Wild Mustard. Sisymbrium irio, Mustard Family: ( Cruciferae ), Wild Mustard. Also called: London Rocket. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. London Rocket is an introduced annual weed originating from Europe. It may have come from the Mediteranian or Britain. The small flowers are pale-yellow and bloom from December to May. London Rocket has been moved into the Cruciferae family from the Brassicaceae family. Quick Notes: Height: Up to about 36 inches. Spreading out to about 22 inches wide. Flowers: Flowers occur in a cluster on top of long green stem. They are yellow to about 1/8" long with 4 petals. Flower Stalk: The flower stalk is about 18" - 30" long, smooth, and dark green. Flowering Time: Mid December - May. Seed Pods: Up to 2" long, slender, seed pods. Leaves: The leaves are simple, lobed, fleshy, up to about 8" long. Found: Native of Europe. It may have come from the Mediteranian or Britain. Hardiness: USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) 8.6 to 9.0 (strongly alkaline) Sun Exposure: Full Sun Sun to Partial Shade Light Shade Elevation: 0 - 4,865 Feet. Habitat: Alkaline, well-drained/light soils. Washes in the desert environs, Irrigated fields, moist fallow fields, roadsides. Miscellaneous: Flowering Photos Taken March 29, 2003. Glendale, Arizona.

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