Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban...
Transcript of Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban...
![Page 1: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/1.jpg)
1
Tree Selection for Urban CommunitiesNatives, Exotics, and Common Sense
Bert CreggMichigan State UniversityDepartment of Horticulture
Department of Forestry
Ashes made up 25% or more of the tree cover in many SE Michigan communities
• Why did we plant so many ashes?– Easy to grow– Desirable ornamental characteristics– Tough trees– Few pest problems
Common environmental stresses
• Temperature– Heat– Cold
![Page 2: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/2.jpg)
2
Common environmental stresses
• Water– Flooding– Drought
• Chemical exposure– De-icing Salt– Pollution
Common environmental stresses
Common environmental stresses
• Adverse soil conditions– Alkaline pH– Loss of topsoil– Poor drainage
Common environmental stresses
• Adverse soil conditions– Alkaline pH– Loss of topsoil– Poor drainage
![Page 3: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/3.jpg)
3
Generalizations about environmental factors
and tree selection
• Tolerance of minimum winter temperature is the single biggest determinant of whether a tree will grow in a given location
Generalizations about environmental factors
and tree selection• Trees adapted to wet areas (i.e., flood
plain species) can usually tolerate some level of drought
• Trees adapted to uplands may not be able to tolerate any flooding
Cold hardiness
Poor soil conditions
Salt exposure
Urban heat island
Why not just plant natives?
• Native environmental conditions no longer exist in urban and suburban areas
• Exotic pests• Production system/transplanting issues• Still need diversity
![Page 4: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/4.jpg)
4
So where does this leave us? Right tree, Right place
• Hardiness• Soil conditions• Pest resistance• Exposure• Height/growth limitations• Diversity• Native
Selecting a diversified portfolio Freeman mapleAcer × freemanii
• Zone 3• Height: 50’• Broadly oval crown• Dark green leaves• Long lasting fall color
![Page 5: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/5.jpg)
5
State street mapleAcer miyabi‘State street’
• Hardy to zone 4• Upright –oval• 40’-50’
State street mapleAcer miyabi ‘State street’
Red horsechestnutAesculus × carnea
• Zone 4• Height 30’• Spread 35’• Flowers dark red,
10” long clusters
Red horsechestnutAesculus × carnea
![Page 6: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/6.jpg)
6
HackberryCeltis occidentalis
• 40’-60’• Zone 3-9• Grows well under adverse
conditions
Turkish filbertCorylus colurna
• Zone 4• Height 45’• Pyramidal• Dark green foliage
Dawn redwoodMetasequoia glyprostraboides
• Zone 5• Height: 75’• Narrow conical• Rusty red fall color
![Page 7: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/7.jpg)
7
Dawn redwoodMetasequoia glyprostraboides
BaldcypressTaxodium distichum
• Zone 5• Height 55’• Pyramidal• Coarser branch
structure than dawn redwood
Kentucky coffeetreeGymnocladus dioicus
![Page 8: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/8.jpg)
8
SweetgumLiquidambar styraciflua
• Medium to fast growing tree
• Fruit can be messy• Cultivars to look
for:– 'Worplesdon’– ‘Urbanite
Swamp white oakQuercus bicolor
Scarlet oakQuercus coccinea
• Zone 4• 50’• Dark green, glossy foliage• Deep red fall color
![Page 9: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/9.jpg)
9
Black tupeloNyssa sylvatica
![Page 10: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/10.jpg)
10
![Page 11: Tree Selection for Urban Communities Natives, Exotics, and ... · Tree Selection for Urban Communities Natives, Exotics, and Common Sense Bert Cregg Michigan State University Department](https://reader033.fdocuments.us/reader033/viewer/2022042323/5f0d6f667e708231d43a574f/html5/thumbnails/11.jpg)
11
Questions?Comments?