Zone 6 Trees

Vitex agnus-castus

Chaste Tree

Family Verbenaceae

SelecTree. UFEI. “Vitex agnus-castus Tree Record.” 1995-2022. Cal Poly State University, San Luis Obispo. Accessed on Jul 19, 2022.
< https://selectree.calpoly.edu/tree-detail/1464 >

Site Conditions

  • Planting area: 2’ – 5’ 
  • Root Damage Potential: Low
  • SelecTree Water Use: Low
  • USDA zones: 6, 7, 8, 9, 10
  • Sun exposure: Partial Shade to Full Sun
  • Soil texture: Loam, Sand, or Clay
  • Soil pH: Very Acidic to Very Alkaline
  • Soil salinity tolerance: Good Inland 
  • Powerline friendly: Yes

Tree Characteristics

  • Tree Shape: Rounded
  • Foliage type: Deciduous
  • Maximum height: 15 feet
  • Canopy width: 15-20 feet
  • Growth rate: ~24 in/year
  • Flowers: Showy, Fragrant
  • Flower color: Blue or Lavender
  • Flowering: Summer or Fall
  • Fruit: Small Black Drupe
  • Fruiting: Summer or Fall 
  • Litter: Dry Fruit

Site Consideration 

Streetscape, Screen, and Tree Specimen

Parkinsonia x ‘Desert Museum’

Desert Museum Palo Verde

Family Fabaceae

Photos taken at Pasadena, CA, Huntington Botanical Gardens – San Marino, CA, Cal Poly – San Luis Obispo, CA and UC Davis, Davis, CA by M. Ritter, J. Reimer

Site Conditions

  • Planting area: 2’ – 5’ 
  • Root Damage Potential: Low
  • SelecTree Water Use: Very Low
  • USDA zones: 6, 7, 8, 9
  • Sun exposure: Full Sun
  • Soil texture: Loam, Sand, or Clay
  • Soil pH: Neutral to Very Alkaline
  • Soil salinity tolerance: Inland Good 
  • Powerline friendly: Yes

Tree Characteristics

  • Tree Shape: Rounded
  • Foliage type: Deciduous
  • Maximum height: 20 feet
  • Canopy width: 20-25 feet
  • Growth rate: ~24-36 in/year
  • Flowers: Showy, Fragrant
  • Flower color: Yellow
  • Flowering: Spring or Summer
  • Fruit: Large Brown Legume
  • Fruiting: Fall 
  • Litter: Dry Fruit

Site Consideration 

Streetscape, Screen, and Tree Specimen

Tilia cordata

Littleleaf Linden

Family Tiliaceae

http://selectree.calpoly.edu/tree-detail/1408#:~:text=Photos%20taken%20at,Mark%2C%20J.%20Reimer

Site Conditions

  • Planting area: 10’ 
  • Root Damage Potential: Moderate
  • SelecTree Water Use: Medium
  • USDA zones: 4, 5, 6, 7, 8
  • Sun exposure: Partial Shade to Full Sun
  • Soil texture: Loam, Sand, or Clay
  • Soil pH: Very Acidic to Slightly Alkaline
  • Soil salinity tolerance: Moderate
  • Powerline friendly: No

Tree Characteristics

  • Tree Shape: Rounded
  • Foliage type: Deciduous
  • Maximum height: 60 feet
  • Canopy width: 15-30 feet
  • Growth rate: ~12-24 in/year
  • Flowers: Showy, Fragrant
  • Flowering: Summer
  • Fruiting: Fall 
  • Litter: Small Dry Fruit

Site Consideration 

Streetscape, Tree Specimen, Parkland

Catalpa speciosa

Northern Catalpa

Family Bignoniaceae

Photos taken at National Arboretum – Washington, D.C., Los Angeles County Arboretum – Arcadia, CA, by M. Ritter, W. Mark, J. Reimer

Site Conditions

  • Planting area: < 10’
  • Root Damage Potential : Moderate
  • SelecTree Water Use: Medium
  • USDA zones: 4, 5, 6, 7, 8
  • Sun exposure: Full Shade to Full Sun
  • Soil texture: Loam, Sand, or Clay
  • Soil pH: Very Acidic to Very Alkaline
  • Soil salinity tolerance: Moderate Inland
  • Powerline friendly: No

