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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 (Acer platanoides) W: High water needs  Freeman - 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 ( sargentii) W, M  Bur (Quercus macrocarpa) X, T  English oak (Quercus robur) X, T  Red oak (Quercus rubra) S  American linden ()  Littleleaf linden () 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 (Carpinus betulus)  Chinese catalpa (Catalpa ovata)  Winter king hawthorn (Crataegus viridis 'Winter King')  European (Fagus sylvatica)  Ginkgo (Ginkgo biloba)  Amur cork tree (Phellodendron amurense)  Fontaine cherry ( 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 ()  Harvest gold linden (Tilia cordata x mongolica ‘Harvest Gold’) X  American - 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  Zelkova (Zelkova serrata)