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Hypericum canariense Introductions...


H. canariense has made its way to North America and other parts of the world as a relatively rare horticultural offering. It is currently displayed at both the Los Angeles County Arboretum and the Missouri Botanical Gardens, and it continues to appear for sale on occasion.

It has escaped ornamental planting in a variety of areas...

Santa Barbara, CA
Orange County, CA
San Diego, CA
San Mateo County, CA
San Francisco, CA
Kula (Maui), HI
Western Australia
Victoria (Australia)
New Zealand (no info yet)
Beyond
Eradication Efforts/Techniques

See the Contacts page for a list of people involved in following and eradicating this species at each site.

Return to the Hypericum canariense Home Page


Santa Barbara, CA
H. canariense
was first reported in the wild in the Santa Barbara, CA area (Munz 1968), where it appeared to be escaping from gardens (Smith 1976).  In 2001, KM Dlugosch was not able to relocate it there, but recently it has been reported again, at Ortega Hill Rd near Highway 101 (David Chang, Agricultural Commissioner's Office):

SB1
H. canariense (yellow-green) near Santa Barbara.
(Photo courtesy of D. Change - 2010)
SB2
H. canariense near Santa Barbara.
(Photo courtesy of D. Change - 2010)

Munz, P. (1968). Supplement to A California Flora. Berkeley, University of California Press.
Smith, C. (1976). A flora of the Santa Barbara region, California: an annotated catalogue of the native and naturalized plants of the Santa Barbara County mainland and nearby Channel Islands. Santa Barbara, Santa Barbara Museum of Natural History.


Orange County, CA
H. canariense covers about an acre on the historic Dana Point headlands and several acres in San Juan Capistrano. It was vouchered at both localities in the mid-1980's, though it has been noted anecdotally as being in San Juan Capistrano since at least the early 1970's. It appears not to be spreading in Dana Point but is spreading widely in San Juan Capistrano.



A large H. canariense in Lake Murray Park.
San Diego, CA
Within the city of San Diego, approximately three patches of H. canariense cover several ha of coastal scrub at the Pt. Loma Naval base. This invasion is likely to have begun within the last twenty years (Calflora database). I have also seen several additional patches of H. canariense in the San Diego area, residing in areas of coastal scrub habitat of Tecolote Canyon, Balboa Park, and Lake Murray Park.

San Mateo County, CA
In San Mateo Co., near Franklin Point on the central California coast, H. canariense occurs in many dense patches, as well as sporadic individuals, over about 100 ha of coastal scrub and old fields. This invasion may have started as much as fifteen years ago, but has increased rapidly during the last five years.


H. canariense (yellow)in San Mateo Co.
(Photo by J. Wade - Summer 2001)

Aerial photo of one portion of the H. canariense (orange)
invasion in San Mateo. (Photo by J. Wade - Summer 2001)

For more images of this invasion, see the website www.hear.org/species/hypericum_canariense/johnwadeimages


San Francisco, CA
A small population of this species (unconfirmed) is was treated with herbicides on Angel Island in San Francisco Bay in 2006.



Undergraduate technician Jodi Stewart climbing
H. canariense shrubs at Kula. (Summer 2003)
Kula, Maui (Hawai'i)
H. canariense is also invading the Kula area (rangeland, 1300m) on the island of Maui, HI. It has been spreading away from an initial introduction near what is now Kula Botanical Gardens for approx. 20 years (pre-dating the gardens).

The HEAR (Hawaiian Ecosystems At Risk) website has additional general and detailed information about this invasion, including maps and photos.


Western Australia
One coastal population has been identified here, about 300 km south of Perth, in the Bremer Bay/Gairdner area (East of Albany). Eradication has been planned (update required).
This population has been documented at the Western Australian herbarium by specimens:
PERTH 05588499 (specimen from Bridgetown)
PERTH 05952999 (specimen from Bremer Bay)


Victoria, Australia
Recently, H. canariense has been documented in coastal Victoria.

Beyond

While these locations are few, this species has been successful at spreading into natural, undisturbed vegetation, and appears likely to increase its range substantially in the immediate future. Its native range falls within the Mediterranean climate zone, and similar habitat also occurs in Pacific North America, Chile, New Zealand, Australia, and South Africa. The Nature Conservancy has posted H. canariense on its Weed Alert list.


Eradication Efforts

H. canariense will re-sprout if cut to the ground, and there is no primary stem suitable for a weed wrench. Thus far, eradication has been attempted via herbicide sprays. In Hawai'i, control of H.canariense has been attempted using the herbicide triclopyr ester (brand name Garlon 4). It is susceptible to foliar treatment, but seasonally may not have enough leaf surface available for uptake. It seems, at least in Hawai'i, that it is quite susceptible to basal bark treatments at any time of year (20% Garlon 4 in oil carrier).

(See the Contacts page for a list of people involved in following and eradicating this species at each site).


This page last updated: October 2014

This page is maintained by Katrina Dlugosch, University of Arizona.