Green Ash
Green ash is a large, native, deciduous tree with upright branches, spreading form and irregular crown. Shiny medium green leaves turn yellow to orange in the fall. Seeds are paper brown samaras.
Green ash was once a highly recommended tree. Due to the presence of the emerald ash borer in Colorado, tree care professionals are no longer recommending ash trees be planted in Colorado.
'Marshal' is a seedless cultivar with darker green leaves tuning yellow in fall, and bark that creates a diamond pattern up the trunk. 'Cimmaron' is also seedless with a more upright and columnar shape, glossy green leaves turn to reddish purple in the fall.
Green Ash
Green ash is a large, native, deciduous tree with upright branches, spreading form and irregular crown. Shiny medium green leaves turn yellow to orange in the fall. Seeds are paper brown samaras.
Green ash was once a highly recommended tree. Due to the presence of the emerald ash borer in Colorado, tree care professionals are no longer recommending ash trees be planted in Colorado.
'Marshal' is a seedless cultivar with darker green leaves tuning yellow in fall, and bark that creates a diamond pattern up the trunk. 'Cimmaron' is also seedless with a more upright and columnar shape, glossy green leaves turn to reddish purple in the fall.
Plant details
Botanic Name
Fraxinus pennsylvanica
Pronunciation
FRAK-si-nus pen-sil-VAN-ih-kuh
Mature Height
50 to 60 ft.
Mature Spread
25 to 30 ft.
Water usage
One Droplet: Water twice per month or less, once established.
Two Droplets: Water about once per week, once established.
Three Droplets: Water about twice per week, once established.
Flower Color
green-yellow
Bloom time
inconspicuous
Colorado Native
Yes
Natural Habitat
North America
Light Requirements
sun
Cold Hardiness
USDA zones 3-9
Elevation Limit
hardy to 8,000 ft.
Performance
This is a widely planted tree in the Colorado Springs area, including the Water Wise Demonstration Garden where they have proven to be good shade trees.
For many years, 'Marshall,' 'Cimmaron,' or other seedless cultivars were recommended for new plantings to eliminate the annoyance of self seeding. A mature seeded ash can produce thousands of seedlings on an annual basis.
Maintenance
Prune when young to achieve a structurally sound tree. For existing trees, protect them from emerald ash borer once the insect is found within a 50 mile radius. It is currently limited to the northern Colorado area.
See in a landscape
Xeriscape is notzero-scape. Even if you'd like to use rock mulch for your yard, there are plenty of plants that grow well with the extra heat. Rock mulch can be great for areas with high winds where wood mulch may not stay put. Rock is used throughout this landscape, and is planted with trees, shrubs and perennials that can tolerate the extra heat. This yard has a slight slope, so a small rock wall was installed in order to flatten out the planting area near the front door. This also helps add dimension and break up the large space.