Tree Characteristics

  • Tree Shape: Rounded
  • Foliage type: Deciduous
  • Maximum height: 60 feet
  • Canopy width: 20-40 feet
  • Growth rate: ~24-36 in/year
  • Flowers: Showy
  • Flowering: Summer
  • Fruit: Large Brown Capsule
  • Fruiting: Fall
  • Litter: Dry Fruit

Site Consideration 

Streetscape, Parkland, Tree Specimen

Parrotia persica

Persian Ironwood

Family Hamamelidaceae

Photos taken at Dallas Arboretum – Dallas, TX, Los Angeles County Arboretum – Arcadia, CA, Strybing Arboretum – San Francisco, CA, San Luis Obispo, CA, Hoyt Arboretum – Portland, OR, Finch Arboretum – Spokane, WA and The National Arboretum – Washington, DC by M. Ritter, C. Stubler, W. Mark, J. Reimer

Site Conditions

  • Planting area: 5’ to 10’ 
  • Root Damage Potential : Moderate
  • SelecTree Water Use: Medium
  • USDA zones: 4, 5, 6, 7
  • Sun exposure: Partial Shade to Full Sun
  • Soil texture: Loam or Sand
  • Soil pH: Acidic to Neutral
  • Soil salinity tolerance: Moderate
  • Powerline friendly: No

Tree Characteristics

  • Tree Shape: Rounded
  • Foliage type: Deciduous
  • Maximum height: 35 feet
  • Canopy width: 15-35 feet
  • Growth rate: ~12-24 in/year
  • Flowers: Showy
  • Flower color: Red
  • Flowering: Spring
  • Fruit: Medium Capsule
  • Fruiting: Summer or Fall
  • Litter: Fruit

Site Consideration 

Screen, Streetscape, Tree Specimen

Cotinus coggygria

Smoke Tree

Family Anacardiaceae

Photos taken at Cal Poly State University – San Luis Obispo, CA, The National Arboretum – Washington, DC and Finch Arboretum – Spokane, WA by M. Ritter, W. Mark, J. Reimer

Site Conditions

  • Planting area: 2’ – 5’ 
  • Root Damage Potential: Low
  • SelecTree Water Use: Low
  • USDA zones: 5, 6, 7, 8
  • Sun exposure: Partial Shade to Full Sun
  • Soil texture: Loam, Sand
  • Soil pH: Very Acidic to Very Alkaline
  • Soil salinity tolerance:Moderate Inland
  • Powerline friendly: Yes

Tree Characteristics

  • Tree Shape: Rounded
  • Foliage type: Deciduous
  • Maximum height: 15 feet
  • Canopy width: 10 – 18 feet
  • Growth rate: ~24 in/year
  • Flowers: Showy
  • Flower color: Purple
  • Flowering: Spring 
  • Fruit: Very Small Pink Drupe
  • Fruiting: Summer 
  • Litter: Dry Fruit

Site Consideration 

Streetscape, Screen, and Tree Specimen

Abies concolor

White Fir

Family Pinaceae

Photos taken at Kwantlen Polytechnic University, Langley, B.C., Grand Canyon, AZ, Red Butte Garden – Salt Lake City, UT, Regional Parks Botanic Garden, Tilden Regional Park – Berkeley, CA, Finch Arboretum – Spokane, WA and Hoyt Arboretum – Portland, OR by Blake Willson – TreeLib.ca, M. Ritter, W. Mark, J. Reimer

Site Conditions

  • Planting area: 10’ 
  • Root Damage Potential : Moderate
  • SelecTree Water Use:  Low
  • USDA zones: 5, 6, 7
  • Sun exposure: Partial Shade to Full Sun
  • Soil texture: Loam, Sand, or Clay
  • Soil pH: Very Acidic to Neutral
  • Salt spray tolerance: Moderate 
  • Powerline friendly: No

Tree Characteristics

  • Tree Shape: Conical
  • Foliage type: Evergreen
  • Maximum height: 50 feet
  • Canopy width: 15-25 feet
  • Growth rate: ~12-24 in/year
  • Flowers: Fragrant
  • Flowering: Spring 
  • Fruit: Large Purple Cone
  • Fruiting: Fall or Winter
  • Litter: Dry Fruit

Site Consideration 

Parkland, Wildland, Tree Specimen

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