Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 3 accessions of Cirsium hydrophilum var. hydrophilum in orthodox seed collection. There are as many as 1175 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.
Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 1 seed accessions of Cirsium hydrophilum var. hydrophilum from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants
habitat conversion, water pollution, changes in salinity, indirect effects of urbanization, stochastic events, mosquito abatement activities (including off-road vehicle use), competition with non-native vegetation, regulatory mechanisms, and other
a few thousand individuals
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