Isatis tinctoria
A winter annual, biennial, or short-lived perennial mustard with a 3 to 5 foot deep taproot. Basal rosette with bluish green leaves; stem leaves are lance shaped, alternate, and not stalked; all leaves have a cream-colored mid-vein. Small yellow flowers with 4 sepals, 4 petals, and 6 stamens.
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ODA Listing | |
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Shade Preference | |
Mature Height | 1-4' |
Distribution | According to ODA, There are multiple historic sites scattered throughout Oregon that have been eradicated. Currently, Klamath and Lake Counties have the most infested acres. |
Control | Hand pulling and digging after plant bolts but before seeds are produced, are recommended control options for difficult terrain. Active mowing will control orchard populations. It can be cultivated twice a year for control- once before seed prodcution and a second time in late fall. |
Reproduction and Spread | Reproduces by seed; each plant can produce 350-500 seeds, some produce up to 10,000 seeds. |
Introduced | Native to Russia, introduced to Utah from Ireland in 1910. |
Look Alikes | other mustards, especially yellow or common mustard |
Impact | This allelopathic plant forms dense clolines in rangelands, damages crops, and destroys wildlife habitats. |
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