There is a native Barberry (Berberis Canadensis) but in most places it is not seen as commonly as Japanese Barberry. The berries and leaves are edible. The taste of the berries is interesting. The leaves can also be eaten cooked, but it's deciduous so they fall off before winter.
Also asked, what is a substitute for barberries?
You can also substitute chopped dried sour cherries (like the ones from Trader Joe's) or currants soaked in a bit of lemon juice, write Ottolenghi and Tamimi in Jerusalem: A Cookbook. There are four dishes in the book that feature barberries – two are main dishes and and two are sides.
What do barberries taste like?
The oblong berries (about 1/2 inch /1 cm long) grow in clusters and ripen to red and have a tart taste. In the Middle East and parts of Asia, the berries are dried and used as a dried fruit in cooking. One variety, Darwin, is reputedly sweet enough to eat out of hand.
What is Barberry tea?
Barberry is available in capsules, fluid extracts, tinctures and as a topical ointment. The dried roots can also be used in tea, and its extracts are standardized to contain 8 percent to 12 percent alkaloids (berberine).