Bloomipedia
London rocket (Sisymbrium irio)
Photo: Joseph Rojas via iNaturalist · CC BY 4.0 · resized

Flower profile

London rocket

Sisymbrium irio

Not native to Arizona

London rocket is a wildflower that USDA PLANTS lists as introduced in the lower 48 states. In Arizona it's most often seen in bloom in January–December.

16states
2,301AZ sightings*
5,915U.S. sightings*

*iNaturalist research-grade observations, as of October 17, 2026.

On our lists for: Arizona

Quick look

Sisymbrium irio, London rocket, is a flowering plant in the cabbage family. Its English common name originated when it flourished after the Great Fire of London in 1666, although it is not native to Britain and it does not tend to persist there.

  • It belongs to the Brassicaceae family. iNaturalist
  • USDA PLANTS describes it as an herb (forb) with a annual life cycle. USDA PLANTS
  • USDA PLANTS lists it as introduced in the lower 48 states and records it in 16 states. USDA PLANTS
  • NatureServe lists it as not native to Arizona. NatureServe
  • In Arizona, most iNaturalist sightings of it in flower come in January–December. iNaturalist
  • iNaturalist has 2,301 research-grade sightings of it in Arizona, ranking #40 among the 109 flowers on our Arizona list. iNaturalist

London rocket gift ideas

Handmade london rocket gifts from independent makers.

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When does it bloom?

In Arizona, most flowering sightings come in January–December.

Flowering records by month in Arizona (iNaturalist research-grade observations marked “Flowering”) (89 records)

Conservation status

Federal (U.S. ESA)
Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. USFWS ECOS
NatureServe global
GNR Not yet ranked worldwide. NatureServe
Arizona
Not listed Not on Arizona Native Plant Law protected plants (Ariz. Admin. Code R3-3 Art. 11, App. A, eff. Feb. 2, 2025). NatureServe: SNA, not applicable (usually because it isn't native there) in Arizona. AAC R3-3 App. A
Rare elsewhere
No other U.S. state ranks it S1, S2, SH or SX.

Checked October 17, 2026. Rankings and lists can change, so follow the links for the latest.

Can you eat it?

For peopleEdible (per NC State Extension)

NC State Extension notes: “The flowers, seed and leaves can be eaten.” NC State Extension

For petsNot well documented

It isn't on the ASPCA plant list, and NC State Extension doesn't flag it for pets.

🌿 Never eat a wild plant unless you're certain of its ID; this isn't medical advice. Worried about a person? Call Poison Control at 1-800-222-1222. Worried about a pet? Call your vet.

Where does it grow?

USDA PLANTS records london rocket in 16 states.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

Arizona, California, Colorado, Connecticut, Florida, Hawaii, Massachusetts, Michigan, Nevada, New Mexico, New York, Ohio, Pennsylvania, South Carolina, Texas, Utah.

Arizona counties with USDA records: Cochise, Coconino, Gila, Graham, La Paz, Maricopa, Mohave, Pima, Pinal, Santa Cruz, Yavapai, Yuma.

More Arizona flowers

Saharan mustard (Brassica tournefortii)

Saharan mustard

Brassica tournefortii

Introduced

🌼 Blooms in AZ: January–April
Saguaro (Carnegiea gigantea)

Saguaro

Carnegiea gigantea

★ AZ state flowerNative

🌼 Blooms in AZ: April–June
Creosote bush (Larrea tridentata)

Creosote bush

Larrea tridentata

Native

🌼 Blooms in AZ: January–December

Sources