Weeds - Goulburn Broken Catchment Management Authority

Hypericum perforatum
(Goatweed, Klamath Weed)
Regionally Controlled Weed
St John’s Wort
Description: An erect herb 80-120 cm tall.
flowers: Bright yellow, 2-2.5 cm wide with 5 petals. In
clusters at the end of upper branches. Tiny black dots along
margins. Occurring between late Spring and Summer.
fruit: 3-celled capsule, 5-10 mm long with many seeds.
leaves: Green, lighter underneath in opposite pairs
1.5-3 cm long. Numerous small oil glands give a perforated
appearance when the leaf if held up to the light.
stems: Several woody, reddish, with two ridges and dark
glands. Branched towards the top.
Note: May cause “photosensitisation” in stock.
similar Native species: Could be confused with native
Hypericum species, such as Matted St. John’s wort (H.
japonicum) or Small St. John’s wort (H. gramineum).
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