Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Ceanothus masonii in orthodox seed collection. There are as many as 145 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 Native Plant Society has collected 1 seed accessions of Ceanothus masonii from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 4 maternal plants
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