I have a fruit question that no one here in California can answer – are the berries of Berberis (Mahonia lomariifolia) edible? We have two plants. They are very attractive throughout the year with sprays of yellow blooms and prolific clusters of blue berries which are full of juice and flavour. We have sampled a few with no ill effects and I have collected the berries and they are in the freezer. Plenty to make jam. However if they contain any toxins, they might not be good to eat in any concentration.
I have checked on the internet and tried many sources including Cornell, UC Davis, Berkeley Botanical Garden, where we bought the last one, but no information. I would like to know if they can be safely eaten in quantity, such as in jam.