Lythrum hyssopifolia

Lythrum hyssopifolium_hyssop loosestrife_ JM Di Tomaso
Photo: Joseph DiTomaso

Synonyms: L. adsurgens, L. hyssopifolium

Common names: hyssop loosestrife; grass poly; hyssop lythrum

Lythrum hyssopifolia (hyssop loosestrife) is a perennial forb/herb (family Lythraceae) that invades wetlands. It occurs in seasonal wetlands, ditches, and cultivated fields, especially rice fields. L. hyssopifolia often grows on exposed mud, tolerates some salinity, but is sensitive to heavy frost.

Cal-IPC Rating: Moderate?

CDFA Rating: None?


Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.

Weed Management Notes

  • Management Notes - Information on management techniques and effectiveness from the University of California Cooperative Extension’s Weed Research & Information Center.

Cal-IPC Newsletter Articles

There are no newsletter articles associated with this species yet.

Cal-IPC Symposium Presentations

Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.

Other Lythrum hyssopifolia Information

  • CalPhotos - Images of plants taken mostly in California.
  • Calflora - Distribution map and records of this species in California.
  • CalWeedMapper - Distribution map of this species in California with ability to determine regional priorities.
  • EDDMapS - Distribution of this species in North America.
  • Jepson Interchange - Information on this plant's taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
  • USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.
  • Additional photos

    Lythrum hyssopifolia_flowers and leaves_copyright2016_NealKramer
    Lythrum hyssopifolia (hyssop loosestrife) flowers and leaves. Photo: &#169 2016 Neal Kramer
    Lythrum hyssopifolia_fruits and leaves_copyright2009_NealKramer
    Lythrum hyssopifolia (hyssop loosestrife) fruits and leaves. Photo: &#169 2009 Neal Kramer
    Lythrum hyssopifolia_seedling_ZoyaAkulova
    Lythrum hyssopifolia (hyssop loosestrife) seedling. Photo: Zoya Akulova
    Lythrum hyssopifolia_growth habit_JeanPawek
    Lythrum hyssopifolia (hyssop loosestrife) growth habit. Photo: Jean Pawek