Idaho State Flower: Syringa

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Researched by USA Symbol Team

Fact-checked • Updated December 10, 2025

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🌸 State Flower of Idaho

Idaho State Flower – Syringa

Idaho made the Syringa its official state flower in 1931. This white flowering shrub grows wild throughout Idaho's canyons and mountainsides. The Syringa produces clusters of fragrant blossoms each spring across the state's diverse landscapes.

Official Symbol Since 1931 Philadelphus lewisii
Syringa

What Is the Idaho State Flower?

Official since 1931, the Syringa represents Idaho. Each flower displays four white petals arranged in a simple cross shape. The blooms measure about 1 to 2 inches across. Flowers grow in loose clusters containing 5 to 15 individual blossoms. A sweet fragrance similar to orange blossoms fills the air during peak blooming.

Syringa shrubs bloom from late May through July across Idaho. Lower elevations see earlier blooms than mountain areas. Peak flowering occurs in June throughout most of the state. The shrub reaches heights of 3 to 10 feet. Multiple stems arch outward from the base. The plant produces oval leaves with smooth edges that turn yellow in fall.

This native shrub grows wild in canyons, along streams, and on mountain slopes. Idaho's forests and foothills provide ideal habitat. The plant tolerates dry conditions once established. Well-drained soil suits Syringa best. The shrub grows from sea level to elevations around 7,000 feet across Idaho's varied terrain.

Idaho State Flower Name

Known as Syringa, this flower's scientific designation is Philadelphus lewisii. The plant belongs to the Hydrangeaceae family. This family includes hydrangeas and mock oranges along with about 170 species of flowering shrubs worldwide.

The genus name Philadelphus means brotherly love in Greek. The species name lewisii honors Meriwether Lewis of the Lewis and Clark Expedition. Lewis collected specimens of this shrub during the expedition's journey through Idaho in 1806. He recognized it as a new species and preserved samples for scientific study.

People commonly call this plant mock orange because its fragrance resembles orange blossoms. Idaho residents typically use the name Syringa. Some confusion exists because true syringa refers to lilac bushes. Idaho's Syringa is not related to lilacs despite sharing the common name. The scientific name Philadelphus lewisii avoids this confusion.

How Idaho Chose the Syringa

Idaho's legislature declared the Syringa the official state flower in 1931. A statewide vote among school children preceded the official designation. Students throughout Idaho participated in selecting their favorite native flower. The Syringa won this vote by a clear margin over competing flowers.

Idaho wanted a native flower that grew abundantly throughout the state. The Syringa met this requirement perfectly. Native Americans had used the shrub's wood for arrow shafts and other tools. Early settlers admired the fragrant blooms. The connection to Lewis and Clark added historical significance.

Women's clubs and garden societies supported the Syringa selection. They promoted native plants over imported garden flowers. The legislature received the children's vote results and quickly passed the designation. No significant opposition emerged during the process. Idaho formalized the Syringa as state flower on February 5, 1931.

Idaho State Flower Facts

Fact 1 of 6

The Syringa grows naturally from British Columbia south through Idaho to northern California, thriving in mountainous regions of the Pacific Northwest

Idaho State Flower and Bird

The Mountain Bluebird serves as Idaho's state bird, a small songbird with brilliant blue plumage. Both symbols represent Idaho officially. Idaho adopted the Syringa in 1931 and designated the Mountain Bluebird as state bird in 1931 during the same legislative session.

Both are official state symbols of Idaho.

What the Syringa Symbolizes

The Syringa commonly represents Idaho's pioneer heritage and connection to western exploration. The flower has been linked to the Lewis and Clark Expedition's historic journey through Idaho territory. Its hardy nature frequently represents the resilience of Idaho's early settlers who established communities in challenging terrain.

Sources & References

This article has been researched using authoritative sources to ensure accuracy and reliability. All information has been fact-checked and verified against official government records and botanical databases.

1
Idaho State Legislature
https://legislature.idaho.gov/

Official source for Idaho state symbols and legislation • Accessed: December 31, 2025

2
University of Idaho Extension
https://www.uidaho.edu/

Information about Idaho's native plants and natural resources • Accessed: December 31, 2025

3
Idaho Native Plant Society
https://idahonativeplants.org/

Resources on Idaho's native flora and plant conservation • Accessed: December 31, 2025

Accuracy Commitment: We strive to maintain accurate and up-to-date information. If you notice any errors or outdated information, please contact us.

Other Idaho Symbols

People Also Ask

What is Idaho's state flower?
Idaho's state flower is the Syringa, a white flowering shrub with fragrant blossoms that grows wild throughout the state's canyons and mountains.
When did Idaho adopt the Syringa as its state flower?
Idaho adopted the Syringa on February 5, 1931. The designation followed a statewide vote by school children who selected it as their favorite native flower.
Why did Idaho choose the Syringa?
Idaho chose the Syringa because it grows abundantly throughout the state and is native to Idaho. The connection to Meriwether Lewis who collected specimens during the Lewis and Clark Expedition added historical significance. School children voted for it over competing native flowers.
Is the Syringa the same as lilac?
No, Idaho's Syringa is not related to lilac bushes despite sharing the common name. True syringa refers to lilacs which belong to a different plant family. Idaho's Syringa is a mock orange with the scientific name Philadelphus lewisii.
When does the Syringa bloom in Idaho?
The Syringa blooms from late May through July in Idaho, with peak flowering occurring in June. Lower elevations see earlier blooms than mountain areas where the shrub grows at elevations up to 7,000 feet.