Methods to control blackberry thickets: Oregon State University Extension Service. "...the western European blackberry that Luther Burbank introduced in 1885 as 'Himalayan giant' has become a giant problem. ..."
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 03/29/2025).
one or more occurrences