus hippocastanum) Special Consideration: Northern catalpa (Catalpa speciosa) X, T T: At least a moderate tolerance Hackberry (Celtis occidentalis) X, T of salts Honeylocust, thornless (Gleditsia triacanthos inermis) P, X X: Lower water needs Kentucky coffee tree (Gymnocladus dioicus) X, T
Cottonwood, plains (Populus sargentii) W, M Bur oak (Quercus macrocarpa) X, T English oak (Quercus robur) X, T Red oak (Quercus rubra) S American linden (Tilia americana) Littleleaf linden (Tilia cordata) P Redmond linden (Tilia x euchlora)
More Challenging to Acquire and/or Experimental Manzano maple (Acer grandidentatum ‘Manzano’) X Caddo sugar maple (Acer saccharum ‘John Pair’) X Texas buckeye (Aesculus glabra arguta) Yellow Buckeye (Aesculus octandra) European hornbeam (Carpinus betulus) Chinese catalpa (Catalpa ovata) Winter king hawthorn (Crataegus viridis 'Winter King') European beech (Fagus sylvatica) Ginkgo (Ginkgo biloba) Amur cork tree (Phellodendron amurense) Fontaine cherry (Prunus x fontanesiana) Texas red oak (Quercus buckleyi) Swamp white oak (Quercus bicolor) Chinkapin oak (Quercus muehlenbergii) X Shumard Oak (Quercus shumardii) Japanese pagoda tree (Styphnolobium japonicum) Silver linden (Tilia tomentosa) Harvest gold linden (Tilia cordata x mongolica ‘Harvest Gold’) X American elm- potential DED resistant cultivars (Ulmus americana ‘Valley Forge’, ‘Princeton’ and ‘Triumph’) David elm (Ulmus davidiana) Emerald sunshine elm (Ulmus proinqua ‘Emerald Sunshine’) Prospector elm (Ulmus wilsoniana ‘Prospector’) Hybrid elms Zelkova (Zelkova serrata)