Botanical Name: Robinia 'Idaho'
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Common Name: Idaho Locust  
Plant photo of: Robinia 'Idaho'
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Water Saving Tip:

Replace turf with groundcovers, trees, and shrubs. If you have areas where no one uses the grass, patches that do not grow well, or a turf area too small to water without runoff, consider replacing the turf with water-efficient landscaping.

  • Anatomy

  • Culture

  • Design

Plant Type

Tree

 

Height Range

25-40'

 

Flower Color

Pink

 

Flower Season

Spring

 

Leaf Color

Light Green

 

Bark Color

Brown

 

Fruit Color

n/a

 

Fruit Season

n/a

Sun

Full

 

Water

Medium

 

Growth Rate

Moderate

 

Soil Type

Sandy, Clay, Loam, Rocky, Unparticular

 

Soil Condition

Average, Poor, Well-drained, Dry

 

Soil pH

Neutral

 

Adverse Factors

Attracts Bees, Thorns/Spines

Design Styles

English Cottage, Mediterranean, Ranch, Spanish, Woodland

 

Accenting Features

Fragrance, Showy Flowers

 

Seasonal Interest

Spring

 

Location Uses

Background, Shrub Border, Parking Strip, Walls / Fences

 

Special Uses

Cut Flowers, Shade Tree

 

Attracts Wildlife

Birds, Hummingbirds

Information by: Stephanie Duer
Photographer: Seatree Nursery/Frommer

  • Description

  • Notes

Idaho Locust is a medium sized tree that grows to about 40 feet tall and 15 to 20 feet wide. Small, light green pinnate leaves turn yellow in autumn. 6 to 8 inch long pendents of rose-pink, fragrant flowers bloom in spring. Idaho Locust has a more open habit than Black Locust, and it has few or no seed pods, but it does have thorns.
Grows best in full sun in well drained soil, though it will tolerate part sun situations. Tolerates high temperatures, poor soils, nitrogen-poor soils, and high pH. It does have a history of breakage in snow storm events in SLC.